diff --git a/src/internal/apiservice/soil/moisture.go b/src/internal/apiservice/soil/moisture.go
index b555ce6..1c60cd9 100644
--- a/src/internal/apiservice/soil/moisture.go
+++ b/src/internal/apiservice/soil/moisture.go
@@ -82,7 +82,7 @@ func moisture() (types.Telemetry, error) {
 	// re-calculate to %
 	// 100 % := 3.0 V
 	//	0 % := 0.0 V
-	ret.Value = -0.03*ret.Value + 3
+	ret.Value = -33.333*ret.Value + 100
 	ret.Unit = "%"
 	return ret, nil
 }