Convert Ergs to Kilocalories
1 erg equals 2.390057361 × 10⁻¹¹ kilocalories (kcal).
1 erg = 2.390057361e-11 kcal
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk erg to kilocalorie converter to paste a column from Excel.
How to Convert Erg to Kilocalorie
- 1 erg = 2.390057361 × 10⁻¹¹ kcal
- 1 kcal = 41840000000 erg
- Example: convert 15 erg to kcal: 15 erg = 15 × 2.390057361 × 10⁻¹¹ kcal = 3.585086042 × 10⁻¹⁰ kcal
Reference conditions. kcal: Thermochemical kilocalorie (food Calorie), 4184 J exactly.
Formula
kcal = erg ÷ 41840000000
Derivation from SI units:
- 1 erg = 1 dyn·cm = 10⁻⁷ J
- 1 kcal = 1000 cal = 4184 J (exact)
- 1 erg = 1 × 10⁻⁷ J ÷ 4184 J per kcal = 2.390057361377 × 10⁻¹¹ kcal
Both units are defined exactly, so the factor is exact. Erg definition: erg; Kilocalorie definition: kilocalorie.
Worked examples
- A reading of 1000 erg converts to 2.390057361 × 10⁻⁸ kcal.
1000 erg × 2.390057361 × 10⁻¹¹ = 2.390057361 × 10⁻⁸ kcal - A value of 1e6 erg is 0.00002390057361 kcal.
1e6 erg × 2.390057361 × 10⁻¹¹ = 0.00002390057361 kcal
Erg to Kilocalorie conversion table
| Ergs (erg) | Kilocalories (kcal) |
|---|---|
| 1 erg | 2.390057361 × 10⁻¹¹ kcal |
| 10 erg | 2.390057361 × 10⁻¹⁰ kcal |
| 100 erg | 2.390057361 × 10⁻⁹ kcal |
| 1000 erg | 2.390057361 × 10⁻⁸ kcal |
| 10000 erg | 2.390057361 × 10⁻⁷ kcal |
| 1e5 erg | 0.000002390057361 kcal |
| 1e6 erg | 0.00002390057361 kcal |
| 1e7 erg | 0.0002390057361 kcal |
| 1e10 erg | 0.2390057361 kcal |
| 3.828e33 erg | 9.149139579 × 10²² kcal |
Where it's used
Ergs are used for astrophysics (luminosities in erg/s), while kilocalories appear in food and diet energy (2000 kcal reference intake). 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 kilocalories are in 1 erg?
1 erg = 2.390057361 × 10⁻¹¹ kcal.
How do I convert ergs to kilocalories?
Multiply the value in erg by 2.390057361 × 10⁻¹¹, or divide it by 41840000000. For example, 15 erg × 2.390057361 × 10⁻¹¹ = 3.585086042 × 10⁻¹⁰ kcal.
Is the erg to kcal 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, "kilocalorie (thermochemical)".
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 Kilocalories. Retrieved October 17, 2026, from https://scientificconverters.com/energy/ergs-to-kilocalories/
IEEE
Scientific Converters, "Convert Ergs to Kilocalories," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/ergs-to-kilocalories/