Convert Kilojoules to Ergs
1 kilojoule (kJ) equals 10000000000 ergs (erg).
1 kJ = 10000000000 erg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilojoule to erg converter to paste a column from Excel.
How to Convert Kilojoule to Erg
- 1 kJ = 10000000000 erg
- 1 erg = 1 × 10⁻¹⁰ kJ
- Example: convert 15 kJ to erg: 15 kJ = 15 × 10000000000 erg = 150000000000 erg
Formula
erg = kJ × 10000000000
Derivation from SI units:
- 1 kJ = 10³ J
- 1 erg = 1 dyn·cm = 10⁻⁷ J
- 1 kJ = 1000 J ÷ 1 × 10⁻⁷ J per erg = 10000000000 erg
Both units are defined exactly, so the factor is exact. Kilojoule definition: kilojoule; Erg definition: erg.
Worked examples
- A reading of 100 kJ converts to 1000000000000 erg.
100 kJ × 10000000000 = 1000000000000 erg - A value of 1000 kJ is 10000000000000 erg.
1000 kJ × 10000000000 = 10000000000000 erg
Kilojoule to Erg conversion table
| Kilojoules (kJ) | Ergs (erg) |
|---|---|
| 1 kJ | 10000000000 erg |
| 4.184 kJ | 41840000000 erg |
| 10 kJ | 100000000000 erg |
| 50 kJ | 500000000000 erg |
| 100 kJ | 1000000000000 erg |
| 250 kJ | 2500000000000 erg |
| 500 kJ | 5000000000000 erg |
| 840 kJ | 8400000000000 erg |
| 1000 kJ | 10000000000000 erg |
| 2000 kJ | 20000000000000 erg |
| 8700 kJ | 87000000000000 erg |
| 10000 kJ | 100000000000000 erg |
Where it's used
Kilojoules are used for nutrition labels (kJ per serving), while ergs appear in astrophysics (luminosities in erg/s). Both measure energy, work and heat, so the conversion is a fixed factor.
Kilojoule to other energy units
| Conversion | 1 kJ equals |
|---|---|
| kilojoule to joule | 1000 J |
| kilojoule to megajoule | 0.001 MJ |
| kilojoule to calorie | 239.0057361 cal |
| kilojoule to kilocalorie | 0.2390057361 kcal |
| kilojoule to watt-hour | 0.2777777778 Wh |
| kilojoule to kilowatt-hour | 0.0002777777778 kWh |
| kilojoule to BTU | 0.9478171203 BTU |
| kilojoule to therm | 0.00000948043428 thm |
| kilojoule to electronvolt | 6.241509074 × 10²¹ eV |
| kilojoule to foot-pound | 737.5621493 ft·lbf |
| kilojoule to erg | 10000000000 erg |
Frequently asked questions
How many ergs are in 1 kilojoule?
1 kJ = 10000000000 erg.
How do I convert kilojoules to ergs?
Multiply the value in kJ by 10000000000. For example, 15 kJ × 10000000000 = 150000000000 erg.
Is the kJ to erg conversion exact?
Yes. Both units are defined exactly, and 1 kJ is exactly 10000000000 erg.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- 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 Kilojoules to Ergs. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilojoules-to-ergs/
IEEE
Scientific Converters, "Convert Kilojoules to Ergs," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilojoules-to-ergs/