Joules per Kilogram to BTU per Pound (J/kg to BTU/lb)
1 joule per kilogram (J/kg) = 0.0004299226139 BTU per pound (BTU/lb). 1 BTU/lb = 2326 J/kg. Example: 15 J/kg = 15 × 0.0004299226139 = 0.006448839209 BTU/lb.
Also searched as joules per kilogram to BTU/lb, joules per kilogram in BTU/lb, joules per kilogram into BTU per pound, J/kg to BTU/lb, J/kg in BTU per pound, J/kg into BTU per pound, joule per kilogram to BTU per pound, J/kg to BTU per pound converter and how many BTU per pound in a joule per kilogram.
1 J/kg = 0.0004299226139 BTU/lb
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk joule per kilogram to BTU per pound converter to paste a column from Excel.
How to Convert Joule per Kilogram to BTU per Pound
- 1 J/kg = 0.0004299226139 BTU/lb
- 1 BTU/lb = 2326 J/kg
- Example: convert 15 J/kg to BTU/lb: 15 J/kg = 15 × 0.0004299226139 BTU/lb = 0.006448839209 BTU/lb
Formula
BTU/lb = J/kg ÷ 2326
Derivation from SI units:
- Energy per unit mass: J/kg (also m²/s²).
- 1 BTU_IT/lb = 1055.05585262 J ÷ 0.45359237 kg = 2326 J/kg exactly.
Both units are defined exactly, so the factor is exact. Joule per Kilogram definition: joule per kilogram; BTU per Pound definition: BTU per pound.
Worked examples
- A reading of 334000 J/kg converts to 143.5941531 BTU/lb.
334000 J/kg × 0.0004299226139 = 143.5941531 BTU/lb - A value of 2500000 J/kg is 1074.806535 BTU/lb.
2500000 J/kg × 0.0004299226139 = 1074.806535 BTU/lb
Joule per Kilogram to BTU per Pound conversion table
| Joules per Kilogram (J/kg) | BTU per Pound (BTU/lb) |
|---|---|
| 1000 J/kg | 0.4299226139 BTU/lb |
| 10000 J/kg | 4.299226139 BTU/lb |
| 100000 J/kg | 42.99226139 BTU/lb |
| 334000 J/kg | 143.5941531 BTU/lb |
| 1000000 J/kg | 429.9226139 BTU/lb |
| 2257000 J/kg | 970.3353396 BTU/lb |
| 2500000 J/kg | 1074.806535 BTU/lb |
| 10000000 J/kg | 4299.226139 BTU/lb |
| 42000000 J/kg | 18056.74979 BTU/lb |
| 50000000 J/kg | 21496.1307 BTU/lb |
Where it's used
Joules per Kilogram are used for specific enthalpy h and internal energy u, 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 Kilogram to other specific energy units
| Conversion | 1 J/kg equals |
|---|---|
| joule per kilogram to BTU per pound | 0.0004299226139 BTU/lb |
| joule per kilogram to kilojoule per kilogram | 0.001 kJ/kg |
| joule per kilogram to megajoule per kilogram | 0.000001 MJ/kg |
| joule per kilogram to kilocalorie per kilogram | 0.0002388458966 kcal/kg |
| joule per kilogram to calorie per gram | 0.0002388458966 cal/g |
| joule per kilogram to kilowatt-hour per kilogram | 2.777777778 × 10⁻⁷ kWh/kg |
| joule per kilogram to joule per gram | 0.001 J/g |
Frequently asked questions
How many BTU per pound are in 1 joule per kilogram?
1 J/kg = 0.0004299226139 BTU/lb.
How do I convert joules per kilogram to BTU per pound?
Multiply the value in J/kg by 0.0004299226139, or divide it by 2326. For example, 15 J/kg × 0.0004299226139 = 0.006448839209 BTU/lb.
Is the J/kg 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). Joules per Kilogram to BTU per Pound (J/kg to BTU/lb). Retrieved October 29, 2026, from https://scientificconverters.com/specific-energy/joules-per-kilogram-to-btu-per-pound/
IEEE
Scientific Converters, "Joules per Kilogram to BTU per Pound (J/kg to BTU/lb)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-energy/joules-per-kilogram-to-btu-per-pound/