Add, subtract, multiply, or divide two numbers. Enter the numbers and choose an operation.
Usage Tip
Multiplying by a number between 0 and 1 makes a value smaller; dividing by one makes it larger.
Dividing by zero is undefined.
Results show up to six decimal places.
For multi-step expressions with mixed operations, use the order-of-operations calculator.
This calculator performs the four basic operations on two numbers. Division by zero is undefined and cannot be calculated, and subtracting a larger number from a smaller one gives a negative result. Percentages and decimals can be entered like any other number.
Results are shown with the precision of the calculator’s floating point arithmetic, so a sum like 0.1 plus 0.2 can display a tiny rounding difference in the last digits. For money, round to two decimal places at the end. When you need to combine more than two numbers in one calculation, remember that multiplication and division come before addition and subtraction.
Adding 12.5 and 7.25 gives 19.75, and subtracting 7.25 from 12.5 gives 5.25. Multiplying 12.5 by 4 gives 50, and dividing 50 by 8 gives 6.25. Dividing by a number between zero and one makes the result larger, so 10 divided by 0.5 is 20.
To check a result, do the reverse operation: a quotient multiplied by the divisor should return the dividend, and a sum minus one of the numbers should return the other. Estimating with rounded numbers first, such as 12 plus 7 for the example above, is a quick way to catch a misplaced decimal point.