Convert Joules per Gram to BTU per Pound (J/g to BTU/lb)
1 joule per gram (J/g) = 0.4299226139 BTU per pound (BTU/lb). 1 BTU/lb = 2.326 J/g. Example: 15 J/g = 15 × 0.4299226139 = 6.448839209 BTU/lb.
Also searched as joules per gram to BTU/lb, joules per gram in BTU/lb, joules per gram into BTU per pound, J/g to BTU/lb, J/g in BTU per pound, J/g into BTU per pound, joule per gram to BTU per pound, J/g to BTU per pound converter and how many BTU per pound in a joule per gram.
1 J/g = 0.4299226139 BTU/lb
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk joule per gram to BTU per pound converter to paste a column from Excel.
How to Convert Joule per Gram to BTU per Pound
- 1 J/g = 0.4299226139 BTU/lb
- 1 BTU/lb = 2.326 J/g
- Example: convert 15 J/g to BTU/lb: 15 J/g = 15 × 0.4299226139 BTU/lb = 6.448839209 BTU/lb
Formula
BTU/lb = J/g × 0.4299226139295
or BTU/lb = J/g ÷ 2.326
Derivation from SI units:
- 1 J/g = 1 kJ/kg.
- 1 BTU_IT/lb = 1055.05585262 J ÷ 0.45359237 kg = 2326 J/kg exactly.
- 1 J/g = 1000 J/kg ÷ 2326 J/kg per BTU/lb = 0.4299226139295 BTU/lb
Both units are defined exactly, so the factor is exact. Joule per Gram definition: joule per gram; BTU per Pound definition: BTU per pound.
Worked examples
- A reading of 100 J/g converts to 42.99226139 BTU/lb.
100 J/g × 0.4299226139 = 42.99226139 BTU/lb - A value of 1000 J/g is 429.9226139 BTU/lb.
1000 J/g × 0.4299226139 = 429.9226139 BTU/lb
Joule per Gram to BTU per Pound conversion table
| Joules per Gram (J/g) | BTU per Pound (BTU/lb) |
|---|---|
| 1 J/g | 0.4299226139 BTU/lb |
| 10 J/g | 4.299226139 BTU/lb |
| 50 J/g | 21.4961307 BTU/lb |
| 100 J/g | 42.99226139 BTU/lb |
| 200 J/g | 85.98452279 BTU/lb |
| 334 J/g | 143.5941531 BTU/lb |
| 1000 J/g | 429.9226139 BTU/lb |
| 2257 J/g | 970.3353396 BTU/lb |
| 17000 J/g | 7308.684437 BTU/lb |
| 37000 J/g | 15907.13672 BTU/lb |
Where it's used
Joules per Gram are used for DSC melting and crystallisation enthalpy, while BTU per pound appear in US steam tables. Both measure specific energy: enthalpy, latent heat and heating value per mass, so the conversion is a fixed factor.
Joule per Gram to other specific energy units
| Conversion | 1 J/g equals |
|---|---|
| joule per gram to BTU per pound | 0.4299226139 BTU/lb |
| joule per gram to kilojoule per kilogram | 1 kJ/kg |
| joule per gram to megajoule per kilogram | 0.001 MJ/kg |
| joule per gram to kilocalorie per kilogram | 0.2388458966 kcal/kg |
| joule per gram to joule per kilogram | 1000 J/kg |
| joule per gram to calorie per gram | 0.2388458966 cal/g |
| joule per gram to kilowatt-hour per kilogram | 0.0002777777778 kWh/kg |
Frequently asked questions
How many BTU per pound are in 1 joule per gram?
1 J/g = 0.4299226139 BTU/lb.
How do I convert joules per gram to BTU per pound?
Multiply the value in J/g by 0.4299226139, or divide it by 2.326. For example, 15 J/g × 0.4299226139 = 6.448839209 BTU/lb.
Is the J/g to BTU/lb 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
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (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, "British thermal unit_IT per pound".
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 per Gram to BTU per Pound (J/g to BTU/lb). Retrieved October 29, 2026, from https://scientificconverters.com/specific-energy/joules-per-gram-to-btu-per-pound/
IEEE
Scientific Converters, "Convert Joules per Gram to BTU per Pound (J/g to BTU/lb)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-energy/joules-per-gram-to-btu-per-pound/