Convert BTU/(h·ft²·°F) to cal/(s·cm²·°C)
1 BTU per hour square foot degree Fahrenheit (BTU/(h·ft²·°F)) = 0.000135713751 calories per second square centimetre degree Celsius (cal/(s·cm²·°C)). 1 cal/(s·cm²·°C) = 7368.450085 BTU/(h·ft²·°F). Example: 15 BTU/(h·ft²·°F) = 15 × 0.000135713751 = 0.002035706265 cal/(s·cm²·°C).
Also searched as BTU per hour square foot degree Fahrenheit to calorie per second square centimetre degree Celsius, BTU per hour square foot degree Fahrenheit in calorie per second square centimetre degree Celsius, BTU per hour square foot degree Fahrenheit into calories per second square centimetre degree Celsius, BTU per hour square foot degree Fahrenheit in calories per second square centimetre degree Celsius, BTU per hour square foot degree Fahrenheit into calorie per second square centimetre degree Celsius, BTU per hour square foot degree Fahrenheit to calories per second square centimetre degree Celsius converter, BTU per hour square foot degree Fahrenheit to calories per second square centimeter degree Celsius and how many calories per second square centimetre degree Celsius in a BTU per hour square foot degree Fahrenheit.
1 BTU/(h·ft²·°F) = 0.000135713751 cal/(s·cm²·°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 calorie per second square centimetre degree Celsius converter to paste a column from Excel.
How to Convert BTU/(h·ft²·°F) to cal/(s·cm²·°C)
- 1 BTU/(h·ft²·°F) = 0.000135713751 cal/(s·cm²·°C)
- 1 cal/(s·cm²·°C) = 7368.450085 BTU/(h·ft²·°F)
- Example: convert 15 BTU/(h·ft²·°F) to cal/(s·cm²·°C): 15 BTU/(h·ft²·°F) = 15 × 0.000135713751 cal/(s·cm²·°C) = 0.002035706265 cal/(s·cm²·°C)
Reference conditions. cal/(s·cm²·°C): Thermochemical calorie (4.184 J)
Formula
cal/(s·cm²·°C) = BTU/(h·ft²·°F) × 0.0001357137509826
or cal/(s·cm²·°C) = BTU/(h·ft²·°F) ÷ 7368.450085268
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 cal_th/(s·cm²·°C) = 4.184 J ÷ (1 s × 10⁻⁴ m² × 1 K) = 41 840 W/(m²·K) (exact)
- 1 BTU/(h·ft²·°F) = 5.678263341113 W/(m²·K) ÷ 41840 W/(m²·K) per cal/(s·cm²·°C) = 0.0001357137509826 cal/(s·cm²·°C)
Both units are defined exactly, so the factor is exact. BTU/(h·ft²·°F) definition: BTU per hour square foot degree Fahrenheit; cal/(s·cm²·°C) definition: calorie per second square centimetre degree Celsius.
Worked examples
- A reading of 0.5 BTU/(h·ft²·°F) converts to 0.00006785687549 cal/(s·cm²·°C).
0.5 BTU/(h·ft²·°F) × 0.000135713751 = 0.00006785687549 cal/(s·cm²·°C) - A value of 50 BTU/(h·ft²·°F) is 0.006785687549 cal/(s·cm²·°C).
50 BTU/(h·ft²·°F) × 0.000135713751 = 0.006785687549 cal/(s·cm²·°C)
BTU/(h·ft²·°F) to cal/(s·cm²·°C) conversion table
| BTU/(h·ft²·°F) | cal/(s·cm²·°C) |
|---|---|
| 0.03 BTU/(h·ft²·°F) | 0.000004071412529 cal/(s·cm²·°C) |
| 0.05 BTU/(h·ft²·°F) | 0.000006785687549 cal/(s·cm²·°C) |
| 0.25 BTU/(h·ft²·°F) | 0.00003392843775 cal/(s·cm²·°C) |
| 0.5 BTU/(h·ft²·°F) | 0.00006785687549 cal/(s·cm²·°C) |
| 1 BTU/(h·ft²·°F) | 0.000135713751 cal/(s·cm²·°C) |
| 2 BTU/(h·ft²·°F) | 0.000271427502 cal/(s·cm²·°C) |
| 5 BTU/(h·ft²·°F) | 0.0006785687549 cal/(s·cm²·°C) |
| 50 BTU/(h·ft²·°F) | 0.006785687549 cal/(s·cm²·°C) |
| 100 BTU/(h·ft²·°F) | 0.0135713751 cal/(s·cm²·°C) |
| 250 BTU/(h·ft²·°F) | 0.03392843775 cal/(s·cm²·°C) |
| 500 BTU/(h·ft²·°F) | 0.06785687549 cal/(s·cm²·°C) |
Where it's used
BTU/(h·ft²·°F) are used for US window and building U-factors (NFRC, ASHRAE), while calories per second square centimetre degree Celsius appear in older scientific and metallurgical literature. 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 calorie per second square centimetre degree Celsius | 0.000135713751 cal/(s·cm²·°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 kilocalorie per hour square metre degree Celsius | 4.882427636 kcal/(h·m²·°C) |
| BTU per hour square foot degree Fahrenheit to watt per square centimetre kelvin | 0.0005678263341 W/(cm²·K) |
Frequently asked questions
How many calories per second square centimetre degree Celsius are in 1 BTU per hour square foot degree Fahrenheit?
1 BTU/(h·ft²·°F) = 0.000135713751 cal/(s·cm²·°C).
How do I convert BTU per hour square foot degree Fahrenheit to calories per second square centimetre degree Celsius?
Multiply the value in BTU/(h·ft²·°F) by 0.000135713751, or divide it by 7368.450085. For example, 15 BTU/(h·ft²·°F) × 0.000135713751 = 0.002035706265 cal/(s·cm²·°C).
Is the BTU/(h·ft²·°F) to cal/(s·cm²·°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, "calorie_th".
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 cal/(s·cm²·°C). Retrieved October 25, 2026, from https://scientificconverters.com/heat-transfer-coefficient/btu-per-hour-square-foot-fahrenheit-to-calories-per-second-square-centimeter-celsius/
IEEE
Scientific Converters, "Convert BTU/(h·ft²·°F) to cal/(s·cm²·°C)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/heat-transfer-coefficient/btu-per-hour-square-foot-fahrenheit-to-calories-per-second-square-centimeter-celsius/