diff --git a/Games/Factorio/Mods/README.md b/Games/Factorio/Mods/README.md
index 5578a5c..bb3e233 100644
--- a/Games/Factorio/Mods/README.md
+++ b/Games/Factorio/Mods/README.md
@@ -7,3 +7,7 @@ https://mods.factorio.com/
 ## Free Factorio mods downloader
 
 Download mods without logging in to the official Factorio website/system: https://re146.dev/factorio/mods/en
+
+### Online rate/ratio calculator
+
+https://kirkmcdonald.github.io/