diff --git a/Configurations.md b/Configurations.md
index c92be5df010..37cb7474130 100644
--- a/Configurations.md
+++ b/Configurations.md
@@ -17,6 +17,29 @@ To enable unstable options, set `unstable_features = true` in `rustfmt.toml` or
 
 Below you find a detailed visual guide on all the supported configuration options of rustfmt:
 
+## `array_width` 
+
+Maximum width of an array literal before falling back to vertical formatting.
+
+- **Default value**: `60`
+- **Possible values**: any positive integer that is less than or equal to the value specified for [`max_width`](#max_width)
+- **Stable**: Yes
+
+By default this option is set as a percentage of [`max_width`](#max_width) provided by [`use_small_heuristics`](#use_small_heuristics), but a value set directly for `array_width` will take precedence. 
+
+See also [`max_width`](#max_width) and [`use_small_heuristics`](#use_small_heuristics)
+
+## `attr_fn_like_width` 
+
+Maximum width of the args of a function-like attributes before falling back to vertical formatting.
+
+- **Default value**: `70`
+- **Possible values**: any positive integer that is less than or equal to the value specified for [`max_width`](#max_width)
+- **Stable**: Yes
+
+By default this option is set as a percentage of [`max_width`](#max_width) provided by [`use_small_heuristics`](#use_small_heuristics), but a value set directly for `attr_fn_like_width` will take precedence. 
+
+See also [`max_width`](#max_width) and [`use_small_heuristics`](#use_small_heuristics)
 
 ## `binop_separator`
 
@@ -272,6 +295,17 @@ where
 }
 ```
 
+## `chain_width` 
+
+Maximum width of a chain to fit on one line.
+
+- **Default value**: `60`
+- **Possible values**: any positive integer that is less than or equal to the value specified for [`max_width`](#max_width)
+- **Stable**: Yes
+
+By default this option is set as a percentage of [`max_width`](#max_width) provided by [`use_small_heuristics`](#use_small_heuristics), but a value set directly for `chain_width` will take precedence. 
+
+See also [`max_width`](#max_width) and [`use_small_heuristics`](#use_small_heuristics)
 
 ## `color`
 
@@ -717,6 +751,17 @@ trait Lorem {
 }
 ```
 
+## `fn_call_width` 
+
+Maximum width of the args of a function call before falling back to vertical formatting.
+
+- **Default value**: `60`
+- **Possible values**: any positive integer that is less than or equal to the value specified for [`max_width`](#max_width)
+- **Stable**: Yes
+
+By default this option is set as a percentage of [`max_width`](#max_width) provided by [`use_small_heuristics`](#use_small_heuristics), but a value set directly for `fn_call_width` will take precedence. 
+
+See also [`max_width`](#max_width) and [`use_small_heuristics`](#use_small_heuristics)
 
 ## `fn_single_line`
 
@@ -2079,6 +2124,18 @@ Don't reformat out of line modules
 - **Possible values**: `true`, `false`
 - **Stable**: No (tracking issue: #3389)
 
+## `single_line_if_else_max_width` 
+
+Maximum line length for single line if-else expressions. A value of `0` (zero) results in if-else expressions always being broken into multiple lines. Note this occurs when `use_small_heuristics` is set to `Off`.
+
+- **Default value**: `50`
+- **Possible values**: any positive integer that is less than or equal to the value specified for [`max_width`](#max_width)
+- **Stable**: Yes
+
+By default this option is set as a percentage of [`max_width`](#max_width) provided by [`use_small_heuristics`](#use_small_heuristics), but a value set directly for `single_line_if_else_max_width` will take precedence. 
+
+See also [`max_width`](#max_width) and [`use_small_heuristics`](#use_small_heuristics)
+
 ## `space_after_colon`
 
 Leave a space after the colon.
@@ -2256,6 +2313,29 @@ fn main() {
 
 See also: [`indent_style`](#indent_style).
 
+## `struct_lit_width` 
+
+Maximum width in the body of a struct literal before falling back to vertical formatting. A value of `0` (zero) results in struct literals always being broken into multiple lines. Note this occurs when `use_small_heuristics` is set to `Off`.
+
+- **Default value**: `18`
+- **Possible values**: any positive integer that is less than or equal to the value specified for [`max_width`](#max_width)
+- **Stable**: Yes
+
+By default this option is set as a percentage of [`max_width`](#max_width) provided by [`use_small_heuristics`](#use_small_heuristics), but a value set directly for `struct_lit_width` will take precedence. 
+
+See also [`max_width`](#max_width), [`use_small_heuristics`](#use_small_heuristics), and [`struct_lit_single_line`](#struct_lit_single_line)
+
+## `struct_variant_width` 
+
+Maximum width in the body of a struct variant before falling back to vertical formatting. A value of `0` (zero) results in struct literals always being broken into multiple lines. Note this occurs when `use_small_heuristics` is set to `Off`.
+
+- **Default value**: `35`
+- **Possible values**: any positive integer that is less than or equal to the value specified for [`max_width`](#max_width)
+- **Stable**: Yes
+
+By default this option is set as a percentage of [`max_width`](#max_width) provided by [`use_small_heuristics`](#use_small_heuristics), but a value set directly for `struct_variant_width` will take precedence. 
+
+See also [`max_width`](#max_width) and [`use_small_heuristics`](#use_small_heuristics)
 
 ## `tab_spaces`
 
@@ -2448,13 +2528,43 @@ fn main() {
 
 ## `use_small_heuristics`
 
-Whether to use different formatting for items and expressions if they satisfy a heuristic notion of 'small'.
+This option can be used to simplify the management and bulk updates of the granular width configuration settings ([`fn_call_width`](#fn_call_width), [`attr_fn_like_width`](#attr_fn_like_width), [`struct_lit_width`](#struct_lit_width), [`struct_variant_width`](#struct_variant_width), [`array_width`](#array_width), [`chain_width`](#chain_width), [`single_line_if_else_max_width`](#single_line_if_else_max_width)), that respectively control when formatted constructs are multi-lined/vertical based on width.
+
+Note that explicitly provided values for the width configuration settings take precedence and override the calculated values determined by `use_small_heuristics`. 
 
 - **Default value**: `"Default"`
 - **Possible values**: `"Default"`, `"Off"`, `"Max"`
 - **Stable**: Yes
 
 #### `Default` (default):
+When `use_small_heuristics` is set to `Default`, the values for the granular width settings are calculated as a ratio of the value for `max_width`.
+
+The ratios are:
+* [`fn_call_width`](#fn_call_width) - `60%`
+* [`attr_fn_like_width`](#attr_fn_like_width) - `70%`
+* [`struct_lit_width`](#struct_lit_width) - `18%`
+* [`struct_variant_width`](#struct_variant_width) - `35%`
+* [`array_width`](#array_width) - `60%`
+* [`chain_width`](#chain_width) - `60%`
+* [`single_line_if_else_max_width`](#single_line_if_else_max_width) - `50%`
+
+For example when `max_width` is set to `100`, the width settings are:
+* `fn_call_width=60`
+* `attr_fn_like_width=70`
+* `struct_lit_width=18`
+* `struct_variant_width=35`
+* `array_width=60`
+* `chain_width=60`
+* `single_line_if_else_max_width=50`
+
+and when `max_width` is set to `200`:
+* `fn_call_width=120`
+* `attr_fn_like_width=140`
+* `struct_lit_width=36`
+* `struct_variant_width=70`
+* `array_width=120`
+* `chain_width=120`
+* `single_line_if_else_max_width=100`
 
 ```rust
 enum Lorem {
@@ -2485,6 +2595,7 @@ fn main() {
 ```
 
 #### `Off`:
+When `use_small_heuristics` is set to `Off`, the granular width settings are functionally disabled and ignored. See the documentation for the respective width config options for specifics. 
 
 ```rust
 enum Lorem {
@@ -2513,6 +2624,16 @@ fn main() {
 ```
 
 #### `Max`:
+When `use_small_heuristics` is set to `Max`, then each granular width setting is set to the same value as `max_width`.
+
+So if `max_width` is set to `200`, then all the width settings are also set to `200`.
+* `fn_call_width=200`
+* `attr_fn_like_width=200`
+* `struct_lit_width=200`
+* `struct_variant_width=200`
+* `array_width=200`
+* `chain_width=200`
+* `single_line_if_else_max_width=200`
 
 ```rust
 enum Lorem {
@@ -2530,6 +2651,17 @@ fn main() {
 }
 ```
 
+
+See also:
+* [`max_width`](#max_width)
+* [`fn_call_width`](#fn_call_width)
+* [`attr_fn_like_width`](#attr_fn_like_width)
+* [`struct_lit_width`](#struct_lit_width)
+* [`struct_variant_width`](#struct_variant_width)
+* [`array_width`](#array_width)
+* [`chain_width`](#chain_width)
+* [`single_line_if_else_max_width`](#single_line_if_else_max_width)
+
 ## `use_try_shorthand`
 
 Replace uses of the try! macro by the ? shorthand
diff --git a/src/attr.rs b/src/attr.rs
index 015e9f9b252..0b5a0aba330 100644
--- a/src/attr.rs
+++ b/src/attr.rs
@@ -300,7 +300,7 @@ impl Rewrite for ast::MetaItem {
                     // 1 = "]"
                     shape.sub_width(1)?,
                     self.span,
-                    context.config.width_heuristics().attr_fn_like_width,
+                    context.config.attr_fn_like_width(),
                     Some(if has_trailing_comma {
                         SeparatorTactic::Always
                     } else {
diff --git a/src/chains.rs b/src/chains.rs
index ac14ec9e110..8053f0e8fec 100644
--- a/src/chains.rs
+++ b/src/chains.rs
@@ -577,7 +577,7 @@ impl<'a> ChainFormatterShared<'a> {
         let one_line_budget = if self.child_count == 1 {
             shape.width
         } else {
-            min(shape.width, context.config.width_heuristics().chain_width)
+            min(shape.width, context.config.chain_width())
         }
         .saturating_sub(almost_total);
 
diff --git a/src/config/config_type.rs b/src/config/config_type.rs
index bd4a847e0f1..2f567b25521 100644
--- a/src/config/config_type.rs
+++ b/src/config/config_type.rs
@@ -95,7 +95,15 @@ macro_rules! create_config {
             pub fn $i(&mut self, value: $ty) {
                 (self.0).$i.2 = value;
                 match stringify!($i) {
-                    "max_width" | "use_small_heuristics" => self.0.set_heuristics(),
+                    "max_width"
+                    | "use_small_heuristics"
+                    | "fn_call_width"
+                    | "single_line_if_else_max_width"
+                    | "attr_fn_like_width"
+                    | "struct_lit_width"
+                    | "struct_variant_width"
+                    | "array_width"
+                    | "chain_width" => self.0.set_heuristics(),
                     "license_template_path" => self.0.set_license_template(),
                     "merge_imports" => self.0.set_merge_imports(),
                     &_ => (),
@@ -230,7 +238,15 @@ macro_rules! create_config {
                 }
 
                 match key {
-                    "max_width" | "use_small_heuristics" => self.set_heuristics(),
+                    "max_width"
+                    | "use_small_heuristics"
+                    | "fn_call_width"
+                    | "single_line_if_else_max_width"
+                    | "attr_fn_like_width"
+                    | "struct_lit_width"
+                    | "struct_variant_width"
+                    | "array_width"
+                    | "chain_width" => self.set_heuristics(),
                     "license_template_path" => self.set_license_template(),
                     "merge_imports" => self.set_merge_imports(),
                     &_ => (),
@@ -281,16 +297,93 @@ macro_rules! create_config {
                 )+
             }
 
+            fn set_width_heuristics(&mut self, heuristics: WidthHeuristics) {
+                let max_width = self.max_width.2;
+                let get_width_value = |
+                    was_set: bool,
+                    override_value: usize,
+                    heuristic_value: usize,
+                    config_key: &str,
+                | -> usize {
+                    if !was_set {
+                        return heuristic_value;
+                    }
+                    if override_value > max_width {
+                        eprintln!(
+                            "`{0}` cannot have a value that exceeds `max_width`. \
+                            `{0}` will be set to the same value as `max_width`",
+                            config_key,
+                        );
+                        return max_width;
+                    }
+                    override_value
+                };
+
+                let fn_call_width = get_width_value(
+                    self.was_set().fn_call_width(),
+                    self.fn_call_width.2,
+                    heuristics.fn_call_width,
+                    "fn_call_width",
+                );
+                self.fn_call_width.2 = fn_call_width;
+
+                let attr_fn_like_width = get_width_value(
+                    self.was_set().attr_fn_like_width(),
+                    self.attr_fn_like_width.2,
+                    heuristics.attr_fn_like_width,
+                    "attr_fn_like_width",
+                );
+                self.attr_fn_like_width.2 = attr_fn_like_width;
+
+                let struct_lit_width = get_width_value(
+                    self.was_set().struct_lit_width(),
+                    self.struct_lit_width.2,
+                    heuristics.struct_lit_width,
+                    "struct_lit_width",
+                );
+                self.struct_lit_width.2 = struct_lit_width;
+
+                let struct_variant_width = get_width_value(
+                    self.was_set().struct_variant_width(),
+                    self.struct_variant_width.2,
+                    heuristics.struct_variant_width,
+                    "struct_variant_width",
+                );
+                self.struct_variant_width.2 = struct_variant_width;
+
+                let array_width = get_width_value(
+                    self.was_set().array_width(),
+                    self.array_width.2,
+                    heuristics.array_width,
+                    "array_width",
+                );
+                self.array_width.2 = array_width;
+
+                let chain_width = get_width_value(
+                    self.was_set().chain_width(),
+                    self.chain_width.2,
+                    heuristics.chain_width,
+                    "chain_width",
+                );
+                self.chain_width.2 = chain_width;
+
+                let single_line_if_else_max_width = get_width_value(
+                    self.was_set().single_line_if_else_max_width(),
+                    self.single_line_if_else_max_width.2,
+                    heuristics.single_line_if_else_max_width,
+                    "single_line_if_else_max_width",
+                );
+                self.single_line_if_else_max_width.2 = single_line_if_else_max_width;
+            }
+
             fn set_heuristics(&mut self) {
-                if self.use_small_heuristics.2 == Heuristics::Default {
-                    let max_width = self.max_width.2;
-                    self.set().width_heuristics(WidthHeuristics::scaled(max_width));
-                } else if self.use_small_heuristics.2 == Heuristics::Max {
-                    let max_width = self.max_width.2;
-                    self.set().width_heuristics(WidthHeuristics::set(max_width));
-                } else {
-                    self.set().width_heuristics(WidthHeuristics::null());
-                }
+                let max_width = self.max_width.2;
+                match self.use_small_heuristics.2 {
+                    Heuristics::Default =>
+                        self.set_width_heuristics(WidthHeuristics::scaled(max_width)),
+                    Heuristics::Max => self.set_width_heuristics(WidthHeuristics::set(max_width)),
+                    Heuristics::Off => self.set_width_heuristics(WidthHeuristics::null()),
+                };
             }
 
             fn set_license_template(&mut self) {
diff --git a/src/config/mod.rs b/src/config/mod.rs
index dfce7977bfe..8c04363b1fd 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -35,9 +35,26 @@ create_config! {
     hard_tabs: bool, false, true, "Use tab characters for indentation, spaces for alignment";
     tab_spaces: usize, 4, true, "Number of spaces per tab";
     newline_style: NewlineStyle, NewlineStyle::Auto, true, "Unix or Windows line endings";
+    indent_style: IndentStyle, IndentStyle::Block, false, "How do we indent expressions or items";
+
+    // Width Heuristics
     use_small_heuristics: Heuristics, Heuristics::Default, true, "Whether to use different \
         formatting for items and expressions if they satisfy a heuristic notion of 'small'";
-    indent_style: IndentStyle, IndentStyle::Block, false, "How do we indent expressions or items";
+    width_heuristics: WidthHeuristics, WidthHeuristics::scaled(100), false,
+        "'small' heuristic values";
+    fn_call_width: usize, 60, true, "Maximum width of the args of a function call before \
+        falling back to vertical formatting.";
+    attr_fn_like_width: usize, 70, true, "Maximum width of the args of a function-like \
+        attributes before falling back to vertical formatting.";
+    struct_lit_width: usize, 18, true, "Maximum width in the body of a struct lit before \
+        falling back to vertical formatting.";
+    struct_variant_width: usize, 35, true, "Maximum width in the body of a struct variant before \
+        falling back to vertical formatting.";
+    array_width: usize, 60, true,  "Maximum width of an array literal before falling \
+        back to vertical formatting.";
+    chain_width: usize, 60, true, "Maximum length of a chain to fit on a single line.";
+    single_line_if_else_max_width: usize, 50, true, "Maximum line length for single line if-else \
+        expressions. A value of zero means always break if-else expressions.";
 
     // Comments. macros, and strings
     wrap_comments: bool, false, false, "Break comments to fit on the line";
@@ -154,8 +171,6 @@ create_config! {
     file_lines: FileLines, FileLines::all(), false,
         "Lines to format; this is not supported in rustfmt.toml, and can only be specified \
          via the --file-lines option";
-    width_heuristics: WidthHeuristics, WidthHeuristics::scaled(100), false,
-        "'small' heuristic values";
     emit_mode: EmitMode, EmitMode::Files, false,
         "What emit Mode to use when none is supplied";
     make_backup: bool, false, false, "Backup changed files";
@@ -394,9 +409,6 @@ mod test {
         create_config! {
             // Options that are used by the generated functions
             max_width: usize, 100, true, "Maximum width of each line";
-            use_small_heuristics: Heuristics, Heuristics::Default, true,
-                "Whether to use different formatting for items and \
-                 expressions if they satisfy a heuristic notion of 'small'.";
             license_template_path: String, String::default(), false,
                 "Beginning of file must match license template";
             required_version: String, env!("CARGO_PKG_VERSION").to_owned(), false,
@@ -408,13 +420,33 @@ mod test {
             file_lines: FileLines, FileLines::all(), false,
                 "Lines to format; this is not supported in rustfmt.toml, and can only be specified \
                     via the --file-lines option";
-            width_heuristics: WidthHeuristics, WidthHeuristics::scaled(100), false,
-                "'small' heuristic values";
+
             // merge_imports deprecation
             imports_granularity: ImportGranularity, ImportGranularity::Preserve, false,
                 "Merge imports";
             merge_imports: bool, false, false, "(deprecated: use imports_granularity instead)";
 
+            // Width Heuristics
+            use_small_heuristics: Heuristics, Heuristics::Default, true,
+                "Whether to use different formatting for items and \
+                 expressions if they satisfy a heuristic notion of 'small'.";
+            width_heuristics: WidthHeuristics, WidthHeuristics::scaled(100), false,
+                "'small' heuristic values";
+
+            fn_call_width: usize, 60, true, "Maximum width of the args of a function call before \
+                falling back to vertical formatting.";
+            attr_fn_like_width: usize, 70, true, "Maximum width of the args of a function-like \
+                attributes before falling back to vertical formatting.";
+            struct_lit_width: usize, 18, true, "Maximum width in the body of a struct lit before \
+                falling back to vertical formatting.";
+            struct_variant_width: usize, 35, true, "Maximum width in the body of a struct \
+                variant before falling back to vertical formatting.";
+            array_width: usize, 60, true,  "Maximum width of an array literal before falling \
+                back to vertical formatting.";
+            chain_width: usize, 60, true, "Maximum length of a chain to fit on a single line.";
+            single_line_if_else_max_width: usize, 50, true, "Maximum line length for single \
+                line if-else expressions. A value of zero means always break if-else expressions.";
+
             // Options that are used by the tests
             stable_option: bool, false, true, "A stable option";
             unstable_option: bool, false, false, "An unstable option";
@@ -519,8 +551,15 @@ mod test {
 hard_tabs = false
 tab_spaces = 4
 newline_style = "Auto"
-use_small_heuristics = "Default"
 indent_style = "Block"
+use_small_heuristics = "Default"
+fn_call_width = 60
+attr_fn_like_width = 70
+struct_lit_width = 18
+struct_variant_width = 35
+array_width = 60
+chain_width = 60
+single_line_if_else_max_width = 50
 wrap_comments = false
 format_code_in_doc_comments = false
 comment_width = 80
@@ -683,4 +722,242 @@ make_backup = false
             assert_eq!(config.imports_granularity(), ImportGranularity::Module);
         }
     }
+
+    #[cfg(test)]
+    mod use_small_heuristics {
+        use super::*;
+
+        #[test]
+        fn test_default_sets_correct_widths() {
+            let toml = r#"
+                use_small_heuristics = "Default"
+                max_width = 200
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.array_width(), 120);
+            assert_eq!(config.attr_fn_like_width(), 140);
+            assert_eq!(config.chain_width(), 120);
+            assert_eq!(config.fn_call_width(), 120);
+            assert_eq!(config.single_line_if_else_max_width(), 100);
+            assert_eq!(config.struct_lit_width(), 36);
+            assert_eq!(config.struct_variant_width(), 70);
+        }
+
+        #[test]
+        fn test_max_sets_correct_widths() {
+            let toml = r#"
+                use_small_heuristics = "Max"
+                max_width = 120
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.array_width(), 120);
+            assert_eq!(config.attr_fn_like_width(), 120);
+            assert_eq!(config.chain_width(), 120);
+            assert_eq!(config.fn_call_width(), 120);
+            assert_eq!(config.single_line_if_else_max_width(), 120);
+            assert_eq!(config.struct_lit_width(), 120);
+            assert_eq!(config.struct_variant_width(), 120);
+        }
+
+        #[test]
+        fn test_off_sets_correct_widths() {
+            let toml = r#"
+                use_small_heuristics = "Off"
+                max_width = 100
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.array_width(), usize::max_value());
+            assert_eq!(config.attr_fn_like_width(), usize::max_value());
+            assert_eq!(config.chain_width(), usize::max_value());
+            assert_eq!(config.fn_call_width(), usize::max_value());
+            assert_eq!(config.single_line_if_else_max_width(), 0);
+            assert_eq!(config.struct_lit_width(), 0);
+            assert_eq!(config.struct_variant_width(), 0);
+        }
+
+        #[test]
+        fn test_override_works_with_default() {
+            let toml = r#"
+                use_small_heuristics = "Default"
+                array_width = 20
+                attr_fn_like_width = 40
+                chain_width = 20
+                fn_call_width = 90
+                single_line_if_else_max_width = 40
+                struct_lit_width = 30
+                struct_variant_width = 34
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.array_width(), 20);
+            assert_eq!(config.attr_fn_like_width(), 40);
+            assert_eq!(config.chain_width(), 20);
+            assert_eq!(config.fn_call_width(), 90);
+            assert_eq!(config.single_line_if_else_max_width(), 40);
+            assert_eq!(config.struct_lit_width(), 30);
+            assert_eq!(config.struct_variant_width(), 34);
+        }
+
+        #[test]
+        fn test_override_with_max() {
+            let toml = r#"
+                use_small_heuristics = "Max"
+                array_width = 20
+                attr_fn_like_width = 40
+                chain_width = 20
+                fn_call_width = 90
+                single_line_if_else_max_width = 40
+                struct_lit_width = 30
+                struct_variant_width = 34
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.array_width(), 20);
+            assert_eq!(config.attr_fn_like_width(), 40);
+            assert_eq!(config.chain_width(), 20);
+            assert_eq!(config.fn_call_width(), 90);
+            assert_eq!(config.single_line_if_else_max_width(), 40);
+            assert_eq!(config.struct_lit_width(), 30);
+            assert_eq!(config.struct_variant_width(), 34);
+        }
+
+        #[test]
+        fn test_override_with_off() {
+            let toml = r#"
+                use_small_heuristics = "Off"
+                array_width = 20
+                attr_fn_like_width = 40
+                chain_width = 20
+                fn_call_width = 90
+                single_line_if_else_max_width = 40
+                struct_lit_width = 30
+                struct_variant_width = 34
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.array_width(), 20);
+            assert_eq!(config.attr_fn_like_width(), 40);
+            assert_eq!(config.chain_width(), 20);
+            assert_eq!(config.fn_call_width(), 90);
+            assert_eq!(config.single_line_if_else_max_width(), 40);
+            assert_eq!(config.struct_lit_width(), 30);
+            assert_eq!(config.struct_variant_width(), 34);
+        }
+
+        #[test]
+        fn test_fn_call_width_config_exceeds_max_width() {
+            let toml = r#"
+                max_width = 90
+                fn_call_width = 95
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.fn_call_width(), 90);
+        }
+
+        #[test]
+        fn test_attr_fn_like_width_config_exceeds_max_width() {
+            let toml = r#"
+                max_width = 80
+                attr_fn_like_width = 90
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.attr_fn_like_width(), 80);
+        }
+
+        #[test]
+        fn test_struct_lit_config_exceeds_max_width() {
+            let toml = r#"
+                max_width = 78
+                struct_lit_width = 90
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.struct_lit_width(), 78);
+        }
+
+        #[test]
+        fn test_struct_variant_width_config_exceeds_max_width() {
+            let toml = r#"
+                max_width = 80
+                struct_variant_width = 90
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.struct_variant_width(), 80);
+        }
+
+        #[test]
+        fn test_array_width_config_exceeds_max_width() {
+            let toml = r#"
+                max_width = 60
+                array_width = 80
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.array_width(), 60);
+        }
+
+        #[test]
+        fn test_chain_width_config_exceeds_max_width() {
+            let toml = r#"
+                max_width = 80
+                chain_width = 90
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.chain_width(), 80);
+        }
+
+        #[test]
+        fn test_single_line_if_else_max_width_config_exceeds_max_width() {
+            let toml = r#"
+                max_width = 70
+                single_line_if_else_max_width = 90
+            "#;
+            let config = Config::from_toml(toml, Path::new("")).unwrap();
+            assert_eq!(config.single_line_if_else_max_width(), 70);
+        }
+
+        #[test]
+        fn test_override_fn_call_width_exceeds_max_width() {
+            let mut config = Config::default();
+            config.override_value("fn_call_width", "101");
+            assert_eq!(config.fn_call_width(), 100);
+        }
+
+        #[test]
+        fn test_override_attr_fn_like_width_exceeds_max_width() {
+            let mut config = Config::default();
+            config.override_value("attr_fn_like_width", "101");
+            assert_eq!(config.attr_fn_like_width(), 100);
+        }
+
+        #[test]
+        fn test_override_struct_lit_exceeds_max_width() {
+            let mut config = Config::default();
+            config.override_value("struct_lit_width", "101");
+            assert_eq!(config.struct_lit_width(), 100);
+        }
+
+        #[test]
+        fn test_override_struct_variant_width_exceeds_max_width() {
+            let mut config = Config::default();
+            config.override_value("struct_variant_width", "101");
+            assert_eq!(config.struct_variant_width(), 100);
+        }
+
+        #[test]
+        fn test_override_array_width_exceeds_max_width() {
+            let mut config = Config::default();
+            config.override_value("array_width", "101");
+            assert_eq!(config.array_width(), 100);
+        }
+
+        #[test]
+        fn test_override_chain_width_exceeds_max_width() {
+            let mut config = Config::default();
+            config.override_value("chain_width", "101");
+            assert_eq!(config.chain_width(), 100);
+        }
+
+        #[test]
+        fn test_override_single_line_if_else_max_width_exceeds_max_width() {
+            let mut config = Config::default();
+            config.override_value("single_line_if_else_max_width", "101");
+            assert_eq!(config.single_line_if_else_max_width(), 100);
+        }
+    }
 }
diff --git a/src/config/options.rs b/src/config/options.rs
index c0491630c00..3b91021813c 100644
--- a/src/config/options.rs
+++ b/src/config/options.rs
@@ -79,13 +79,15 @@ pub enum TypeDensity {
 }
 
 #[config_type]
-/// To what extent does rustfmt pursue its heuristics?
+/// Heuristic settings that can be used to simply
+/// the configuration of the granular width configurations
+/// like `struct_lit_width`, `array_width`, etc.
 pub enum Heuristics {
     /// Turn off any heuristics
     Off,
     /// Turn on max heuristics
     Max,
-    /// Use Rustfmt's defaults
+    /// Use scaled values based on the value of `max_width`
     Default,
 }
 
diff --git a/src/expr.rs b/src/expr.rs
index d3fd22653b4..ced382c4915 100644
--- a/src/expr.rs
+++ b/src/expr.rs
@@ -899,22 +899,11 @@ impl<'a> ControlFlow<'a> {
                 || last_line_offsetted(shape.used_width(), &pat_expr_string));
 
         // Try to format if-else on single line.
-        if self.allow_single_line
-            && context
-                .config
-                .width_heuristics()
-                .single_line_if_else_max_width
-                > 0
-        {
+        if self.allow_single_line && context.config.single_line_if_else_max_width() > 0 {
             let trial = self.rewrite_single_line(&pat_expr_string, context, shape.width);
 
             if let Some(cond_str) = trial {
-                if cond_str.len()
-                    <= context
-                        .config
-                        .width_heuristics()
-                        .single_line_if_else_max_width
-                {
+                if cond_str.len() <= context.config.single_line_if_else_max_width() {
                     return Some((cond_str, 0));
                 }
             }
@@ -1246,7 +1235,7 @@ pub(crate) fn rewrite_call(
         args.iter(),
         shape,
         span,
-        context.config.width_heuristics().fn_call_width,
+        context.config.fn_call_width(),
         choose_separator_tactic(context, span),
     )
 }
@@ -1785,7 +1774,7 @@ pub(crate) fn rewrite_tuple<'a, T: 'a + IntoOverflowableItem<'a>>(
             items,
             shape,
             span,
-            context.config.width_heuristics().fn_call_width,
+            context.config.fn_call_width(),
             force_tactic,
         )
     } else {
diff --git a/src/items.rs b/src/items.rs
index 61b49911e76..ecbd0bd12ec 100644
--- a/src/items.rs
+++ b/src/items.rs
@@ -505,8 +505,8 @@ impl<'a> FmtVisitor<'a> {
             )
             .collect()
         };
-        let mut items: Vec<_> =
-            itemize_list_with(self.config.width_heuristics().struct_variant_width);
+        let mut items: Vec<_> = itemize_list_with(self.config.struct_variant_width());
+
         // If one of the variants use multiple lines, use multi-lined formatting for all variants.
         let has_multiline_variant = items.iter().any(|item| item.inner_as_ref().contains('\n'));
         let has_single_line_variant = items.iter().any(|item| !item.inner_as_ref().contains('\n'));
@@ -1479,7 +1479,7 @@ fn format_tuple_struct(
             fields.iter(),
             shape,
             span,
-            context.config.width_heuristics().fn_call_width,
+            context.config.fn_call_width(),
             None,
         )?;
     }
diff --git a/src/lists.rs b/src/lists.rs
index bc55ef6686a..ccf8f784c04 100644
--- a/src/lists.rs
+++ b/src/lists.rs
@@ -863,7 +863,7 @@ pub(crate) fn struct_lit_shape(
     };
     let shape_width = shape.width.checked_sub(prefix_width + suffix_width);
     if let Some(w) = shape_width {
-        let shape_width = cmp::min(w, context.config.width_heuristics().struct_lit_width);
+        let shape_width = cmp::min(w, context.config.struct_lit_width());
         Some((Some(Shape::legacy(shape_width, shape.indent)), v_shape))
     } else {
         Some((None, v_shape))
diff --git a/src/macros.rs b/src/macros.rs
index 190f4b599b0..52534b216a6 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -382,7 +382,7 @@ fn rewrite_macro_inner(
                     arg_vec.iter(),
                     shape,
                     mac.span(),
-                    context.config.width_heuristics().fn_call_width,
+                    context.config.fn_call_width(),
                     if trailing_comma {
                         Some(SeparatorTactic::Always)
                     } else {
diff --git a/src/overflow.rs b/src/overflow.rs
index f1b870101e5..d670b0a41e8 100644
--- a/src/overflow.rs
+++ b/src/overflow.rs
@@ -318,7 +318,7 @@ pub(crate) fn rewrite_with_square_brackets<'a, T: 'a + IntoOverflowableItem<'a>>
         span,
         lhs,
         rhs,
-        context.config.width_heuristics().array_width,
+        context.config.array_width(),
         force_separator_tactic,
         Some(("[", "]")),
     )
diff --git a/tests/source/configs/chain_width/always.rs b/tests/source/configs/chain_width/always.rs
new file mode 100644
index 00000000000..2d16d66aec1
--- /dev/null
+++ b/tests/source/configs/chain_width/always.rs
@@ -0,0 +1,23 @@
+// rustfmt-chain_width: 1
+// setting an unachievable chain_width to always get chains
+// on separate lines
+
+struct Fluent {}
+
+impl Fluent {
+    fn blorp(&self) -> &Self {
+        self
+    }
+}
+
+fn main() {
+    let test = Fluent {};
+
+    // should be left alone
+    test.blorp();
+
+    // should be wrapped
+    test.blorp().blorp();
+    test.blorp().blorp().blorp();
+    test.blorp().blorp().blorp().blorp();
+}
diff --git a/tests/source/configs/chain_width/small.rs b/tests/source/configs/chain_width/small.rs
new file mode 100644
index 00000000000..26f9354537a
--- /dev/null
+++ b/tests/source/configs/chain_width/small.rs
@@ -0,0 +1,23 @@
+// rustfmt-chain_width: 40
+
+struct Fluent {}
+
+impl Fluent {
+    fn blorp(&self) -> &Self {
+        self
+    }
+}
+
+fn main() {
+    let test = Fluent {};
+
+    // should not be wrapped
+    test.blorp();
+    test.blorp().blorp();
+    test.blorp().blorp().blorp();
+    test.blorp().blorp().blorp().blorp();
+
+    // should be wrapped
+    test.blorp().blorp().blorp().blorp().blorp();
+    test.blorp().blorp().blorp().blorp().blorp().blorp();
+}
diff --git a/tests/source/configs/chain_width/tiny.rs b/tests/source/configs/chain_width/tiny.rs
new file mode 100644
index 00000000000..fffc81dd5d6
--- /dev/null
+++ b/tests/source/configs/chain_width/tiny.rs
@@ -0,0 +1,21 @@
+// rustfmt-chain_width: 20
+
+struct Fluent {}
+
+impl Fluent {
+    fn blorp(&self) -> &Self {
+        self
+    }
+}
+
+fn main() {
+    let test = Fluent {};
+
+    // should not be wrapped
+    test.blorp();
+    test.blorp().blorp();
+
+    // should be wrapped
+    test.blorp().blorp().blorp();
+    test.blorp().blorp().blorp().blorp();
+}
diff --git a/tests/source/configs/use_small_heuristics/default.rs b/tests/source/configs/use_small_heuristics/default.rs
new file mode 100644
index 00000000000..68bc40271a1
--- /dev/null
+++ b/tests/source/configs/use_small_heuristics/default.rs
@@ -0,0 +1,25 @@
+// rustfmt-use_small_heuristics: Default
+
+enum Lorem {
+    Ipsum,
+    Dolor(bool),
+    Sit {
+        amet: Consectetur,
+        adipiscing: Elit,
+    },
+}
+
+fn main() {
+    lorem("lorem", "ipsum", "dolor", "sit", "amet", "consectetur", "adipiscing");
+
+    let lorem = Lorem {
+        ipsum: dolor,
+        sit: amet,
+    };
+
+    let lorem = if ipsum {
+        dolor
+    } else {
+        sit
+    };
+}
diff --git a/tests/source/configs/use_small_heuristics/off.rs b/tests/source/configs/use_small_heuristics/off.rs
new file mode 100644
index 00000000000..f76392d2404
--- /dev/null
+++ b/tests/source/configs/use_small_heuristics/off.rs
@@ -0,0 +1,25 @@
+// rustfmt-use_small_heuristics: Off
+
+enum Lorem {
+    Ipsum,
+    Dolor(bool),
+    Sit {
+        amet: Consectetur,
+        adipiscing: Elit,
+    },
+}
+
+fn main() {
+    lorem("lorem", "ipsum", "dolor", "sit", "amet", "consectetur", "adipiscing");
+
+    let lorem = Lorem {
+        ipsum: dolor,
+        sit: amet,
+    };
+
+    let lorem = if ipsum {
+        dolor
+    } else {
+        sit
+    };
+}
diff --git a/tests/target/configs/chain_width/always.rs b/tests/target/configs/chain_width/always.rs
new file mode 100644
index 00000000000..b16d25251f6
--- /dev/null
+++ b/tests/target/configs/chain_width/always.rs
@@ -0,0 +1,29 @@
+// rustfmt-chain_width: 1
+// setting an unachievable chain_width to always get chains
+// on separate lines
+
+struct Fluent {}
+
+impl Fluent {
+    fn blorp(&self) -> &Self {
+        self
+    }
+}
+
+fn main() {
+    let test = Fluent {};
+
+    // should be left alone
+    test.blorp();
+
+    // should be wrapped
+    test.blorp()
+        .blorp();
+    test.blorp()
+        .blorp()
+        .blorp();
+    test.blorp()
+        .blorp()
+        .blorp()
+        .blorp();
+}
diff --git a/tests/target/configs/chain_width/small.rs b/tests/target/configs/chain_width/small.rs
new file mode 100644
index 00000000000..2f2f72777f8
--- /dev/null
+++ b/tests/target/configs/chain_width/small.rs
@@ -0,0 +1,32 @@
+// rustfmt-chain_width: 40
+
+struct Fluent {}
+
+impl Fluent {
+    fn blorp(&self) -> &Self {
+        self
+    }
+}
+
+fn main() {
+    let test = Fluent {};
+
+    // should not be wrapped
+    test.blorp();
+    test.blorp().blorp();
+    test.blorp().blorp().blorp();
+    test.blorp().blorp().blorp().blorp();
+
+    // should be wrapped
+    test.blorp()
+        .blorp()
+        .blorp()
+        .blorp()
+        .blorp();
+    test.blorp()
+        .blorp()
+        .blorp()
+        .blorp()
+        .blorp()
+        .blorp();
+}
diff --git a/tests/target/configs/chain_width/tiny.rs b/tests/target/configs/chain_width/tiny.rs
new file mode 100644
index 00000000000..960d245f8a1
--- /dev/null
+++ b/tests/target/configs/chain_width/tiny.rs
@@ -0,0 +1,26 @@
+// rustfmt-chain_width: 20
+
+struct Fluent {}
+
+impl Fluent {
+    fn blorp(&self) -> &Self {
+        self
+    }
+}
+
+fn main() {
+    let test = Fluent {};
+
+    // should not be wrapped
+    test.blorp();
+    test.blorp().blorp();
+
+    // should be wrapped
+    test.blorp()
+        .blorp()
+        .blorp();
+    test.blorp()
+        .blorp()
+        .blorp()
+        .blorp();
+}
diff --git a/tests/target/configs/use_small_heuristics/default.rs b/tests/target/configs/use_small_heuristics/default.rs
new file mode 100644
index 00000000000..d67bd9aafaf
--- /dev/null
+++ b/tests/target/configs/use_small_heuristics/default.rs
@@ -0,0 +1,26 @@
+// rustfmt-use_small_heuristics: Default
+
+enum Lorem {
+    Ipsum,
+    Dolor(bool),
+    Sit { amet: Consectetur, adipiscing: Elit },
+}
+
+fn main() {
+    lorem(
+        "lorem",
+        "ipsum",
+        "dolor",
+        "sit",
+        "amet",
+        "consectetur",
+        "adipiscing",
+    );
+
+    let lorem = Lorem {
+        ipsum: dolor,
+        sit: amet,
+    };
+
+    let lorem = if ipsum { dolor } else { sit };
+}
diff --git a/tests/target/configs/use_small_heuristics/off.rs b/tests/target/configs/use_small_heuristics/off.rs
new file mode 100644
index 00000000000..f76392d2404
--- /dev/null
+++ b/tests/target/configs/use_small_heuristics/off.rs
@@ -0,0 +1,25 @@
+// rustfmt-use_small_heuristics: Off
+
+enum Lorem {
+    Ipsum,
+    Dolor(bool),
+    Sit {
+        amet: Consectetur,
+        adipiscing: Elit,
+    },
+}
+
+fn main() {
+    lorem("lorem", "ipsum", "dolor", "sit", "amet", "consectetur", "adipiscing");
+
+    let lorem = Lorem {
+        ipsum: dolor,
+        sit: amet,
+    };
+
+    let lorem = if ipsum {
+        dolor
+    } else {
+        sit
+    };
+}
diff --git a/tests/target/issue_4049.rs b/tests/target/issue_4049.rs
new file mode 100644
index 00000000000..fe025a0f649
--- /dev/null
+++ b/tests/target/issue_4049.rs
@@ -0,0 +1,26 @@
+// rustfmt-max_width: 110
+// rustfmt-use_small_heuristics: Max
+// rustfmt-hard_tabs: true
+// rustfmt-use_field_init_shorthand: true
+// rustfmt-overflow_delimited_expr: true
+
+// https://github.com/rust-lang/rustfmt/issues/4049
+fn foo() {
+	{
+		{
+			if let Some(MpcEv::PlayDrum(pitch, vel)) =
+				// self.mpc.handle_input(e, /*btn_ctrl_down,*/ tx_launch_to_daw, state_view)
+				self.mpc.handle_input(e, &mut MyBorrowedState { tx_launch_to_daw, state_view })
+			{
+				println!("bar");
+			}
+
+			if let Some(e) =
+				// self.note_input.handle_input(e, /*btn_ctrl_down,*/ tx_launch_to_daw, state_view)
+				self.note_input.handle_input(e, &mut MyBorrowedState { tx_launch_to_daw, state_view })
+			{
+				println!("baz");
+			}
+		}
+	}
+}