Convert BTU per Pound °F to Joules per Gram Kelvin
1 BTU per pound degree Fahrenheit (BTU/(lb·°F)) = 4.1868 joules per gram kelvin (J/(g·K)). 1 J/(g·K) = 0.2388458966 BTU/(lb·°F). Example: 15 BTU/(lb·°F) = 15 × 4.1868 = 62.802 J/(g·K).
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1 BTU/(lb·°F) = 4.1868 J/(g·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 gram kelvin converter to paste a column from Excel.
How to Convert BTU per Pound °F to Joule per Gram Kelvin
- 1 BTU/(lb·°F) = 4.1868 J/(g·K)
- 1 J/(g·K) = 0.2388458966 BTU/(lb·°F)
- Example: convert 15 BTU/(lb·°F) to J/(g·K): 15 BTU/(lb·°F) = 15 × 4.1868 J/(g·K) = 62.802 J/(g·K)
Formula
J/(g·K) = BTU/(lb·°F) × 4.1868
Derivation from SI units:
- 1 BTU_IT/(lb·°F) = 4186.8 J/(kg·K) exactly (the BTU and the calorie scale the same way).
- 1 J/(g·K) = 1000 J/(kg·K) = 1 kJ/(kg·K).
- 1 BTU/(lb·°F) = 4186.8 J/(kg·K) ÷ 1000 J/(kg·K) per J/(g·K) = 4.1868 J/(g·K)
Both units are defined exactly, so the factor is exact. BTU per Pound °F definition: BTU per pound degree Fahrenheit; Joule per Gram Kelvin definition: joule per gram kelvin.
Worked examples
- A reading of 0.12 BTU/(lb·°F) converts to 0.502416 J/(g·K).
0.12 BTU/(lb·°F) × 4.1868 = 0.502416 J/(g·K) - A value of 0.45 BTU/(lb·°F) is 1.88406 J/(g·K).
0.45 BTU/(lb·°F) × 4.1868 = 1.88406 J/(g·K)
BTU per Pound °F to Joule per Gram Kelvin conversion table
| BTU per Pound °F (BTU/(lb·°F)) | Joules per Gram Kelvin (J/(g·K)) |
|---|---|
| 0.03 BTU/(lb·°F) | 0.125604 J/(g·K) |
| 0.09 BTU/(lb·°F) | 0.376812 J/(g·K) |
| 0.11 BTU/(lb·°F) | 0.460548 J/(g·K) |
| 0.12 BTU/(lb·°F) | 0.502416 J/(g·K) |
| 0.2 BTU/(lb·°F) | 0.83736 J/(g·K) |
| 0.24 BTU/(lb·°F) | 1.004832 J/(g·K) |
| 0.45 BTU/(lb·°F) | 1.88406 J/(g·K) |
| 0.5 BTU/(lb·°F) | 2.0934 J/(g·K) |
| 0.8 BTU/(lb·°F) | 3.34944 J/(g·K) |
| 1 BTU/(lb·°F) | 4.1868 J/(g·K) |
Where it's used
BTU per Pound °F are used for US HVAC and process design, while joules per gram kelvin appear in calorimetry in chemistry. 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 gram kelvin | 4.1868 J/(g·K) |
| 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 kilocalorie per kilogram degree Celsius | 1 kcal/(kg·°C) |
Frequently asked questions
How many joules per gram kelvin are in 1 BTU per pound degree Fahrenheit?
1 BTU/(lb·°F) = 4.1868 J/(g·K).
How do I convert BTU per pound degree Fahrenheit to joules per gram kelvin?
Multiply the value in BTU/(lb·°F) by 4.1868. For example, 15 BTU/(lb·°F) × 4.1868 = 62.802 J/(g·K).
Is the BTU/(lb·°F) to J/(g·K) conversion exact?
Yes. Both units are defined exactly, and 1 BTU/(lb·°F) is exactly 4.1868 J/(g·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 Gram Kelvin. Retrieved October 29, 2026, from https://scientificconverters.com/specific-heat/btu-per-pound-fahrenheit-to-joules-per-gram-kelvin/
IEEE
Scientific Converters, "Convert BTU per Pound °F to Joules per Gram Kelvin," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-heat/btu-per-pound-fahrenheit-to-joules-per-gram-kelvin/