Convert BTU per Pound °F to Joules per Kilogram Kelvin
1 BTU per pound degree Fahrenheit (BTU/(lb·°F)) = 4186.8 joules per kilogram kelvin (J/(kg·K)). 1 J/(kg·K) = 0.0002388458966 BTU/(lb·°F). Example: 15 BTU/(lb·°F) = 15 × 4186.8 = 62802 J/(kg·K).
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1 BTU/(lb·°F) = 4186.8 J/(kg·K)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BTU per pound degree Fahrenheit to joule per kilogram kelvin converter to paste a column from Excel.
How to Convert BTU per Pound °F to Joule per Kilogram Kelvin
- 1 BTU/(lb·°F) = 4186.8 J/(kg·K)
- 1 J/(kg·K) = 0.0002388458966 BTU/(lb·°F)
- Example: convert 15 BTU/(lb·°F) to J/(kg·K): 15 BTU/(lb·°F) = 15 × 4186.8 J/(kg·K) = 62802 J/(kg·K)
Formula
J/(kg·K) = BTU/(lb·°F) × 4186.8
Derivation from SI units:
- 1 BTU_IT/(lb·°F) = 4186.8 J/(kg·K) exactly (the BTU and the calorie scale the same way).
- Heat per unit mass per kelvin: J/(kg·K) (a kelvin step equals a degree Celsius step).
Both units are defined exactly, so the factor is exact. BTU per Pound °F definition: BTU per pound degree Fahrenheit; Joule per Kilogram Kelvin definition: joule per kilogram kelvin.
Worked examples
- A reading of 0.12 BTU/(lb·°F) converts to 502.416 J/(kg·K).
0.12 BTU/(lb·°F) × 4186.8 = 502.416 J/(kg·K) - A value of 0.45 BTU/(lb·°F) is 1884.06 J/(kg·K).
0.45 BTU/(lb·°F) × 4186.8 = 1884.06 J/(kg·K)
BTU per Pound °F to Joule per Kilogram Kelvin conversion table
| BTU per Pound °F (BTU/(lb·°F)) | Joules per Kilogram Kelvin (J/(kg·K)) |
|---|---|
| 0.03 BTU/(lb·°F) | 125.604 J/(kg·K) |
| 0.09 BTU/(lb·°F) | 376.812 J/(kg·K) |
| 0.11 BTU/(lb·°F) | 460.548 J/(kg·K) |
| 0.12 BTU/(lb·°F) | 502.416 J/(kg·K) |
| 0.2 BTU/(lb·°F) | 837.36 J/(kg·K) |
| 0.24 BTU/(lb·°F) | 1004.832 J/(kg·K) |
| 0.45 BTU/(lb·°F) | 1884.06 J/(kg·K) |
| 0.5 BTU/(lb·°F) | 2093.4 J/(kg·K) |
| 0.8 BTU/(lb·°F) | 3349.44 J/(kg·K) |
| 1 BTU/(lb·°F) | 4186.8 J/(kg·K) |
Where it's used
BTU per Pound °F are used for US HVAC and process design, while joules per kilogram kelvin appear in sensible heat Q = m c ΔT. Both measure specific heat capacity, so the conversion is a fixed factor.
BTU per Pound °F to other specific heat capacity units
| Conversion | 1 BTU/(lb·°F) equals |
|---|---|
| BTU per pound degree Fahrenheit to joule per kilogram kelvin | 4186.8 J/(kg·K) |
| BTU per pound degree Fahrenheit to kilojoule per kilogram kelvin | 4.1868 kJ/(kg·K) |
| BTU per pound degree Fahrenheit to calorie per gram degree Celsius | 1 cal/(g·°C) |
| BTU per pound degree Fahrenheit to joule per gram kelvin | 4.1868 J/(g·K) |
| BTU per pound degree Fahrenheit to kilocalorie per kilogram degree Celsius | 1 kcal/(kg·°C) |
Frequently asked questions
How many joules per kilogram kelvin are in 1 BTU per pound degree Fahrenheit?
1 BTU/(lb·°F) = 4186.8 J/(kg·K).
How do I convert BTU per pound degree Fahrenheit to joules per kilogram kelvin?
Multiply the value in BTU/(lb·°F) by 4186.8. For example, 15 BTU/(lb·°F) × 4186.8 = 62802 J/(kg·K).
Is the BTU/(lb·°F) to J/(kg·K) conversion exact?
Yes. Both units are defined exactly, and 1 BTU/(lb·°F) is exactly 4186.8 J/(kg·K).
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".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units with special names).
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 BTU per Pound °F to Joules per Kilogram Kelvin. Retrieved October 29, 2026, from https://scientificconverters.com/specific-heat/btu-per-pound-fahrenheit-to-joules-per-kilogram-kelvin/
IEEE
Scientific Converters, "Convert BTU per Pound °F to Joules per Kilogram Kelvin," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-heat/btu-per-pound-fahrenheit-to-joules-per-kilogram-kelvin/