diff --git a/lib/less/functions.js b/lib/less/functions.js
index d5fe8678..1aaa0d4c 100644
--- a/lib/less/functions.js
+++ b/lib/less/functions.js
@@ -167,6 +167,9 @@ tree.functions = {
     argb: function (color) {
         return new(tree.Anonymous)(color.toARGB());
 
+    },
+    percentage: function(n) {
+        return new(tree.Dimension)(n.value * 100, '%');
     }
 };
 
diff --git a/test/css/functions.css b/test/css/functions.css
index f33b9869..810af0df 100644
--- a/test/css/functions.css
+++ b/test/css/functions.css
@@ -24,6 +24,7 @@
   lightness: 95%;
   rounded: 11;
   roundedpx: 3px;
+  percentage: 20%;
 }
 #alpha {
   alpha: rgba(153, 94, 51, 0.6);
diff --git a/test/less/functions.less b/test/less/functions.less
index 1af78bc8..27b4d0bc 100644
--- a/test/less/functions.less
+++ b/test/less/functions.less
@@ -28,6 +28,7 @@
   lightness: lightness(hsl(98, 12%, 95%));
   rounded: round(@r/3);
   roundedpx: round(10px / 3);
+  percentage: percentage(10px / 50);
 }
 
 #alpha {