Convert Ergs to Watt-hours
1 erg equals 2.777777778 × 10⁻¹¹ watt-hours (Wh).
1 erg = 2.777777778e-11 Wh
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk erg to watt-hour converter to paste a column from Excel.
How to Convert Erg to Watt-hour
- 1 erg = 2.777777778 × 10⁻¹¹ Wh
- 1 Wh = 36000000000 erg
- Example: convert 15 erg to Wh: 15 erg = 15 × 2.777777778 × 10⁻¹¹ Wh = 4.166666667 × 10⁻¹⁰ Wh
Formula
Wh = erg ÷ 36000000000
Derivation from SI units:
- 1 erg = 1 dyn·cm = 10⁻⁷ J
- 1 Wh = 1 W × 3600 s = 3600 J
- 1 erg = 1 × 10⁻⁷ J ÷ 3600 J per Wh = 2.777777777778 × 10⁻¹¹ Wh
Both units are defined exactly, so the factor is exact. Erg definition: erg; Watt-hour definition: watt-hour.
Worked examples
- A reading of 1000 erg converts to 2.777777778 × 10⁻⁸ Wh.
1000 erg × 2.777777778 × 10⁻¹¹ = 2.777777778 × 10⁻⁸ Wh - A value of 1e6 erg is 0.00002777777778 Wh.
1e6 erg × 2.777777778 × 10⁻¹¹ = 0.00002777777778 Wh
Erg to Watt-hour conversion table
| Ergs (erg) | Watt-hours (Wh) |
|---|---|
| 1 erg | 2.777777778 × 10⁻¹¹ Wh |
| 10 erg | 2.777777778 × 10⁻¹⁰ Wh |
| 100 erg | 2.777777778 × 10⁻⁹ Wh |
| 1000 erg | 2.777777778 × 10⁻⁸ Wh |
| 10000 erg | 2.777777778 × 10⁻⁷ Wh |
| 1e5 erg | 0.000002777777778 Wh |
| 1e6 erg | 0.00002777777778 Wh |
| 1e7 erg | 0.0002777777778 Wh |
| 1e10 erg | 0.2777777778 Wh |
| 3.828e33 erg | 1.063333333 × 10²³ Wh |
Where it's used
Ergs are used for astrophysics (luminosities in erg/s), 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.
Erg to other energy units
| Conversion | 1 erg equals |
|---|---|
| erg to joule | 1 × 10⁻⁷ J |
| erg to kilojoule | 1 × 10⁻¹⁰ kJ |
| erg to megajoule | 1 × 10⁻¹³ MJ |
| erg to calorie | 2.390057361 × 10⁻⁸ cal |
| erg to kilocalorie | 2.390057361 × 10⁻¹¹ kcal |
| erg to watt-hour | 2.777777778 × 10⁻¹¹ Wh |
| erg to kilowatt-hour | 2.777777778 × 10⁻¹⁴ kWh |
| erg to BTU | 9.478171203 × 10⁻¹¹ BTU |
| erg to therm | 9.48043428 × 10⁻¹⁶ thm |
| erg to electronvolt | 624150907400 eV |
| erg to foot-pound | 7.375621493 × 10⁻⁸ ft·lbf |
Frequently asked questions
How many watt-hours are in 1 erg?
1 erg = 2.777777778 × 10⁻¹¹ Wh.
How do I convert ergs to watt-hours?
Multiply the value in erg by 2.777777778 × 10⁻¹¹, or divide it by 36000000000. For example, 15 erg × 2.777777778 × 10⁻¹¹ = 4.166666667 × 10⁻¹⁰ Wh.
Is the erg to Wh conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- 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, "erg (erg)".
- 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 Ergs to Watt-hours. Retrieved October 17, 2026, from https://scientificconverters.com/energy/ergs-to-watt-hours/
IEEE
Scientific Converters, "Convert Ergs to Watt-hours," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/ergs-to-watt-hours/