diff --git a/lib/index.js b/lib/index.js
index bc7c436..af2438e 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -253,13 +253,13 @@ GitStats.calendar = function (data, callback) {
             }
         });
 
-        levels = Math.ceil(cal.max / (LEVELS.length * 3));
+        levels = cal.max / (LEVELS.length * 2);
         days.forEach(function (c) {
             cDay = graph[c];
             cal.days[c] = {
                 c: cDay.c
               , level: !levels
-              ? 0 : (cLevel = Math.floor(cDay.c / levels )) >= 5
+              ? 0 : (cLevel = Math.round(cDay.c / levels)) >= 4
               ? 4 : !cLevel && cDay.c > 0 ? 1 : cLevel
             };
         });