Convert Joules to Ergs
1 joule (J) equals 10000000 ergs (erg).
1 J = 10000000 erg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk joule to erg converter to paste a column from Excel.
How to Convert Joule to Erg
- 1 J = 10000000 erg
- 1 erg = 1 × 10⁻⁷ J
- Example: convert 15 J to erg: 15 J = 15 × 10000000 erg = 150000000 erg
Formula
erg = J × 10000000
Derivation from SI units:
- 1 J = 1 N·m = 1 W·s = 1 kg·m²·s⁻²
- 1 erg = 1 dyn·cm = 10⁻⁷ J
Both units are defined exactly, so the factor is exact. Joule definition: joule; Erg definition: erg.
Worked examples
- A reading of 250 J converts to 2500000000 erg.
250 J × 10000000 = 2500000000 erg - A value of 10000 J is 100000000000 erg.
10000 J × 10000000 = 100000000000 erg
Joule to Erg conversion table
| Joules (J) | Ergs (erg) |
|---|---|
| 1 J | 10000000 erg |
| 10 J | 100000000 erg |
| 100 J | 1000000000 erg |
| 250 J | 2500000000 erg |
| 500 J | 5000000000 erg |
| 1000 J | 10000000000 erg |
| 4184 J | 41840000000 erg |
| 10000 J | 100000000000 erg |
| 100000 J | 1000000000000 erg |
| 1000000 J | 10000000000000 erg |
| 3600000 J | 36000000000000 erg |
Where it's used
Joules are used for physics and engineering energy balances, while ergs appear in astrophysics (luminosities in erg/s). Both measure energy, work and heat, so the conversion is a fixed factor.
Joule to other energy units
| Conversion | 1 J equals |
|---|---|
| joule to kilojoule | 0.001 kJ |
| joule to megajoule | 0.000001 MJ |
| joule to calorie | 0.2390057361 cal |
| joule to kilocalorie | 0.0002390057361 kcal |
| joule to watt-hour | 0.0002777777778 Wh |
| joule to kilowatt-hour | 2.777777778 × 10⁻⁷ kWh |
| joule to BTU | 0.0009478171203 BTU |
| joule to therm | 9.48043428 × 10⁻⁹ thm |
| joule to electronvolt | 6.241509074 × 10¹⁸ eV |
| joule to foot-pound | 0.7375621493 ft·lbf |
| joule to erg | 10000000 erg |
Frequently asked questions
How many ergs are in 1 joule?
1 J = 10000000 erg.
How do I convert joules to ergs?
Multiply the value in J by 10000000. For example, 15 J × 10000000 = 150000000 erg.
Is the J to erg conversion exact?
Yes. Both units are defined exactly, and 1 J is exactly 10000000 erg.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
- 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 Joules to Ergs. Retrieved October 17, 2026, from https://scientificconverters.com/energy/joules-to-ergs/
IEEE
Scientific Converters, "Convert Joules to Ergs," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/joules-to-ergs/