diff --git a/Cargo.lock b/Cargo.lock
index 61fabfd9..62931cd7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -82,6 +82,7 @@ dependencies = [
  "parking_lot_core",
  "rayon",
  "serde",
+ "typesize",
 ]
 
 [[package]]
@@ -158,9 +159,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.66"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
 dependencies = [
  "unicode-ident",
 ]
@@ -239,15 +240,35 @@ checksum = "62bb4feee49fdd9f707ef802e22365a35de4b7b299de4763d44bfea899442ff9"
 
 [[package]]
 name = "syn"
-version = "2.0.29"
+version = "2.0.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c324c494eba9d92503e6f1ef2e6df781e78f6a7705a0202d9801b198807d518a"
+checksum = "ee659fb5f3d355364e1f3e5bc10fb82068efbf824a1e9d1c9504244a6469ad53"
 dependencies = [
  "proc-macro2",
  "quote",
  "unicode-ident",
 ]
 
+[[package]]
+name = "typesize"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "666137410f50df35fabf3c8ac6380d47281e9523799c74df192abba1b508b4bf"
+dependencies = [
+ "typesize-derive",
+]
+
+[[package]]
+name = "typesize-derive"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "905e88c2a4cc27686bd57e495121d451f027e441388a67f773be729ad4be1ea8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.11"
diff --git a/Cargo.toml b/Cargo.toml
index 5b3dd767..b82156d4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,7 @@ categories = ["concurrency", "algorithms", "data-structures"]
 
 [features]
 raw-api = []
+typesize = ["dep:typesize"]
 inline = ["hashbrown/inline-more"]
 
 [dependencies]
@@ -27,6 +28,7 @@ rayon = { version = "1.7.0", optional = true }
 once_cell = "1.18.0"
 arbitrary = { version = "1.3.0", optional = true }
 crossbeam-utils = "0.8"
+typesize = { version = "0.1.8", default-features = false, optional = true }
 
 [package.metadata.docs.rs]
 features = ["rayon", "raw-api", "serde"]
diff --git a/src/lib.rs b/src/lib.rs
index ad2b321a..c0abb5e6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1346,6 +1346,45 @@ impl<K: Eq + Hash, V, S: BuildHasher + Clone + Default> FromIterator<(K, V)> for
     }
 }
 
+#[cfg(feature = "typesize")]
+impl<K, V, S> typesize::TypeSize for DashMap<K, V, S>
+where
+    K: typesize::TypeSize + Eq + Hash,
+    V: typesize::TypeSize,
+    S: typesize::TypeSize + Clone + BuildHasher,
+{
+    fn extra_size(&self) -> usize {
+        let shards_extra_size: usize = self
+            .shards
+            .iter()
+            .map(|shard_lock| {
+                let shard = shard_lock.read();
+                let hashtable_size = shard.allocation_info().1.size();
+
+                // Safety: The iterator is dropped before the HashTable
+                let iter = unsafe { shard.iter() };
+                let entry_size_iter = iter.map(|bucket| {
+                    // Safety: The iterator returns buckets with valid pointers to entries
+                    let (key, value) = unsafe { bucket.as_ref() };
+                    key.extra_size() + value.get().extra_size()
+                });
+
+                core::mem::size_of::<CachePadded<RwLock<HashMap<K, V>>>>()
+                    + hashtable_size
+                    + entry_size_iter.sum::<usize>()
+            })
+            .sum();
+
+        self.hasher.extra_size() + shards_extra_size
+    }
+
+    typesize::if_typesize_details! {
+        fn get_collection_item_count(&self) -> Option<usize> {
+            Some(self.len())
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use crate::DashMap;
diff --git a/src/set.rs b/src/set.rs
index 14110084..84c9dd16 100644
--- a/src/set.rs
+++ b/src/set.rs
@@ -415,6 +415,23 @@ impl<K: Eq + Hash, S: BuildHasher + Clone + Default> FromIterator<K> for DashSet
     }
 }
 
+#[cfg(feature = "typesize")]
+impl<K, S> typesize::TypeSize for DashSet<K, S>
+where
+    K: typesize::TypeSize + Eq + Hash,
+    S: typesize::TypeSize + Clone + BuildHasher,
+{
+    fn extra_size(&self) -> usize {
+        self.inner.extra_size()
+    }
+
+    typesize::if_typesize_details! {
+        fn get_collection_item_count(&self) -> Option<usize> {
+            Some(self.len())
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use crate::DashSet;