Electronvolts to Watt-hours Converter
Common Conversions
| eV | Wh |
|---|---|
| 1 | 4.451e-23 |
| 10 | 4.451e-22 |
| 100 | 4.451e-21 |
| 1000 | 4.451e-20 |
| 1000000 | 4.451e-17 |
| 1000000000 | 4.451e-14 |
| 1000000000000 | 4.451e-11 |
| 1000000000000000 | 4.451e-8 |
| 1000000000000000000 | 0.00004451 |
| 1e+21 | 0.04451 |
| 1e+22 | 0.4451 |
| 2.247e+22 | 1 |
Why this conversion matters in chemistry
An electronvolt is one electron's charge moved through one volt — a vanishingly small amount of energy at any practical scale. The conversion to watt-hours falls out of two facts: 1 eV = 1.602 × 10⁻¹⁹ J, and 1 Wh = 3600 J. Dividing gives 4.4505 × 10⁻²³ Wh per eV. The conversion is mostly conceptual — it connects the atomic-scale unit of single-particle energy with the unit you read on a household electricity bill, and it underscores how many particles a kilowatt-hour worth of chemistry actually involves. A high-energy particle beam delivering TeV per particle still releases tiny energy per particle compared to a household appliance running for an hour.
Formula
Worked Examples
One electronvolt — the conversion anchor, vanishingly small at the macroscopic scale.
The number of single-eV events that add up to one watt-hour — a 22-zettaelectronvolt sum, useful as a sanity check on the prefix gap.
One keV — the photon energy range of soft X-ray and core-level spectroscopy.
The ionization energy of one hydrogen atom — the Rydberg energy, the foundational atomic-physics number.