Online Calculator
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History
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A free online calculator for everyday math, with no sign-up. Every result goes into a history, so you can reuse it in the next calculation, here or in another calculator.
Popular calculators
- Scientific Calculatorfunctions, powers and parentheses
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- Average Calculatoraverage a list of numbers
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Calculators by topic
Why 33calculators
- Each task gets its own calculator. Percentages, fractions, dates and pace aren't squeezed into one generic form.
- A result carries over to the next calculation. Take 15% of 240 in the Percentage Calculator and you get 36. Tap Use to send 36 to the Fraction Calculator, put 48 under it, and 36/48 becomes 3/4.
- It's free and needs no account. Your calculations stay in your browser.
Free online calculator
This free online calculator is a basic calculator online: add, subtract, multiply, divide, take a percentage, flip a number's sign with ±. It follows the order of operations, so × and ÷ go before + and −. Results show up to 12 significant digits. Decimals come out clean: 0.1 + 0.2 gives 0.3, with no floating-point tail. Divide by zero and you'll see "Can't divide by 0".
That's all it does. Need parentheses, powers or functions? Open the Scientific Calculator. For a percentage of a number there's the Percentage Calculator, and for fractions the Fraction Calculator.
How to use the calculator online
Tap the keys on screen, or type on your computer keyboard: digits, + - * /, % and a period (a comma works as a period too). Enter or = calculates. Backspace deletes, Escape or Delete clears.
- Order of operations: 2 + 3 × 4 = 14, because 3 × 4 is worked out first.
- Made a typo? ⌫ removes the last character. C clears the expression and the display, but your history stays.
- Percent works the way it does on a phone calculator: 50 + 10% = 55, and 200 − 15% = 170. On its own, % divides the number by 100.
- After =, press an operation to keep going from the result. Type a digit instead and a new calculation starts.
Reuse a result in the next calculation
Each time you press =, the calculation and its result go into the history. Every result has a Use button. It sends the number to this calculator or to another one: Percentage, Fraction or Scientific. On a computer or tablet, the History panel sits next to the calculator. On a phone, tap the history line.
History stays while the tab is open, even as you move between calculators. The numbers you enter are not sent anywhere.
FAQ
Is this online calculator free?
Yes. It's a free online calculator with no sign-up and nothing to install.
How do I use the calculator online?
Tap the keys or type on your keyboard, then press = or Enter. Order of operations, corrections and percentages are covered in How to use the calculator online above.
Is there a more advanced calculator?
Yes. For an online advanced calculator, open the Scientific Calculator: it adds functions, powers and parentheses.
Can I use a basic calculator online without installing anything?
Yes. This free basic calculator online runs in the browser on your phone or computer, and it has its own keypad, so your phone's keyboard doesn't pop up.