Kilojoules per Kilogram to BTU per Pound (kJ/kg to BTU/lb)
1 kilojoule per kilogram (kJ/kg) = 0.4299226139 BTU per pound (BTU/lb). 1 BTU/lb = 2.326 kJ/kg. Example: 2257 kJ/kg = 2257 × 0.4299226139 = 970.3353396 BTU/lb.
Also searched as kJ/kg to BTU/lb, kilojoule per kg to btu per pound.
1 kJ/kg = 0.4299226139 BTU/lb
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilojoule per kilogram to BTU per pound converter to paste a column from Excel.
How to Convert Kilojoule per Kilogram to BTU per Pound
- 1 kJ/kg = 0.4299226139 BTU/lb
- 1 BTU/lb = 2.326 kJ/kg
- Example: convert 2257 kJ/kg to BTU/lb: 2257 kJ/kg = 2257 × 0.4299226139 BTU/lb = 970.3353396 BTU/lb
Formula
BTU/lb = kJ/kg × 0.4299226139295
or BTU/lb = kJ/kg ÷ 2.326
Derivation from SI units:
- 1 kJ/kg = 1000 J/kg.
- 1 BTU_IT/lb = 1055.05585262 J ÷ 0.45359237 kg = 2326 J/kg exactly.
- 1 kJ/kg = 1000 J/kg ÷ 2326 J/kg per BTU/lb = 0.4299226139295 BTU/lb
Both units are defined exactly, so the factor is exact. Kilojoule per Kilogram definition: kilojoule per kilogram; BTU per Pound definition: BTU per pound.
Worked examples
- Water’s latent heat of 2257 kJ/kg is 970.3353396 BTU/lb.
2257 kJ/kg × 0.4299226139 = 970.3353396 BTU/lb - The latent heat of fusion, 334 kJ/kg, is 143.5941531 BTU/lb.
334 kJ/kg × 0.4299226139 = 143.5941531 BTU/lb
Kilojoule per Kilogram to BTU per Pound conversion table
| Kilojoules per Kilogram (kJ/kg) | BTU per Pound (BTU/lb) |
|---|---|
| 1 kJ/kg | 0.4299226139 BTU/lb |
| 10 kJ/kg | 4.299226139 BTU/lb |
| 100 kJ/kg | 42.99226139 BTU/lb |
| 334 kJ/kg | 143.5941531 BTU/lb |
| 419 kJ/kg | 180.1375752 BTU/lb |
| 1000 kJ/kg | 429.9226139 BTU/lb |
| 2257 kJ/kg | 970.3353396 BTU/lb |
| 2676 kJ/kg | 1150.472915 BTU/lb |
| 3000 kJ/kg | 1289.767842 BTU/lb |
| 3500 kJ/kg | 1504.729149 BTU/lb |
Where it's used
Steam-table enthalpies in kJ/kg are converted to BTU/lb for US-unit calculations. Divide by 2.326.
Kilojoule per Kilogram to other specific energy units
| Conversion | 1 kJ/kg equals |
|---|---|
| kilojoule per kilogram to BTU per pound | 0.4299226139 BTU/lb |
| kilojoule per kilogram to megajoule per kilogram | 0.001 MJ/kg |
| kilojoule per kilogram to kilocalorie per kilogram | 0.2388458966 kcal/kg |
| kilojoule per kilogram to joule per kilogram | 1000 J/kg |
| kilojoule per kilogram to calorie per gram | 0.2388458966 cal/g |
| kilojoule per kilogram to kilowatt-hour per kilogram | 0.0002777777778 kWh/kg |
| kilojoule per kilogram to joule per gram | 1 J/g |
Frequently asked questions
How many BTU/lb is 1 kJ/kg?
1 kJ/kg = 0.4299226139 BTU/lb.
How many BTU per pound are in 1 kilojoule per kilogram?
1 kJ/kg = 0.4299226139 BTU/lb.
How do I convert kilojoules per kilogram to BTU per pound?
Multiply the value in kJ/kg by 0.4299226139, or divide it by 2.326. For example, 2257 kJ/kg × 0.4299226139 = 970.3353396 BTU/lb.
Is the kJ/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). Kilojoules per Kilogram to BTU per Pound (kJ/kg to BTU/lb). Retrieved October 29, 2026, from https://scientificconverters.com/specific-energy/kilojoules-per-kilogram-to-btu-per-pound/
IEEE
Scientific Converters, "Kilojoules per Kilogram to BTU per Pound (kJ/kg to BTU/lb)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-energy/kilojoules-per-kilogram-to-btu-per-pound/