Rounding calculator
Round decimals, whole numbers, tens or hundreds. Choose precision and see how halfway values and negative numbers are rounded.
How do I use this page?
- Enter your data or use the example.
- Choose the method or precision and press Calculate.
- Review the result, explanation and details; you can copy the calculation.
What this page does not do: Decimal rounding from the exact input text, up to 100 input digits. This differs from choosing significant figures. It does not use bankers rounding (ties to even).
Further reading
Theory — how does rounding work?
When the first discarded digit is below 5, the last kept digit stays the same, while a digit of 5 or more increases its absolute value by one. Halfway values round away from zero, so 1.005 rounded to two decimals gives 1.01, and -1.005 gives -1.01. The calculator lets you round a number to a chosen precision, whether decimals, whole numbers, tens or hundreds, and shows the rule it applied.
Frequently asked questions
How do I read the result?
What are the limitations?
See also
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