Rounding Calculator
Enter a number and pick a place value below to instantly round it.
The Rounding Rule
If the digit after the rounding place is 5 or more, round up; otherwise, round down.
Worked example
Round 47.386 to the nearest hundredth.
The thousandths digit is 6, which is ≥ 5, so round up.
Result: 47.39
A second example
Round 2,384 to the nearest hundred.
The tens digit is 8, which is ≥ 5, so round up.
Result: 2,400
Keep going
- Rounding to a set number of significant figures is often the step right before writing a number in scientific notation; the scientific notation calculator picks up from there. Scientific Notation Calculator
- Rounding changes a number's digits without changing its place-value structure; the expanded form calculator shows exactly which place each digit occupies. Expanded Form Calculator
- Rounding always targets a specific place value column; the place value chart lines up every digit under its column name so it's clear exactly which one you're rounding to. Place Value Chart Calculator
Frequently Asked Questions
What is the rule for rounding?
Look at the digit immediately to the right of the place you're rounding to. If it's 5 or more, round the target digit up; if it's 4 or less, leave it as is — then drop everything after it.
How do you round to the nearest tenth?
Look at the hundredths digit. 47.386 rounded to the nearest tenth looks at the 8 (≥5), rounding up to 47.4.
How do you round to the nearest 10 or 100?
Divide by 10 (or 100), round to the nearest whole number, then multiply back by 10 (or 100). This is the same rule applied one place value higher.
What is 'round half to even' (banker's rounding)?
It's an alternative rule used in finance and programming: when the digit being dropped is exactly 5 with nothing after it, round to whichever neighbor is even instead of always rounding up. It reduces upward bias when rounding many numbers repeatedly. The standard "round half up" rule (always round 5 up), used here, is what most math classes teach.
What's a common rounding mistake?
Rounding in two steps instead of one — for example, rounding 2.449 to the nearest hundredth first (2.45), then rounding that result to the nearest tenth (2.5). Rounding straight from the original number gives 2.4, since the hundredths digit is only 4. Always round directly from the original, full number.
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