How to restore the non-functional calculator tool on the laptop?

Step 1: Go to setting and open the same and see the features.
Step 2: Click on Calculator app entry. The see the advanced options link and then click on that.
Step3; Then Storage usage and app reset page will open. Click on the Reset button.
Step4: A warning message will come and again click on the Reset button. The calculator will get reinstalled.

Before doing this you have to uninstall the previous Calculator program. For this, you have to use the PowerShell or t CCleaner.

It appears that your calculator app is not working properly. There are a few ways to tackle this problem. First method is to reset it and procedure for resetting is -
Open 'All Settings'.
Click on 'Apps'.
Click on 'Calculator' option.
Open 'Advanced Options'.
Click on 'Reset'.

Second method is run the SFC (System File Checker) or DISM (Deployment Image Servicing and Management) scan in your computer and after its completion just restart the computer. In many cases the problem will be solved.

Third method is that you can download it from the Microsoft site and install it in your computer. Last year, Microsoft had made available its Windows Calculator application on the GitHub platform as an open-source software. So, alternatively you can download it from the GitHub site also.