diff --git a/app/generative-energy/GECalculator.tsx b/app/generative-energy/GECalculator.tsx
index 1274d69..d15a05f 100644
--- a/app/generative-energy/GECalculator.tsx
+++ b/app/generative-energy/GECalculator.tsx
@@ -78,7 +78,7 @@ export default defineComponent({
                                                     if (_.name === "Grains") {
                                                         numGrains.value = val;
                                                     } else {
-                                                        numGrains.value = _.mpg / val;
+                                                        numGrains.value = val / _.mpg;
                                                     }
                                                 }}
                                                 min="0"