Convert Joules per Kilogram Kelvin to BTU per Pound °F
1 joule per kilogram kelvin (J/(kg·K)) = 0.0002388458966 BTU per pound degree Fahrenheit (BTU/(lb·°F)). 1 BTU/(lb·°F) = 4186.8 J/(kg·K). Example: 15 J/(kg·K) = 15 × 0.0002388458966 = 0.003582688449 BTU/(lb·°F).
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1 J/(kg·K) = 0.0002388458966 BTU/(lb·°F)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk joule per kilogram kelvin to BTU per pound degree Fahrenheit converter to paste a column from Excel.
How to Convert Joule per Kilogram Kelvin to BTU per Pound °F
- 1 J/(kg·K) = 0.0002388458966 BTU/(lb·°F)
- 1 BTU/(lb·°F) = 4186.8 J/(kg·K)
- Example: convert 15 J/(kg·K) to BTU/(lb·°F): 15 J/(kg·K) = 15 × 0.0002388458966 BTU/(lb·°F) = 0.003582688449 BTU/(lb·°F)
Formula
BTU/(lb·°F) = J/(kg·K) × 0.0002388458966275
or BTU/(lb·°F) = J/(kg·K) ÷ 4186.8
Derivation from SI units:
- Heat per unit mass per kelvin: J/(kg·K) (a kelvin step equals a degree Celsius step).
- 1 BTU_IT/(lb·°F) = 4186.8 J/(kg·K) exactly (the BTU and the calorie scale the same way).
Both units are defined exactly, so the factor is exact. Joule per Kilogram Kelvin definition: joule per kilogram kelvin; BTU per Pound °F definition: BTU per pound degree Fahrenheit.
Worked examples
- A reading of 500 J/(kg·K) converts to 0.1194229483 BTU/(lb·°F).
500 J/(kg·K) × 0.0002388458966 = 0.1194229483 BTU/(lb·°F) - A value of 1005 J/(kg·K) is 0.2400401261 BTU/(lb·°F).
1005 J/(kg·K) × 0.0002388458966 = 0.2400401261 BTU/(lb·°F)
Joule per Kilogram Kelvin to BTU per Pound °F conversion table
| Joules per Kilogram Kelvin (J/(kg·K)) | BTU per Pound °F (BTU/(lb·°F)) |
|---|---|
| 129 J/(kg·K) | 0.03081112066 BTU/(lb·°F) |
| 385 J/(kg·K) | 0.0919556702 BTU/(lb·°F) |
| 450 J/(kg·K) | 0.1074806535 BTU/(lb·°F) |
| 500 J/(kg·K) | 0.1194229483 BTU/(lb·°F) |
| 840 J/(kg·K) | 0.2006305532 BTU/(lb·°F) |
| 900 J/(kg·K) | 0.214961307 BTU/(lb·°F) |
| 1005 J/(kg·K) | 0.2400401261 BTU/(lb·°F) |
| 2000 J/(kg·K) | 0.4776917933 BTU/(lb·°F) |
| 4180 J/(kg·K) | 0.9983758479 BTU/(lb·°F) |
| 14300 J/(kg·K) | 3.415496322 BTU/(lb·°F) |
Where it's used
Joules per Kilogram Kelvin are used for sensible heat Q = m c ΔT, while BTU per pound degree Fahrenheit appear in US HVAC and process design. Both measure specific heat capacity, so the conversion is a fixed factor.
Joule per Kilogram Kelvin to other specific heat capacity units
| Conversion | 1 J/(kg·K) equals |
|---|---|
| joule per kilogram kelvin to BTU per pound degree Fahrenheit | 0.0002388458966 BTU/(lb·°F) |
| joule per kilogram kelvin to kilojoule per kilogram kelvin | 0.001 kJ/(kg·K) |
| joule per kilogram kelvin to calorie per gram degree Celsius | 0.0002388458966 cal/(g·°C) |
| joule per kilogram kelvin to joule per gram kelvin | 0.001 J/(g·K) |
| joule per kilogram kelvin to kilocalorie per kilogram degree Celsius | 0.0002388458966 kcal/(kg·°C) |
Frequently asked questions
How many BTU per pound degree Fahrenheit are in 1 joule per kilogram kelvin?
1 J/(kg·K) = 0.0002388458966 BTU/(lb·°F).
How do I convert joules per kilogram kelvin to BTU per pound degree Fahrenheit?
Multiply the value in J/(kg·K) by 0.0002388458966, or divide it by 4186.8. For example, 15 J/(kg·K) × 0.0002388458966 = 0.003582688449 BTU/(lb·°F).
Is the J/(kg·K) to BTU/(lb·°F) 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 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). Convert Joules per Kilogram Kelvin to BTU per Pound °F. Retrieved October 29, 2026, from https://scientificconverters.com/specific-heat/joules-per-kilogram-kelvin-to-btu-per-pound-fahrenheit/
IEEE
Scientific Converters, "Convert Joules per Kilogram Kelvin to BTU per Pound °F," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-heat/joules-per-kilogram-kelvin-to-btu-per-pound-fahrenheit/