diff --git a/306-controller_interface.X/app/kartculator.c b/306-controller_interface.X/app/kartculator.c
index 3b271b5..88a490b 100644
--- a/306-controller_interface.X/app/kartculator.c
+++ b/306-controller_interface.X/app/kartculator.c
@@ -21,7 +21,15 @@ void calcPosition(uint8_t joy_pos){
 }
 
 void calcSpeed(int32_t rpm) {
-    
+    int32_t calcSpeed;
+    if(rpm>=0){
+        calcSpeed = rpm;
+    } else {
+        calcSpeed = -rpm;
+    }
+    calcSpeed *= 1000;
+    calcSpeed /= KART_CST.CONTROL_SPEED_FACTOR;
+    eKart.speed = (uint8_t) calcSpeed;
 }
 
 int16_t getTorque() {