UtilityBaseCalculators
Rounding Calculator
Round a number to the nearest whole, tenth, hundredth, ten, or significant figures.
Updated July 10, 2026
How to use the rounding calculator
- 1Enter the number you want to round.
- 2Read every common rounding at once.
- 3Find the nearest whole, tenth, hundredth, or ten.
- 4Check the significant-figure versions too.
Common uses
- Rounding to a required decimal place
- Estimating with round numbers
- Reporting a result to significant figures
- Checking rounding homework
Frequently asked questions
How does rounding work?
Look at the digit just to the right of the place you are rounding to. If it is 5 or more, round the target digit up; if it is 4 or less, leave it and drop the rest. So 3.14159 rounds to 3.1 at the tenth and 3.14 at the hundredth.
What are significant figures?
Significant figures are the meaningful digits of a number, counted from the first non-zero digit. Rounding 3.14159 to 3 significant figures gives 3.14; rounding 0.004567 to 2 gives 0.0046. Scientists use them to express how precise a measurement is.
Does it round half up or half to even?
This calculator uses round half up, the rule taught in most schools and used in everyday math. Some scientific and financial contexts use round half to even (banker's rounding) to reduce bias, which can differ on exact halves.
About this tool
The rounding calculator shows every common rounding of a number at once — to the nearest whole number, tenth, hundredth, and thousandth, to the nearest ten, hundred, and thousand, and to two or three significant figures. It uses the standard round-half-up rule: if the next digit is 5 or more, round up. Enter a value and read all the results side by side, handy for homework, estimates, and reporting numbers to a consistent precision. Everything is calculated in your browser.
Like most tools on UtilityBase, the rounding calculator runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more calculators here.
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