BTU per Pound °F (BTU/(lb·°F))
BTU per pound degree Fahrenheit is the US specific heat unit. By the definitions of the BTU and the International Table calorie, 1 BTU/(lb·°F) = 1 kcal/(kg·°C) = 4.1868 kJ/(kg·K): water is 1, air 0.24, steel 0.12.
Symbol: BTU/(lb·°F) (ASCII: BTU/(lb F))
Quantity: specific heat capacity
SI relation: 1 BTU/(lb·°F) = 4186.8 J/(kg·K) (exact)
Derivation: 1 BTU_IT/(lb·°F) = 4186.8 J/(kg·K) exactly (the BTU and the calorie scale the same way).
Exact: yes, by definition
Same quantity as calorie per gram degree Celsius (cal/(g·°C)) , kilocalorie per kilogram degree Celsius (kcal/(kg·°C)) : the factor between them is exactly 1.
Typical uses
- US HVAC and process design
- ASHRAE and Perry’s data in US units
Convert BTU per pound degree Fahrenheit to other units
| Conversion | 1 BTU/(lb·°F) equals | Reverse |
|---|---|---|
| BTU per pound degree Fahrenheit to joule per kilogram kelvin | 4186.8 J/(kg·K) | joule per kilogram kelvin to BTU per pound degree Fahrenheit |
| BTU per pound degree Fahrenheit to kilojoule per kilogram kelvin | 4.1868 kJ/(kg·K) | kilojoule per kilogram kelvin to BTU per pound degree Fahrenheit |
| BTU per pound degree Fahrenheit to calorie per gram degree Celsius | 1 cal/(g·°C) | calorie per gram degree Celsius to BTU per pound degree Fahrenheit |
| BTU per pound degree Fahrenheit to joule per gram kelvin | 4.1868 J/(g·K) | joule per gram kelvin to BTU per pound degree Fahrenheit |
| BTU per pound degree Fahrenheit to kilocalorie per kilogram degree Celsius | 1 kcal/(kg·°C) | kilocalorie per kilogram degree Celsius to BTU per pound degree Fahrenheit |
Open the Specific Heat Converter (kJ/kg·K, BTU/lb·°F) to convert any value between all units.
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 per pound degree Fahrenheit".
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). BTU per Pound °F (BTU/(lb·°F)). Retrieved October 29, 2026, from https://scientificconverters.com/units/btu-per-pound-fahrenheit/
IEEE
Scientific Converters, "BTU per Pound °F (BTU/(lb·°F))," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/units/btu-per-pound-fahrenheit/