Rounding Calculator
Last updated: July 2026
Round a number to a selected number of decimal places and compare floor, ceiling and truncation.
Rounded value
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- Rounded to nearest integer: —
- Rounded down at selected precision: —
- Rounded up at selected precision: —
- Truncated at selected precision: —
On this page
Quick summary: Round a number to a selected number of decimal places and compare floor, ceiling and truncation. Enter the values, calculate, review the result, and compare another realistic scenario when useful.
Read the complete guide
What this calculator estimates
Round a number to a selected number of decimal places and compare floor, ceiling and truncation. The calculation runs locally in your browser and is intended for quick reference and comparison.
How to use it
Enter the requested values, select Calculate, review the headline result and supporting figures, then change one input at a time to compare another scenario.
How the calculation works
Scale the number by 10 raised to the requested decimal places, apply the selected rounding operation, then scale it back.
Important limitations
Binary floating-point arithmetic can create tiny representation effects for certain decimal values.
Frequently asked questions
Is the result exact?
The calculator follows the stated formula and rounds only for display. Results can still depend on the quality and meaning of the values you enter.
Can I compare different scenarios?
Yes. Change one input at a time to see how it affects the result.
Does the calculator store my inputs?
The calculation runs in your browser and does not require an account. Avoid entering unnecessary confidential information.