Convert BTU to Ergs
1 British thermal unit (BTU) equals 10550558530 ergs (erg).
1 BTU = 10550558530 erg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BTU to erg converter to paste a column from Excel.
How to Convert BTU to Erg
- 1 BTU = 10550558530 erg
- 1 erg = 9.478171203 × 10⁻¹¹ BTU
- Example: convert 15 BTU to erg: 15 BTU = 15 × 10550558530 erg = 158258377900 erg
Reference conditions. BTU: International Table BTU (BTU_IT), 1055.05585262 J exactly.
Formula
erg = BTU × 10550558526.2
Derivation from SI units:
- 1 BTU_IT = 1055.05585262 J (exact)
- 1 erg = 1 dyn·cm = 10⁻⁷ J
- 1 BTU = 1055.05585262 J ÷ 1 × 10⁻⁷ J per erg = 10550558526.2 erg
Both units are defined exactly, so the factor is exact. BTU definition: British thermal unit; Erg definition: erg.
Worked examples
- A reading of 3412 BTU converts to 35998505690000 erg.
3412 BTU × 10550558530 = 35998505690000 erg - A value of 24000 BTU is 253213404600000 erg.
24000 BTU × 10550558530 = 253213404600000 erg
BTU to Erg conversion table
| BTU | Ergs (erg) |
|---|---|
| 1 BTU | 10550558530 erg |
| 100 BTU | 1055055853000 erg |
| 1000 BTU | 10550558530000 erg |
| 3412 BTU | 35998505690000 erg |
| 5000 BTU | 52752792630000 erg |
| 10000 BTU | 105505585300000 erg |
| 12000 BTU | 126606702300000 erg |
| 24000 BTU | 253213404600000 erg |
| 50000 BTU | 527527926300000 erg |
| 100000 BTU | 1.055055853 × 10¹⁵ erg |
| 1000000 BTU | 1.055055853 × 10¹⁶ erg |
Where it's used
BTU are used for furnace, boiler and fuel ratings in the US, while ergs appear in astrophysics (luminosities in erg/s). Both measure energy, work and heat, so the conversion is a fixed factor.
BTU to other energy units
| Conversion | 1 BTU equals |
|---|---|
| BTU to joule | 1055.055853 J |
| BTU to kilojoule | 1.055055853 kJ |
| BTU to megajoule | 0.001055055853 MJ |
| BTU to calorie | 252.1644007 cal |
| BTU to kilocalorie | 0.2521644007 kcal |
| BTU to watt-hour | 0.2930710702 Wh |
| BTU to kilowatt-hour | 0.0002930710702 kWh |
| BTU to therm | 0.00001000238767 thm |
| BTU to electronvolt | 6.585140678 × 10²¹ eV |
| BTU to foot-pound | 778.1692623 ft·lbf |
| BTU to erg | 10550558530 erg |
Frequently asked questions
How many ergs are in 1 British thermal unit?
1 BTU = 10550558530 erg.
How do I convert British thermal units to ergs?
Multiply the value in BTU by 10550558530. For example, 15 BTU × 10550558530 = 158258377900 erg.
Is the BTU to erg 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, "British thermal unit_IT (Btu_IT)".
- 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 BTU to Ergs. Retrieved October 17, 2026, from https://scientificconverters.com/energy/btu-to-ergs/
IEEE
Scientific Converters, "Convert BTU to Ergs," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/btu-to-ergs/