diff --git a/core/src/size.rs b/core/src/size.rs
index 4276f05f..a02299e8 100644
--- a/core/src/size.rs
+++ b/core/src/size.rs
@@ -15,6 +15,11 @@ impl Size {
     /// [`Size`]: struct.Size.html
     pub const ZERO: Size = Size::new(0., 0.);
 
+    /// A [`Size`] with a width and height of 1 unit.
+    ///
+    /// [`Size`]: struct.Size.html
+    pub const UNIT: Size = Size::new(1., 1.);
+
     /// A [`Size`] with infinite width and height.
     ///
     /// [`Size`]: struct.Size.html