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NIST-Style Rounding Helper
Round a measured value to the decimal place supported by its uncertainty and show the reported pair.
Privacy: This App does not send or save your entries. Do not enter passwords, codes, full account numbers, or private identifiers.
Enter your numbers
Enter only the details needed for this task. Check them against the original source.
Your result
Your result will appear here.
Engine self-test
Running golden cases…
Source notes
- National Institute of Standards and Technology — Guide for the Use of the International System of Units (SI), NIST Special Publication 811
NIST SP 811 documents rounding and significant-figure conventions for reported measurements.
Reviewed 2026-10-09. Individual journals and courses may specify their own reporting conventions. Follow the rule your work requires.
What this App does not do
This App rounds numbers you enter. It does not estimate uncertainty, check instruments, or apply journal-specific rules.
This free App has no paid features. It does not contact an agency, employer, bank, seller, provider, or other person.