diff --git a/Maths/digitSum.js b/Maths/digitSum.js
new file mode 100644
index 000000000..3f08cf807
--- /dev/null
+++ b/Maths/digitSum.js
@@ -0,0 +1,18 @@
+// program to find sum of digits of a number
+
+// function which would calculate sum and return it
+function digitSum (num) {
+  // sum will store sum of digits of a number
+  let sum = 0
+  // while will run untill num become 0
+  while (num) {
+    sum += (num % 10)
+    num = parseInt(num / 10)
+  }
+
+  return sum
+}
+
+// assigning number
+const num = 12345
+console.log(digitSum(num))