diff --git a/calculator.html b/calculator.html
index 8694920..17acdf2 100644
--- a/calculator.html
+++ b/calculator.html
@@ -9,6 +9,10 @@ function sin() {
 	var num = document.getElementById("n1");
 	num.value = Math.sin(num.value);
 }
+function fourth() {
+	var num = document.getElementById("n1");
+	num.value = Math.pow(num.value, 4);
+}
 </script>
 </head>
 <body>
@@ -17,5 +21,6 @@ Number:
 <input type="text" id="n1"><p>
 <button onclick="cube()"> x^3 </button>
 <button onclick="sin()"> sin(x) </button>
+<button onclick="fourth()"> x^4 </button>
 </body>
 </html>
