Convert Electronvolts to Watt-hours
1 electronvolt (eV) equals 4.45049065 × 10⁻²³ watt-hours (Wh).
1 eV = 4.45049065e-23 Wh
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk electronvolt to watt-hour converter to paste a column from Excel.
How to Convert Electronvolt to Watt-hour
- 1 eV = 4.45049065 × 10⁻²³ Wh
- 1 Wh = 2.246943267 × 10²² eV
- Example: convert 15 eV to Wh: 15 eV = 15 × 4.45049065 × 10⁻²³ Wh = 6.675735975 × 10⁻²² Wh
Formula
Wh = eV × 4.45049065 × 10⁻²³
or Wh = eV ÷ 2.246943266806 × 10²²
Derivation from SI units:
- 1 eV = e × 1 V = 1.602176634 × 10⁻¹⁹ J (exact since 2019)
- 1 Wh = 1 W × 3600 s = 3600 J
- 1 eV = 1.602176634 × 10⁻¹⁹ J ÷ 3600 J per Wh = 4.45049065 × 10⁻²³ Wh
Both units are defined exactly, so the factor is exact. Electronvolt definition: electronvolt; Watt-hour definition: watt-hour.
Worked examples
- A reading of 1.5 eV converts to 6.675735975 × 10⁻²³ Wh.
1.5 eV × 4.45049065 × 10⁻²³ = 6.675735975 × 10⁻²³ Wh - A value of 13.6 eV is 6.052667284 × 10⁻²² Wh.
13.6 eV × 4.45049065 × 10⁻²³ = 6.052667284 × 10⁻²² Wh
Electronvolt to Watt-hour conversion table
| Electronvolts (eV) | Watt-hours (Wh) |
|---|---|
| 0.025 eV | 1.112622663 × 10⁻²⁴ Wh |
| 1 eV | 4.45049065 × 10⁻²³ Wh |
| 1.12 eV | 4.984549528 × 10⁻²³ Wh |
| 1.5 eV | 6.675735975 × 10⁻²³ Wh |
| 2 eV | 8.9009813 × 10⁻²³ Wh |
| 3 eV | 1.335147195 × 10⁻²² Wh |
| 10 eV | 4.45049065 × 10⁻²² Wh |
| 13.6 eV | 6.052667284 × 10⁻²² Wh |
| 100 eV | 4.45049065 × 10⁻²¹ Wh |
| 1000 eV | 4.45049065 × 10⁻²⁰ Wh |
| 1000000 eV | 4.45049065 × 10⁻¹⁷ Wh |
Where it's used
Electronvolts are used for atomic and particle physics, while watt-hours appear in battery capacity (phone ≈ 15 Wh; airline limit 100 Wh per power bank). Both measure energy, work and heat, so the conversion is a fixed factor.
Electronvolt to other energy units
| Conversion | 1 eV equals |
|---|---|
| electronvolt to joule | 1.602176634 × 10⁻¹⁹ J |
| electronvolt to kilojoule | 1.602176634 × 10⁻²² kJ |
| electronvolt to megajoule | 1.602176634 × 10⁻²⁵ MJ |
| electronvolt to calorie | 3.829294058 × 10⁻²⁰ cal |
| electronvolt to kilocalorie | 3.829294058 × 10⁻²³ kcal |
| electronvolt to watt-hour | 4.45049065 × 10⁻²³ Wh |
| electronvolt to kilowatt-hour | 4.45049065 × 10⁻²⁶ kWh |
| electronvolt to BTU | 1.518570443 × 10⁻²² BTU |
| electronvolt to therm | 1.518933028 × 10⁻²⁷ thm |
| electronvolt to foot-pound | 1.181704842 × 10⁻¹⁹ ft·lbf |
| electronvolt to erg | 1.602176634 × 10⁻¹² erg |
Frequently asked questions
How many watt-hours are in 1 electronvolt?
1 eV = 4.45049065 × 10⁻²³ Wh.
How do I convert electronvolts to watt-hours?
Multiply the value in eV by 4.45049065 × 10⁻²³, or divide it by 2.246943267 × 10²². For example, 15 eV × 4.45049065 × 10⁻²³ = 6.675735975 × 10⁻²² Wh.
Is the eV to Wh conversion exact?
Yes. Both units are defined exactly, and 1 eV is exactly 4.45049065 × 10⁻²³ Wh.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 and the fixed elementary charge e.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "watt hour (W·h)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Electronvolts to Watt-hours. Retrieved October 17, 2026, from https://scientificconverters.com/energy/electronvolts-to-watt-hours/
IEEE
Scientific Converters, "Convert Electronvolts to Watt-hours," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/electronvolts-to-watt-hours/