Calculator
A standard calculator for everyday arithmetic. Type an expression, including parentheses and percent, and the result updates as you go. Switch to the scientific calculator for trigonometry, logarithms, and powers.
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Formula
Multiplication and division happen before addition and subtraction. Parentheses happen first. Powers, when you use them on the scientific calculator, happen before multiplication. The expression stays on screen, so you can see 12 + 8 inside the parentheses instead of losing the steps as soon as you press an operator.
Percent depends on the operator in front of it. 50% is 0.5. 100 + 10% is 110, because the 10% is 10 percent of 100. 100 − 10% is 90. 200 × 10% is 20, and 100 ÷ 10% is 1,000. Put the percent in parentheses when you want that part divided by 100 before the rest of the expression runs. (100 + 10)% is 1.1.
The sign key changes the last number from positive to negative, or the other way. Ans pastes the last result you committed with the equals key. Memory is a single number held in this browser tab: MS stores the current result, M+ adds to it, M− subtracts, MR pastes it, and MC clears it. C clears the expression and leaves memory alone.
Nothing you type is sent to a server or saved in an account. Refreshing the page clears the expression and the memory. On a computer you can also type digits, operators, parentheses, and percent. Enter calculates, Backspace deletes, and Escape clears.
Parentheses, then × and ÷, then + and −. 100 + 10% = 100 + (100 × 10 / 100).
- ( ) Calculate the inside before the rest of the expression.
- × ÷ Multiplication and division, done before addition and subtraction.
- + − Addition and subtraction, done from left to right.
- % Percent of the number before + or −, or a number divided by 100 after × or ÷.
Worked example
Enter (12 + 8) × 3 − 10. The parentheses run first, so 12 + 8 is 20. Then 20 × 3 is 60. Then 60 − 10 is 50.
Enter 100 + 10%. Ten percent of 100 is 10, and 100 + 10 is 110. The same keys on 100 − 10% return 90.
FAQ
How does percent work on this calculator?
50% is 0.5. After addition or subtraction, percent is that percent of the other number: 100 + 10% is 110 and 100 − 10% is 90. After multiplication or division, the percent is divided by 100 first: 200 × 10% is 20.
Can I use the keyboard?
Yes. Type digits, +, -, *, /, parentheses, and %. Enter or = calculates, Backspace deletes the last key, and Escape clears the expression.
Is the calculation saved?
No. The expression and the memory number stay in the page until you refresh it or leave it. There is no account.
Where is the scientific calculator?
Use the Scientific switch above the keys. That page adds sine, cosine, tangent, logarithms, powers, roots, and factorials, with degrees, radians, and gradians.