That's usually caused by mouse drivers in your PC running in the background that alter the raw mouse data. I don't think there's a way to calculate that since we don't know what drivers are running and what Windows mouse settings are on. From a mathematical perspective it may be possible to measure the distance moved by the mouse to make one 360 both in direct connection and through PC, then draw a ratio between them to get the number, but I don't have an easy way to do that unfortunately.

Oh ok i didnt know if it was something wrong with my keymander but thanks anyways