Online Calculator
Type a sum and get the answer: + − × ÷, brackets, powers, roots and percent.
Good to know. Brackets first, then powers, then × and ÷, then + and −. The calculator never forgets the order.
How it works
In plain words
Sums are worked out in the standard order: brackets, then powers and roots, then multiplication and division from left to right, then addition and subtraction. A percent after + or − is a percent of what comes before it, as on a pocket calculator.
The formula
order: ( ) → ^ √ → × ÷ → + − a + b% = a × (1 + b ÷ 100) a − b% = a × (1 − b ÷ 100)
Worked example
(12 + 8) × 3 is 20 × 3 = 60, and taking 10% off 60 leaves 54.
Sources
No outside data or rates: this is plain arithmetic.
4 automated tests check its answers on every change.
About the online calculator
Sometimes you just need to add things up. Type a sum the way you would write it and the answer appears as you type, without a keypad to tap through. Use + and − for adding and subtracting, × or * for multiplying, ÷ or / for dividing, and ^ for powers: 2^10 is 1,024.
The calculator follows the standard order of operations, so 2 + 3 × 4 is 14, not 20. Use brackets when you want something worked out first: (2 + 3) × 4 is 20. Brackets can be nested as deep as you like, and every opening bracket needs a closing one.
Percent works like the % key on a pocket calculator. On its own, 15% is 0.15. After a plus or minus, it means a percentage of what came before: 200 + 15% is 230, and 80 − 25% is 60. That makes adding tax or taking off a discount a single line.
For square roots, type √ or sqrt: √81 is 9 and sqrt(2) is 1.414… π, or pi, is 3.14159… The answer is shown to up to ten decimal places, and rounded to two below it for money. For fractions, percentages of a number or converting units, the dedicated calculators show the steps as well.
Questions people ask
Does it follow the order of operations?
Yes. Brackets first, then powers and roots, then × and ÷, then + and −. So 2 + 3 × 4 is 14.
How do I add a percentage?
Type the amount, a plus sign and the percentage: 200 + 15% gives 230. A minus takes it off: 80 − 25% gives 60.
How do I type a square root or a power?
Use √ or sqrt for roots, √81 = 9, and ^ for powers, 3^4 = 81.
Can I use a decimal comma?
Yes, if your region writes decimals with a comma. Change the region at the bottom of the page.