The electron mass in MeV/c², grams and other units
The electron mass is measured, with a relative uncertainty of about 0.3 parts per billion. Converting kilograms to MeV/c² uses only exact factors (c and e), so the converted values keep that uncertainty.
= 9.109 383 7139(28) × 10−31 kg about this constant →
| Unit | Value | |
|---|---|---|
| MeV/c2 megaelectronvolts per c² | 0.510 998 950 69 | |
| keV/c2 kiloelectronvolts per c² | 510.998 950 69 | |
| eV/c2 electronvolts per c² | 510 998.950 69 | |
| g grams | 9.109 383 7139 × 10−28 |
How it is computed: mₑ × c² ÷ (1.602 176 634 × 10⁻¹³ J/MeV) = 0.510 998 950 69.
All values computed from the CODATA 2022 value and unit definitions (SI Brochure, NIST SP 811). Exact values are rounded only for display. Checks.
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