diff --git a/Basics/factorial.js b/Basics/factorial.js
new file mode 100644
index 0000000..6d0e22d
--- /dev/null
+++ b/Basics/factorial.js
@@ -0,0 +1,17 @@
+function calculateFactorial() {
+  var n = document.getElementById("num").value;
+  var fact = 1;
+
+  if (n < 0) {
+    document.getElementById("result").innerHTML =
+      "Factorial not defined for negative numbers";
+    return;
+  }
+
+  for (var i = 1; i <= n; i++) {
+    fact = fact * i;
+  }
+
+  document.getElementById("result").innerHTML =
+    "Factorial of " + n + " is " + fact;
+}