Press the power button
Use the AC/On key if it has one
Close the calculator app on a phone or computer
Remove the batteries if it is a physical calculator with no power button
Let it auto shut off after inactivity if it has no manual off option
Press the power button
Use the AC/On key if it has one
Close the calculator app on a phone or computer
Remove the batteries if it is a physical calculator with no power button
Let it auto shut off after inactivity if it has no manual off option