diff --git a/pendulum/main.js b/pendulum/main.js
index 2599abc8..dc8e07d6 100644
--- a/pendulum/main.js
+++ b/pendulum/main.js
@@ -277,6 +277,6 @@ function handleClick(event)
         helper.sub(centerMass);
         theta = helper.angleBetween(createVector(0, -1));
 
-        document.getElementById("inst").innerHTML = "Mass: " + m + " M --- Moment of inertia: " + inertia.toFixed(3) + " ML²";
+        document.getElementById("inst").innerHTML = "Mass: " + m.toFixed(3) + " M --- Moment of inertia: " + inertia.toFixed(3) + " ML²";
     }
 }
\ No newline at end of file