diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b85c38b..e11b8b03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added `is_full` to `BinaryHeap`
 - Added `is_full` to `IndexMap`
 - Added `is_full` to `IndexSet`
+- Added `is_full` to `LinearMap`
 - Added infallible conversions from arrays to `Vec`.
 - Added `Vec::spare_capacity_mut`.
 - Added `Extend` impls for `Deque`.
diff --git a/src/linear_map.rs b/src/linear_map.rs
index 28f4e83d..d6e74df4 100644
--- a/src/linear_map.rs
+++ b/src/linear_map.rs
@@ -227,6 +227,27 @@ where
         self.len() == 0
     }
 
+    /// Returns true if the map is full.
+    ///
+    /// Computes in *O*(1) time.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use heapless::LinearMap;
+    ///
+    /// let mut a: LinearMap<_, _, 4> = LinearMap::new();
+    /// assert!(!a.is_full());
+    /// a.insert(1, "a").unwrap();
+    /// a.insert(2, "b").unwrap();
+    /// a.insert(3, "c").unwrap();
+    /// a.insert(4, "d").unwrap();
+    /// assert!(a.is_full());
+    /// ```
+    pub fn is_full(&self) -> bool {
+        self.len() == self.capacity()
+    }
+
     /// An iterator visiting all key-value pairs in arbitrary order.
     ///
     /// # Examples