Click any constant cell below to copy the full-precision conversion factor to your clipboard.
1 [from] is ??? [to].
Hover a cell to see what it means (example format: 1 Hartree is 27.2 eV).
Type an energy in any unit to auto-fill the other units. Use the copy buttons to copy the computed values.
| Unit | Energy |
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Constants are constructed from NIST CODATA-recommended values (hartree, eV) and exact SI definitions (h, c, NA). Source: NIST Energy Equivalents.