The Planck constant in eV·s, erg·s and other units
Since 2019 both h and the elementary charge are exact, so h in electronvolt seconds is exact too: h/e. NIST lists it as “Planck constant in eV/Hz”; eV/Hz and eV·s are the same unit.
= 6.626 070 15 × 10−34 J Hz−1 about this constant →
| Unit | Value | |
|---|---|---|
| eV·s electronvolt seconds | 4.135 667 696 92 × 10−15 | exact |
| meV·s millielectronvolt seconds | 4.135 667 696 92 × 10−12 | exact |
| erg·s erg seconds | 6.626 070 15 × 10−27 | exact |
| J·s joule seconds | 6.626 070 15 × 10−34 | exact |
| eV/Hz electronvolts per hertz | 4.135 667 696 92 × 10−15 | exact |
How it is computed: 6.626 070 15 × 10⁻³⁴ J s ÷ 1.602 176 634 × 10⁻¹⁹ J/eV = 4.135 667 696 92 × 10−15.
All values computed from the CODATA 2022 value and unit definitions (SI Brochure, NIST SP 811). Exact values are rounded only for display. Checks.
Other conversions
- Speed of light in mph, km/h and other units
- Gravitational constant G in CGS and other units
- Reduced Planck constant ħ in eV·s, MeV·fm and other units
- Boltzmann constant in eV/K and other units
- Gas constant R in L·atm/(mol·K), cal/(mol·K) and other units
- Electron mass in MeV/c², grams and daltons
- Elementary charge in statcoulombs (esu) and other units
- Standard gravity in ft/s², m/s² and other units
- Avogadro constant per pound-mole and other units