Updated: 04/30/2020 by Computer Hope

A calculator may refer to any of the following:

1. Calc is the name of the spreadsheet program used in OpenOffice.

Windows Calculator

2. An electronic hardware device or software capable of performing mathematical calculations such as addition, multiplication, subtraction, or division. The Casio Computer Company developed the first electronic calculator in 1957. Since then, calculators have come in many sizes, and are also built into most operating systems on computers, smartphones, and tablets. The picture is an example of the Calculator software program included in every version of Microsoft Windows.

How are numbers entered into a calculator?

On a computer to enter numbers into the calculator, use the numeric keypad. If the numeric keypad numbers are not working, press the Num Lock key. For laptops or computers without a numeric keypad, the numbers above the top row keys can be used.

Running the calculator

Users running Microsoft Windows can access the Windows calculator by following the steps below.

Windows 10 users

  1. Click the Start button.
  2. Click the All apps option.
  3. Click the Calculator utility.


  1. Press the shortcut keys Windows key + X.
  2. In the Power User Task Menu, click the Run option.
  3. Type calc and press Enter.

Windows 8 users

  1. From the Windows Start screen, type calc.

Windows 95 to Windows 7 users

  1. Click the Start button.
  2. In the Start menu, click All Programs or Programs.
  3. In the programs list, click the Accessories folder.
  4. Select the Calculator utility.


  1. Click the Start button.
  2. In the Start menu, click the Run option.
  3. Type calc and press Enter.

Windows Calculator tips


By default, the Windows Calculator is set to Standard mode. The mode can be changed by clicking View in the top menu, then choosing Scientific. The scientific mode gives the user more options and abilities.


In Windows 10, Calculator does not have a top menu. Instead, click the button with three horizontal lines stacked vertically, near the top left of the window, and select Scientific.


By default, digit grouping in the Windows Calculator is disabled. Enabling this feature causes your long numbers to have commas. For example, instead of 10000000, it would display as 10,000,000. To enable this feature, click View in the top menu and select the Digit grouping option.


In Windows 10, the Calculator uses digit grouping by default.

For Windows 7 and above users, Microsoft has included a much more sophisticated calculator. As shown below, several new features are highlighted and are not available in previous versions of Windows. Additional information and tips on this calculator is on our Windows 7 Calculator tips page.

Windows 7 calculator

Linux users

Users running Linux and Unix can run the bc command or dc command to open the calculator from the command line.

Abacus, Add, C button, CE button, Keypad, MC button, Software terms, Tabulator