Convert m²·h·°C/kcal to US R-Value
1 square metre hour degree Celsius per kilocalorie (m²·h·°C/kcal) = 4.882427636 US R-value (ft²·°F·h/BTU). 1 ft²·°F·h/BTU = 0.2048161436 m²·h·°C/kcal. Example: 15 m²·h·°C/kcal = 15 × 4.882427636 = 73.23641455 ft²·°F·h/BTU.
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1 m²·h·°C/kcal = 4.882427636 ft²·°F·h/BTU
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk square metre hour degree Celsius per kilocalorie to R (US) converter to paste a column from Excel.
How to Convert Square Metre Hour Degree Celsius per Kilocalorie to US R-Value
- 1 m²·h·°C/kcal = 4.882427636 ft²·°F·h/BTU
- 1 ft²·°F·h/BTU = 0.2048161436 m²·h·°C/kcal
- Example: convert 15 m²·h·°C/kcal to ft²·°F·h/BTU: 15 m²·h·°C/kcal = 15 × 4.882427636 ft²·°F·h/BTU = 73.23641455 ft²·°F·h/BTU
Reference conditions. m²·h·°C/kcal: International Table kilocalorie (4186.8 J).
Formula
ft²·°F·h/BTU = m²·h·°C/kcal × 4.882427636383
Derivation from SI units:
- 1 m²·h·°C/kcal_IT = 3600 s ÷ 4186.8 J × m²·K ≈ 0.85985 m²·K/W.
- 1 ft²·°F·h/BTU_IT = 0.09290304 m² × (5/9) K × 3600 s ÷ 1055.05585262 J ≈ 0.17611 m²·K/W.
- 1 m²·h·°C/kcal = 0.859845227859 m²·K/W ÷ 0.1761101836823 m²·K/W per ft²·°F·h/BTU = 4.882427636383 ft²·°F·h/BTU
Both units are defined exactly, so the factor is exact. Square Metre Hour Degree Celsius per Kilocalorie definition: square metre hour degree Celsius per kilocalorie; US R-Value definition: US R-value.
Worked examples
- A reading of 1.5 m²·h·°C/kcal converts to 7.323641455 ft²·°F·h/BTU.
1.5 m²·h·°C/kcal × 4.882427636 = 7.323641455 ft²·°F·h/BTU - A value of 3 m²·h·°C/kcal is 14.64728291 ft²·°F·h/BTU.
3 m²·h·°C/kcal × 4.882427636 = 14.64728291 ft²·°F·h/BTU
Square Metre Hour Degree Celsius per Kilocalorie to US R-Value conversion table
| Square Metre Hour Degree Celsius per Kilocalorie (m²·h·°C/kcal) | US R-Value (ft²·°F·h/BTU) |
|---|---|
| 0.1 m²·h·°C/kcal | 0.4882427636 ft²·°F·h/BTU |
| 0.5 m²·h·°C/kcal | 2.441213818 ft²·°F·h/BTU |
| 1 m²·h·°C/kcal | 4.882427636 ft²·°F·h/BTU |
| 1.5 m²·h·°C/kcal | 7.323641455 ft²·°F·h/BTU |
| 2 m²·h·°C/kcal | 9.764855273 ft²·°F·h/BTU |
| 2.5 m²·h·°C/kcal | 12.20606909 ft²·°F·h/BTU |
| 3 m²·h·°C/kcal | 14.64728291 ft²·°F·h/BTU |
| 4 m²·h·°C/kcal | 19.52971055 ft²·°F·h/BTU |
| 5 m²·h·°C/kcal | 24.41213818 ft²·°F·h/BTU |
| 6 m²·h·°C/kcal | 29.29456582 ft²·°F·h/BTU |
Where it's used
Square Metre Hour Degree Celsius per Kilocalorie are used for older building-physics texts and IS codes, while US R-value appear in US insulation labels (R-13, R-19, R-38). Both measure thermal resistance per unit area (insulation R-value), so the conversion is a fixed factor.
Square Metre Hour Degree Celsius per Kilocalorie to other thermal resistance (r-value) units
| Conversion | 1 m²·h·°C/kcal equals |
|---|---|
| square metre hour degree Celsius per kilocalorie to R (US) | 4.882427636 ft²·°F·h/BTU |
| square metre hour degree Celsius per kilocalorie to RSI | 0.8598452279 m²·K/W |
| square metre hour degree Celsius per kilocalorie to clo | 5.547388567 clo |
| square metre hour degree Celsius per kilocalorie to tog | 8.598452279 tog |
Frequently asked questions
How many US R-value are in 1 square metre hour degree Celsius per kilocalorie?
1 m²·h·°C/kcal = 4.882427636 ft²·°F·h/BTU.
How do I convert square metre hour degree Celsius per kilocalorie to US R-value?
Multiply the value in m²·h·°C/kcal by 4.882427636. For example, 15 m²·h·°C/kcal × 4.882427636 = 73.23641455 ft²·°F·h/BTU.
Is the m²·h·°C/kcal to ft²·°F·h/BTU 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, "calorie_IT".
- 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, "degree Fahrenheit hour square foot per British thermal unit_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 m²·h·°C/kcal to US R-Value. Retrieved October 29, 2026, from https://scientificconverters.com/thermal-resistance/square-meter-hour-celsius-per-kilocalorie-to-r-value/
IEEE
Scientific Converters, "Convert m²·h·°C/kcal to US R-Value," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/thermal-resistance/square-meter-hour-celsius-per-kilocalorie-to-r-value/