emcalc is E=mc2 calculator, and not only calculating basic, calculating efficiency, to electric efficiency and more!
1: windows + r type: cmd
2: winget update
3: winget install python3
4: winget install git
5: cd %USERPROFILE%\Desktop
6: git clone https://github.com/emcalc/emcalc
7: python3 emcalc.py
1: Python Installer: Install the 3.9 or later
2: setup the python
3: cd %USERPROFILE%\Desktop
4: git clone https://github.com/emcalc/emcalc
5 python3 emcalc.py
2: open the terminal
3: type: cd ~/Downloads/
4: type: chmod +x emcalc
5: type: ./emcalc or click the “emcalc” file