Measuring force with Arduino and Matlab

I have a calibration problem with the following code. This code accesses an Arduino. The Arduino is in turn connected to a force sensor via an amplifier. The aim of the Matlab code is that when a known weight is placed on the force sensor, for example 3kg, the value is displayed in Matlab as 30 Newtons via the Arduino.

Matlab displays values between -1030 and -1020 as the zero point for the measurement. With Arduino, the values on the serial monitor for the zero point fluctuate between 267-269.

The aim is to set Matlab to zero and to display 30 newtons in Matlab when, for example, 3 kg is applied.

The following voltages were determined via Manuware when different weights were applied to the force sensor:

kg Volt

1 0,06

3 0,18

4 0,23

5 0,3

6 0,39

7 0,44

8 0,46

9 0,52

10 0,6