Metric conversion table

Primary source

Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.

Full Text

Inches Millimeters (mm) 1⁄8 3.2 1⁄4 6.4 3⁄8 9.5 1⁄2 12.7 5⁄8 15.9 3⁄4 19.1 7⁄8 22.2 1 25.4 11⁄4 31.8 11⁄2 38.1 13⁄4 44.5 2 50.8 21⁄2 63.5 23⁄4 69.9 3 76.2 31⁄2 88.9 4 101.6

eCFR data current as of: November 6, 2026

This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.