learning · free Companion App · local in this browser
SI Prefix Conversion Check
Convert a value between two SI prefixes and show the base-unit value and the factor between the units.
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 2026-10-10. Individual journals and courses may specify their own reporting conventions. Follow the rule your work requires.
What this App does not do
This App multiplies and divides by the factors you enter. It does not look up the prefix table, check that your units match, or judge a measurement.
This free App has no paid features. It does not contact an agency, employer, bank, seller, provider, or other person.