Rounding
Round numbers using different methods and precision
How to use Rounding
- 1Enter the number you want to round and choose the target decimal places or significant figures.
- 2Pick a rounding rule such as round half up or round to even if offered.
- 3Read the rounded result and the digits that were kept.
Why rounding rules matter
Round to n decimals: keep n digits after the point, adjust the last kept digit by the nextRounding reduces noise from measurements that are not exact, but repeated rounding can drift results, so round only at the final step.
Different rules (half up versus round to even) handle the exact .5 case differently, which matters in statistics and finance.
Frequently asked questions
What is round half to even?
When the dropped part is exactly .5, round to the nearest even digit; this avoids bias when many .5 cases occur.
Should I round during each step?
No. Keep full precision while calculating and round only the final answer to avoid accumulating error.
What are significant figures?
They are the meaningful digits carried by a measurement's precision, counting from the first non-zero digit.