Using the Rounding Calculator
Use zero decimal places for the nearest integer. Use −2 to round to the nearest hundred. Decide the required reporting precision first rather than rounding after every intermediate step in a longer calculation.
Worked example
Use the example inputs below to reproduce this result. These are the form's starting values, not recommended targets. Changing your inputs updates your result above; this worked example stays fixed for comparison. Results are rounded for display.
Example inputs
- Number
- 123.4567
- Decimal places
- 2
Example result
- Rounded value
- 123.46
Method and assumptions
Rounds to the nearest place; exact ties follow JavaScript rounding toward positive infinity.
Avoid rounding too early
Keep the original measured or calculated value while working through intermediate steps. Rounding at each step can introduce differences that grow by the final result. When reporting an answer, distinguish the value from the precision you choose to display. A neatly rounded number is easier to read, but it does not make the original measurement more accurate.
Common question
What is the difference between decimal places and significant digits?
Decimal places count positions after the decimal point. Significant digits count meaningful digits starting with the first nonzero digit, so the two rules can produce different rounding.
Guide updated .