Change measurement settings from inches to centimeters and vice versa
To change system settings, do the following:
1. Open Control Panel.
See How to open Control Panel in Windows 10.
2. In the Control Panel dialog box, choose Change date, time, or number formats:

3. In the Region dialog box, choose Additional settings...:

4. In the Customize Format dialog box, change Measurement system:

5. Click OK or Apply and then OK.
See also this tip in French: Changer l'unités de mesure de pouces en centimètres et vice versa.