diff --git a/lib/cocktail/builder/i_calendar.ex b/lib/cocktail/builder/i_calendar.ex
index 90f309d..91a3488 100644
--- a/lib/cocktail/builder/i_calendar.ex
+++ b/lib/cocktail/builder/i_calendar.ex
@@ -38,7 +38,7 @@ defmodule Cocktail.Builder.ICalendar do
   def build(schedule) do
     rules =
       schedule.recurrence_rules
-      |> Enum.map(&build_rule/1)
+      |> Enum.map(&do_build_rule/1)
 
     times =
       schedule.recurrence_times
@@ -56,6 +56,35 @@ defmodule Cocktail.Builder.ICalendar do
     |> Enum.join("\n")
   end
 
+  @doc ~S"""
+  Builds an iCalendar RRULE format string representation of a `t:Cocktail.Schedule.t/0`
+
+  ## Examples
+
+      iex> alias Cocktail.Schedule
+      ...> start_time = Timex.to_datetime(~N[2017-01-01 06:00:00], "America/Los_Angeles")
+      ...> schedule = Schedule.new(start_time)
+      ...> schedule = Schedule.add_recurrence_rule(schedule, :daily, interval: 2, hours: [10, 12])
+      ...> build_rule(schedule)
+      "RRULE:FREQ=DAILY;INTERVAL=2;BYHOUR=10,12"
+
+      iex> alias Cocktail.Schedule
+      ...> schedule = Schedule.new(~N[2017-01-01 06:00:00])
+      ...> schedule = Schedule.add_recurrence_rule(schedule, :daily, until: ~N[2017-01-31 11:59:59])
+      ...> build_rule(schedule)
+      "RRULE:FREQ=DAILY;UNTIL=20170131T115959"
+
+      iex> alias Cocktail.Schedule
+      ...> schedule = Schedule.new(~N[2017-01-01 06:00:00])
+      ...> schedule = Schedule.add_recurrence_rule(schedule, :daily, count: 3)
+      ...> build_rule(schedule)
+      "RRULE:FREQ=DAILY;COUNT=3"
+  """
+  @spec build_rule(Schedule.t()) :: String.t()
+  def build_rule(schedule) do
+    Enum.map(schedule.recurrence_rules, &do_build_rule/1) |> Enum.join()
+  end
+
   @spec build_time(Cocktail.time(), String.t()) :: String.t()
   defp build_time(%DateTime{} = time, prefix) do
     timezone = time.time_zone
@@ -89,8 +118,8 @@ defmodule Cocktail.Builder.ICalendar do
     |> Timex.format!(@time_format_string <> "Z")
   end
 
-  @spec build_rule(Rule.t()) :: String.t()
-  defp build_rule(%Rule{validations: validations_map, until: until, count: count}) do
+  @spec do_build_rule(Rule.t()) :: String.t()
+  defp do_build_rule(%Rule{validations: validations_map, until: until, count: count}) do
     parts =
       for key <- [
             :interval,
diff --git a/lib/cocktail/schedule.ex b/lib/cocktail/schedule.ex
index e94d849..8bcb0ab 100644
--- a/lib/cocktail/schedule.ex
+++ b/lib/cocktail/schedule.ex
@@ -228,6 +228,14 @@ defmodule Cocktail.Schedule do
   @spec to_i_calendar(t) :: String.t()
   def to_i_calendar(%__MODULE__{} = schedule), do: Builder.ICalendar.build(schedule)
 
+  @doc """
+  Builds an iCalendar RRULE format string representation of a `t:Cocktail.Schedule.t/0`.
+
+  see `Cocktail.Builder.ICalendar.build_rule/1` for details.
+  """
+  @spec to_i_calendar_rrule(t) :: String.t()
+  def to_i_calendar_rrule(%__MODULE__{} = schedule), do: Builder.ICalendar.build_rule(schedule)
+
   @doc """
   Builds a human readable string representation of a `t:Cocktail.Schedule.t/0`.
 
diff --git a/test/cocktail/builder/i_calendar_test.exs b/test/cocktail/builder/i_calendar_test.exs
index c270d4e..26930f5 100644
--- a/test/cocktail/builder/i_calendar_test.exs
+++ b/test/cocktail/builder/i_calendar_test.exs
@@ -17,6 +17,17 @@ defmodule Cocktail.Builder.ICalendarTest do
            """
   end
 
+  test "build rrule from schedule" do
+    schedule =
+      ~Y[2017-01-01 09:00:00 America/Los_Angeles]
+      |> Cocktail.schedule()
+      |> Schedule.add_recurrence_rule(:daily, until: ~Y[2017-01-31 09:00:00 America/Los_Angeles])
+
+    i_calendar_string = Schedule.to_i_calendar_rrule(schedule)
+
+    assert i_calendar_string == "RRULE:FREQ=DAILY;UNTIL=20170131T170000Z"
+  end
+
   test "build a schedule with timezone with until option" do
     schedule =
       ~Y[2017-01-01 09:00:00 America/Los_Angeles]