diff --git a/lib/canvas.js b/lib/canvas.js
index fb5ca74..5c6385f 100644
--- a/lib/canvas.js
+++ b/lib/canvas.js
@@ -471,6 +471,16 @@ Context2d.prototype.__defineSetter__('font', function(val){
     var font;
     if (font = parseFont(val)) {
       this.lastFontString = val;
+      
+      switch (font.unit) {
+        case 'pt':
+          font.size /= .75;
+          break;
+        case 'in':
+          font.size *= 96;
+          break;
+      }
+
       this.setFont(
           font.weight
         , font.style