electron-proton mass ratio

Document v1 · published by Koskamo · updated 2026-10-03

electron-proton mass ratio = 5.446 170 214 889 × 10⁻⁴ (CODATA 2022 recommended value, NIST)

Value: 5.446170214889e-4
Standard uncertainty: 9.4e-15 (relative 1.7 × 10⁻¹¹)
Unit: none (dimensionless)

Source and provenance

Original source: physics.nist.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: CODATA 2022 recommended values from NIST, a work of the US government (public domain in the United States)

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Keep the unit and stated uncertainty with the value. Records marked exact differ from measured values. The CODATA release is identified in the source; the document update date records publication on Koskamo.

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Version history

Published by Koskamo2026-10-03
Version 1