diff --git a/Conversions/OctToDecimal.js b/Conversions/OctToDecimal.js
new file mode 100644
index 000000000..b2b3a4aa0
--- /dev/null
+++ b/Conversions/OctToDecimal.js
@@ -0,0 +1,15 @@
+function octalToDecimal (num) {
+    let dec = 0
+    let base = 1
+    while (num > 0) {
+      const r = num % 10
+      num = Math.floor(num / 10)
+      dec = dec + (r * base)
+      base = base * 8
+    }
+    return dec
+  }
+
+// test cases
+console.log(octalToDecimal(56) === 46)
+console.log(octalToDecimal(2365) === 1269)
\ No newline at end of file