A little math. A clear answer.
Work through everyday numbers with roomy buttons, keyboard support, and a handy recent history.
Simple instructions and useful answers, so you can get on with your day.
Use the online calculator
This calculator handles addition, subtraction, multiplication, division, decimals, signs, and percentages. It works like a basic desktop calculator: enter a number, choose an operation, enter the next number, and press equals. Large buttons make it comfortable to use on a phone or computer.
- Enter the first number using the buttons or your keyboard.
- Choose +, −, ×, or ÷.
- Enter the second number and select equals to show the result.
- Continue from that result, or use AC to start a fresh calculation.
Calculations run one step at a time
When you chain operations, this calculator completes each step as you select the next operation. For example, entering 2 + 3 × 4 gives 20: first 2 + 3 becomes 5, then 5 × 4 becomes 20. It does not apply expression precedence or accept parentheses.
To work through an expression with multiplication before addition, calculate the multiplication separately, then add the remaining number. For 2 + 3 × 4, calculate 3 × 4 = 12, then 12 + 2 = 14. The recent history helps you follow those intermediate results.
How the percent button works
Used by itself, percent divides the displayed number by 100. Entering 50 and then % gives 0.5. During addition or subtraction, percent uses the first number as its base: 120 + 10 % = gives 132, and 120 − 10 % = gives 108.
For multiplication and division, the percent button converts the second number to a decimal. For example, 120 × 10 % = gives 12. These conventions make it easy to add a percentage or find a portion of a number without typing the decimal conversion yourself.
Keyboard controls and corrections
Type digits and a decimal point, and use +, −, *, or / for operations. Enter or = calculates the answer. Backspace removes the last entered digit. Escape or Delete clears the current calculation. The ± button changes the sign of the displayed number.
What happens if I press equals again?
The calculator repeats the last operation with the same second number. After 10 + 2 = gives 12, another press of equals gives 14.
How precise are the results?
Results are rounded to 12 significant digits. Very large values may use scientific notation. Division by zero and results outside the supported numeric range show an error. Clear the display or enter a new number to continue.
Is my calculation history saved?
Recent completed calculations stay in this open tab. You can clear that history separately; reloading the page starts a new session.