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Metrology toolkit · unit conversion

Precision unit conversion, built for the workbench.

A focused engineering converter with SI-referenced calculations, explicit scope notes, and display precision you control.

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Unit conversion

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Based on BIPM and NIST references
Converted result LIVE
25.4mm
1 in = 25.4 mm
Display precision
Base unitmetre (m)
MethodConversion through a common base unit
Scope note

The international inch is defined as exactly 25.4 millimetres.

Reference basis

SI prefixes and the exact international inch (0.0254 m); foot, yard, and mil are derived from that definition.

BIPMThe International System of Units (SI), 9th edition, version 4.01NISTNIST SP 811, Appendix B.8 — Conversion FactorsNISTNIST SP 811 — Conversion-factor footnotes

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