Basic Math · free · no sign-up
Rounding Calculator
Round any number to a chosen number of decimal places, from whole numbers to hundred-thousandths.
About the Rounding Calculator
Round any number to a chosen number of decimal places, from whole numbers to hundred-thousandths.
How to use the Rounding Calculator
- Enter the Number to Round.
- Choose the Decimal Places: 0 (whole), 1 (tenths), 2 (hundredths) and so on.
- Read the rounded value.
Formula and method
Look at the digit after the place you are rounding to. If it is 5 or more, round up; otherwise round down.
Worked example
3.14159 rounded to 2 decimal places is 3.14, and to 4 places is 3.1416. 1234.5678 to the nearest whole number is 1,235.
Tips
- Round only at the end of a calculation to avoid accumulating errors.
- Some systems round exact halves to the nearest even number (banker's rounding).
Frequently asked questions
How do I round 2.5?
Under the usual rule, 2.5 rounds up to 3. Banker's rounding would give 2.