Basic Calculator
Use a basic calculator for the four arithmetic operations, percentages, keyboard input, and a short calculation history.
On this page
Basic calculations
This calculator handles addition, subtraction, multiplication, and division. Enter a number, choose an operation, enter the next number, and press =. AC clears the current calculation. Backspace removes the last digit, and the sign button changes a positive entry to negative or back again.
Percent and display behavior
The percent key changes the current entry to one hundredth of its value: 25 becomes 0.25. It is a direct percentage conversion, not a special discount or tax calculation. Results are rounded during calculation to about 12 significant digits. Very large or very small results may be shown in exponential notation.
History and keyboard input
Completed equations are kept in the history tape, up to 20 entries. Click an entry to use its result again, or use Clear to remove the history. Keyboard input supports the number keys, +, -, *, /, Enter, Backspace, Escape, percent, and the decimal key. Division by zero produces an error instead of a numeric result.