diff --git a/make/units.js b/make/units.js
new file mode 100644
index 0000000..46b1eb3
--- /dev/null
+++ b/make/units.js
@@ -0,0 +1,13 @@
+make.units = {
+  lengthUnit: function () {
+    return random.pick([
+      "px", "em", "ex", "ch", "rem", "mm", "cm", "in", "pt", "pc", "%"
+    ]);
+  },
+  length: function () {
+    return make.number() + make.lengthUnit();
+  },
+  percent: function () {
+    return make.number() + "%";
+  },
+};