diff --git a/fuzz/src/bin/arrayish.rs b/fuzz/src/bin/arrayish.rs
index 03c9ccc..2eb0652 100644
--- a/fuzz/src/bin/arrayish.rs
+++ b/fuzz/src/bin/arrayish.rs
@@ -25,6 +25,7 @@ arbitrary_stateful_operations! {
             fn extend_from_slice(&mut self, sli: &Box<[T]>);
             fn insert(&mut self, index: usize, item: T);
             fn is_empty(&self) -> bool;
+            fn is_full(&self) -> bool;
             fn len(&self) -> usize;
             fn pop(&mut self) -> Option<T>;
             fn push(&mut self, item: T);
diff --git a/fuzz/src/bin/slicevec.rs b/fuzz/src/bin/slicevec.rs
index 954b0ad..15b1636 100644
--- a/fuzz/src/bin/slicevec.rs
+++ b/fuzz/src/bin/slicevec.rs
@@ -23,6 +23,7 @@ arbitrary_stateful_operations! {
             fn extend_from_slice(&mut self, sli: &Box<[T]>);
             fn insert(&mut self, index: usize, item: T);
             fn is_empty(&self) -> bool;
+            fn is_full(&self) -> bool;
             fn len(&self) -> usize;
             fn pop(&mut self) -> Option<T>;
             fn push(&mut self, item: T);
diff --git a/src/arrayvec.rs b/src/arrayvec.rs
index c55796d..5986a5c 100644
--- a/src/arrayvec.rs
+++ b/src/arrayvec.rs
@@ -628,6 +628,13 @@ impl<A: Array> ArrayVec<A> {
     self.len == 0
   }
 
+  /// Checks if the length is equal to capacity.
+  #[inline(always)]
+  #[must_use]
+  pub fn is_full(&self) -> bool {
+    self.len() == self.capacity()
+  }
+
   /// The length of the `ArrayVec` (in elements).
   #[inline(always)]
   #[must_use]
diff --git a/src/slicevec.rs b/src/slicevec.rs
index bb6b744..bc11a46 100644
--- a/src/slicevec.rs
+++ b/src/slicevec.rs
@@ -293,6 +293,13 @@ impl<'s, T> SliceVec<'s, T> {
     self.len == 0
   }
 
+  /// Checks if the length is equal to capacity.
+  #[inline(always)]
+  #[must_use]
+  pub fn is_full(&self) -> bool {
+    self.len() == self.capacity()
+  }
+
   /// The length of the `SliceVec` (in elements).
   #[inline(always)]
   #[must_use]