About this tool
Enter a number and choose how to round it: standard rounding, floor, ceiling, round-half-up, or to the nearest multiple. The relevant options appear for each mode and the result updates live in your browser.
Frequently asked questions
How does round-half-up differ from standard round?
Standard rounding follows JavaScript's rule for ties, while round-half-up always rounds a .5 away from zero, so 2.5 becomes 3 and −2.5 becomes −3.
What is nearest-multiple rounding?
It rounds the number to the closest multiple of a value you choose — for example rounding 47 to the nearest multiple of 5 gives 45.