Convert Ergs to Therms
1 erg equals 9.48043428 × 10⁻¹⁶ therms (thm).
1 erg = 9.48043428e-16 thm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk erg to therm converter to paste a column from Excel.
How to Convert Erg to Therm
- 1 erg = 9.48043428 × 10⁻¹⁶ thm
- 1 thm = 1.054804 × 10¹⁵ erg
- Example: convert 15 erg to thm: 15 erg = 15 × 9.48043428 × 10⁻¹⁶ thm = 1.422065142 × 10⁻¹⁴ thm
Reference conditions. thm: US therm, 100 000 BTU (59 °F), 105.4804 MJ as given by NIST SP 811. The EC therm is 105.506 MJ.
Formula
thm = erg ÷ 1.054804 × 10¹⁵
Derivation from SI units:
- 1 erg = 1 dyn·cm = 10⁻⁷ J
- 1 thm (US) = 1.054804 × 10⁸ J (NIST SP 811)
- 1 erg = 1 × 10⁻⁷ J ÷ 105480400 J per thm = 9.480434279733 × 10⁻¹⁶ thm
Both units are defined exactly, so the factor is exact. Erg definition: erg; Therm definition: therm.
Worked examples
- A reading of 1000 erg converts to 9.48043428 × 10⁻¹³ thm.
1000 erg × 9.48043428 × 10⁻¹⁶ = 9.48043428 × 10⁻¹³ thm - A value of 1e6 erg is 9.48043428 × 10⁻¹⁰ thm.
1e6 erg × 9.48043428 × 10⁻¹⁶ = 9.48043428 × 10⁻¹⁰ thm
Erg to Therm conversion table
| Ergs (erg) | Therms (thm) |
|---|---|
| 1 erg | 9.48043428 × 10⁻¹⁶ thm |
| 10 erg | 9.48043428 × 10⁻¹⁵ thm |
| 100 erg | 9.48043428 × 10⁻¹⁴ thm |
| 1000 erg | 9.48043428 × 10⁻¹³ thm |
| 10000 erg | 9.48043428 × 10⁻¹² thm |
| 1e5 erg | 9.48043428 × 10⁻¹¹ thm |
| 1e6 erg | 9.48043428 × 10⁻¹⁰ thm |
| 1e7 erg | 9.48043428 × 10⁻⁹ thm |
| 1e10 erg | 0.00000948043428 thm |
| 3.828e33 erg | 3.629110242 × 10¹⁸ thm |
Where it's used
Ergs are used for astrophysics (luminosities in erg/s), while therms appear in US and UK natural-gas bills. 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 therms are in 1 erg?
1 erg = 9.48043428 × 10⁻¹⁶ thm.
How do I convert ergs to therms?
Multiply the value in erg by 9.48043428 × 10⁻¹⁶, or divide it by 1.054804 × 10¹⁵. For example, 15 erg × 9.48043428 × 10⁻¹⁶ = 1.422065142 × 10⁻¹⁴ thm.
Is the erg to thm 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, "therm (U.S.)".
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 Therms. Retrieved October 17, 2026, from https://scientificconverters.com/energy/ergs-to-therms/
IEEE
Scientific Converters, "Convert Ergs to Therms," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/ergs-to-therms/