diff --git a/fixed_wide_vectors/src/macros/length.rs b/fixed_wide_vectors/src/macros/length.rs
new file mode 100644
index 0000000..389d7da
--- /dev/null
+++ b/fixed_wide_vectors/src/macros/length.rs
@@ -0,0 +1,15 @@
+#[doc(hidden)]
+#[macro_export(local_inner_macros)]
+macro_rules! impl_length_operations {
+    ( $struct: ident { $($field: ident), + }, $size: expr ) => {
+	    impl<U,T:Copy+fixed_wide_traits::wide::WideMul<Output=U>> $struct<T> {
+			type Output=$struct<U>;
+            #[inline]
+            fn wide_with_length(self, rhs: Self) -> Self::Output {
+            	let len=self.wide_length();
+             	let ratio=rhs.ratio(len);
+            	self.wide_mul(ratio)
+            }
+		}
+    }
+}
diff --git a/fixed_wide_vectors/src/macros/mod.rs b/fixed_wide_vectors/src/macros/mod.rs
index 0d9be65..7b6f1f9 100644
--- a/fixed_wide_vectors/src/macros/mod.rs
+++ b/fixed_wide_vectors/src/macros/mod.rs
@@ -1,5 +1,7 @@
 #[cfg(feature="fixed_wide_traits")]
 pub mod wide;
+#[cfg(all(feature="fixed_wide_traits",feature="deferred_division"))]
+pub mod length;
 
 // Stolen from https://github.com/c1m50c/fixed-vectors (MIT license)
 #[doc(hidden)]