Rounding Calculator
Round any number to decimals, to the nearest 10 or 100, or straight up or down.
Rounded to 2 decimal places
3.14
How it works
Pick how you want to round. To a set number of decimals turns 3.14159 into 3.14 at two places. To the nearest N snaps a value onto a grid — nearest 10 sends 47 to 50, nearest 25 sends 63 to 75.
Rounding up (the ceiling) always moves toward the next whole number, so 4.1 becomes 5. Rounding down (the floor) always drops the fraction, so 4.9 becomes 4. These ignore the usual halfway rule and go one fixed direction.
The default decimal mode uses standard round-half-up, meaning a trailing 5 tips upward: 2.5 rounds to 3. Change the number or the mode and the answer refreshes right away.
Frequently asked questions
How does the calculator handle a number ending in 5?
In decimal mode it rounds half up, so 2.5 becomes 3 and 2.45 becomes 2.5. The ceiling and floor modes don't care about halves — they always push up or down respectively.
What does rounding to the nearest 10 or 100 do?
It snaps your value to the closest multiple of the step you choose. Nearest 100 turns 1,240 into 1,200 and 1,260 into 1,300. Handy for tidying up estimates and headline figures.
Is rounding up the same as ceiling?
They're the same idea. Ceiling always moves to the next whole number in the positive direction, while floor drops down to the whole number below. This calculator labels them so there's no ambiguity.