diff --git a/rainfall_conversion.py b/rainfall_conversion.py
new file mode 100644
index 0000000000000000000000000000000000000000..6df1e74c6478a3ae2283b1b1c0f79987c807700a
--- /dev/null
+++ b/rainfall_conversion.py
@@ -0,0 +1,3 @@
+def inches_to_mm(inches):
+	mm = inches * 25.4
+	 return mm