Rounding Calculator
Round a number to a selected number of decimal places
Rounded value
How we calculated it
About the Rounding Calculator
Rounding replaces a number with a nearby value at a chosen precision. It is useful for reporting, measurement and presentation, but rounding too early can distort later calculations.
The place value matters: rounding to two decimal places is different from rounding to two significant figures.
How to Use the Rounding Calculator
- Enter the number to be rounded.
- Choose the target decimal place, whole-number place or significant-figure rule.
- Calculate the rounded result.
- Keep extra digits during intermediate calculations and round only the final answer when accuracy matters.
How the Calculation Works
Standard half-up style rounding examines the first discarded digit. If it is 5 or greater, the retained digit is increased; otherwise it remains unchanged.
Significant-figure rounding counts meaningful digits from the first non-zero digit, while decimal-place rounding counts positions after the decimal point.
Worked example
Rounding Calculator Worked Example
Round 12.746 to two decimal places
Keep 12.74 and inspect the next digit, 6. Because 6≥5, increase the hundredths digit from 4 to 5. The rounded result is 12.75.
Result guide
Understanding Your Rounding Calculator Result
Rounding changes representation and can slightly change value. The more aggressively a number is rounded, the more precision is discarded.
Before you rely on the answer
Assumptions and Limitations
- The selected rounding rule matches the intended convention.
- Precision is specified clearly as decimal places or significant figures.
- Special financial or statistical rounding conventions may use different tie-breaking rules.
Practical tip
Using This Result in Practice
Avoid repeatedly rounding values that will be reused. Keep the full internal value and round once for the final displayed result.
Related calculations
Useful Calculations to Continue With
If the target is a specific number of meaningful digits rather than decimal places, use the Significant Figures Calculator.
If the number is being reformatted into powers of ten rather than merely rounded, use the Scientific Notation Calculator.
Common questions
Rounding Calculator FAQ
What is the difference between decimal places and significant figures?
Decimal places count digits after the decimal point; significant figures count meaningful digits from the first non-zero digit.
Why should I round only at the end?
Early rounding can compound through later calculations and produce a less accurate final result.
Does every field use the same rule for a trailing 5?
No. Some systems use half-even or other tie-breaking conventions instead of always rounding 5 upward.