Convert BTU/(h·ft²·°F) to kcal/(h·m²·°C)
1 BTU per hour square foot degree Fahrenheit (BTU/(h·ft²·°F)) = 4.882427636 kilocalories per hour square metre degree Celsius (kcal/(h·m²·°C)). 1 kcal/(h·m²·°C) = 0.2048161436 BTU/(h·ft²·°F). Example: 15 BTU/(h·ft²·°F) = 15 × 4.882427636 = 73.23641455 kcal/(h·m²·°C).
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1 BTU/(h·ft²·°F) = 4.882427636 kcal/(h·m²·°C)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BTU per hour square foot degree Fahrenheit to kilocalorie per hour square metre degree Celsius converter to paste a column from Excel.
How to Convert BTU/(h·ft²·°F) to kcal/(h·m²·°C)
- 1 BTU/(h·ft²·°F) = 4.882427636 kcal/(h·m²·°C)
- 1 kcal/(h·m²·°C) = 0.2048161436 BTU/(h·ft²·°F)
- Example: convert 15 BTU/(h·ft²·°F) to kcal/(h·m²·°C): 15 BTU/(h·ft²·°F) = 15 × 4.882427636 kcal/(h·m²·°C) = 73.23641455 kcal/(h·m²·°C)
Reference conditions. kcal/(h·m²·°C): International Table kilocalorie (4186.8 J), as used in engineering heat transfer data
Formula
kcal/(h·m²·°C) = BTU/(h·ft²·°F) × 4.882427636383
Derivation from SI units:
- 1 BTU_IT/(h·ft²·°F) = 1055.05585262 J ÷ (3600 s × 0.09290304 m² × 5/9 K) = 5.678263341 W/(m²·K) (exact)
- 1 kcal_IT/(h·m²·°C) = 4186.8 J ÷ (3600 s × 1 m² × 1 K) = 1.163 W/(m²·K) (exact)
- 1 BTU/(h·ft²·°F) = 5.678263341113 W/(m²·K) ÷ 1.163 W/(m²·K) per kcal/(h·m²·°C) = 4.882427636383 kcal/(h·m²·°C)
Both units are defined exactly, so the factor is exact. BTU/(h·ft²·°F) definition: BTU per hour square foot degree Fahrenheit; kcal/(h·m²·°C) definition: kilocalorie per hour square metre degree Celsius.
Worked examples
- A reading of 0.5 BTU/(h·ft²·°F) converts to 2.441213818 kcal/(h·m²·°C).
0.5 BTU/(h·ft²·°F) × 4.882427636 = 2.441213818 kcal/(h·m²·°C) - A value of 50 BTU/(h·ft²·°F) is 244.1213818 kcal/(h·m²·°C).
50 BTU/(h·ft²·°F) × 4.882427636 = 244.1213818 kcal/(h·m²·°C)
BTU/(h·ft²·°F) to kcal/(h·m²·°C) conversion table
| BTU/(h·ft²·°F) | kcal/(h·m²·°C) |
|---|---|
| 0.03 BTU/(h·ft²·°F) | 0.1464728291 kcal/(h·m²·°C) |
| 0.05 BTU/(h·ft²·°F) | 0.2441213818 kcal/(h·m²·°C) |
| 0.25 BTU/(h·ft²·°F) | 1.220606909 kcal/(h·m²·°C) |
| 0.5 BTU/(h·ft²·°F) | 2.441213818 kcal/(h·m²·°C) |
| 1 BTU/(h·ft²·°F) | 4.882427636 kcal/(h·m²·°C) |
| 2 BTU/(h·ft²·°F) | 9.764855273 kcal/(h·m²·°C) |
| 5 BTU/(h·ft²·°F) | 24.41213818 kcal/(h·m²·°C) |
| 50 BTU/(h·ft²·°F) | 244.1213818 kcal/(h·m²·°C) |
| 100 BTU/(h·ft²·°F) | 488.2427636 kcal/(h·m²·°C) |
| 250 BTU/(h·ft²·°F) | 1220.606909 kcal/(h·m²·°C) |
| 500 BTU/(h·ft²·°F) | 2441.213818 kcal/(h·m²·°C) |
Where it's used
BTU/(h·ft²·°F) are used for US window and building U-factors (NFRC, ASHRAE), while kilocalories per hour square metre degree Celsius appear in older metric heat exchanger and boiler data. Both measure heat transfer coefficient (h) and thermal transmittance (U-value), so the conversion is a fixed factor.
BTU/(h·ft²·°F) to other heat transfer coefficient units
| Conversion | 1 BTU/(h·ft²·°F) equals |
|---|---|
| BTU per hour square foot degree Fahrenheit to kilocalorie per hour square metre degree Celsius | 4.882427636 kcal/(h·m²·°C) |
| BTU per hour square foot degree Fahrenheit to watt per square metre kelvin | 5.678263341 W/(m²·K) |
| BTU per hour square foot degree Fahrenheit to kilowatt per square metre kelvin | 0.005678263341 kW/(m²·K) |
| BTU per hour square foot degree Fahrenheit to watt per square centimetre kelvin | 0.0005678263341 W/(cm²·K) |
| BTU per hour square foot degree Fahrenheit to calorie per second square centimetre degree Celsius | 0.000135713751 cal/(s·cm²·°C) |
Frequently asked questions
How many kilocalories per hour square metre degree Celsius are in 1 BTU per hour square foot degree Fahrenheit?
1 BTU/(h·ft²·°F) = 4.882427636 kcal/(h·m²·°C).
How do I convert BTU per hour square foot degree Fahrenheit to kilocalories per hour square metre degree Celsius?
Multiply the value in BTU/(h·ft²·°F) by 4.882427636. For example, 15 BTU/(h·ft²·°F) × 4.882427636 = 73.23641455 kcal/(h·m²·°C).
Is the BTU/(h·ft²·°F) to kcal/(h·m²·°C) 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
- 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 hour square foot degree Fahrenheit [Btu_IT/(h · ft² · °F)]".
- 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, "kilocalorie_IT".
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/(h·ft²·°F) to kcal/(h·m²·°C). Retrieved October 25, 2026, from https://scientificconverters.com/heat-transfer-coefficient/btu-per-hour-square-foot-fahrenheit-to-kilocalories-per-hour-square-meter-celsius/
IEEE
Scientific Converters, "Convert BTU/(h·ft²·°F) to kcal/(h·m²·°C)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/heat-transfer-coefficient/btu-per-hour-square-foot-fahrenheit-to-kilocalories-per-hour-square-meter-celsius/