diff --git a/src/store/index.js b/src/store/index.js
index e0b57b4..65f2feb 100644
--- a/src/store/index.js
+++ b/src/store/index.js
@@ -280,8 +280,12 @@ export default createStore({
                 }
 
                 if (field.data.percentDone <= 100) {
-                    let minutesLeft = moment.duration(moment(field.data.readyForHarvest).diff(moment())).asMinutes();
-                    field.data.percentDone = Number((Number(seed.cropData.timeToGrow) * 100) / Number(minutesLeft) - 100).toFixed(2);
+                    let minutesSincePlanting = moment.duration(moment().diff(field.data.planted)).asMinutes();
+                    field.data.percentDone =
+                        Number(
+                            Number(minutesSincePlanting) / Number(seed.cropData.timeToGrow) * 100
+                        ).toFixed(2);
+
                     if (field.data.percentDone >= 100) {
                         field.data.percentDone = 100;
                         field.data.canBeHarvested = true;