Convert Watt-hours to Ergs
1 watt-hour (Wh) equals 36000000000 ergs (erg).
1 Wh = 36000000000 erg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk watt-hour to erg converter to paste a column from Excel.
How to Convert Watt-hour to Erg
- 1 Wh = 36000000000 erg
- 1 erg = 2.777777778 × 10⁻¹¹ Wh
- Example: convert 15 Wh to erg: 15 Wh = 15 × 36000000000 erg = 540000000000 erg
Formula
erg = Wh × 36000000000
Derivation from SI units:
- 1 Wh = 1 W × 3600 s = 3600 J
- 1 erg = 1 dyn·cm = 10⁻⁷ J
- 1 Wh = 3600 J ÷ 1 × 10⁻⁷ J per erg = 36000000000 erg
Both units are defined exactly, so the factor is exact. Watt-hour definition: watt-hour; Erg definition: erg.
Worked examples
- A reading of 20 Wh converts to 720000000000 erg.
20 Wh × 36000000000 = 720000000000 erg - A value of 100 Wh is 3600000000000 erg.
100 Wh × 36000000000 = 3600000000000 erg
Watt-hour to Erg conversion table
| Watt-hours (Wh) | Ergs (erg) |
|---|---|
| 1 Wh | 36000000000 erg |
| 5 Wh | 180000000000 erg |
| 10 Wh | 360000000000 erg |
| 15 Wh | 540000000000 erg |
| 20 Wh | 720000000000 erg |
| 50 Wh | 1800000000000 erg |
| 60 Wh | 2160000000000 erg |
| 75 Wh | 2700000000000 erg |
| 100 Wh | 3600000000000 erg |
| 160 Wh | 5760000000000 erg |
| 500 Wh | 18000000000000 erg |
| 1000 Wh | 36000000000000 erg |
Where it's used
Watt-hours are used for battery capacity (phone ≈ 15 Wh; airline limit 100 Wh per power bank), while ergs appear in astrophysics (luminosities in erg/s). Both measure energy, work and heat, so the conversion is a fixed factor.
Watt-hour to other energy units
| Conversion | 1 Wh equals |
|---|---|
| watt-hour to joule | 3600 J |
| watt-hour to kilojoule | 3.6 kJ |
| watt-hour to megajoule | 0.0036 MJ |
| watt-hour to calorie | 860.4206501 cal |
| watt-hour to kilocalorie | 0.8604206501 kcal |
| watt-hour to kilowatt-hour | 0.001 kWh |
| watt-hour to BTU | 3.412141633 BTU |
| watt-hour to therm | 0.00003412956341 thm |
| watt-hour to electronvolt | 2.246943267 × 10²² eV |
| watt-hour to foot-pound | 2655.223737 ft·lbf |
| watt-hour to erg | 36000000000 erg |
Frequently asked questions
How many ergs are in 1 watt-hour?
1 Wh = 36000000000 erg.
How do I convert watt-hours to ergs?
Multiply the value in Wh by 36000000000. For example, 15 Wh × 36000000000 = 540000000000 erg.
Is the Wh to erg conversion exact?
Yes. Both units are defined exactly, and 1 Wh is exactly 36000000000 erg.
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, "watt hour (W·h)".
- 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)".
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 Watt-hours to Ergs. Retrieved October 17, 2026, from https://scientificconverters.com/energy/watt-hours-to-ergs/
IEEE
Scientific Converters, "Convert Watt-hours to Ergs," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/watt-hours-to-ergs/