Convert Thermochemical kilocalorie per hour per square metre to International table BTU per hour per square foot
Convert Thermochemical kilocalorie per hour per square metre (kcal(th)/(h·m²)) to International table BTU per hour per square foot (BTU(IT)/(h·ft²)) instantly and accurately.
Conversion Formula
BTU(IT)/(h·ft²) = kcal(th)/(h·m²) × 0.3684225043
About Thermochemical kilocalorie per hour per square metre
The thermochemical kilocalorie per hour per square metre (kcal(th)/(h·m²)) equals 4184/3600 ≈ 1.1622 W/m² (1 kcal(th) = 4184 J; 1 h = 3600 s). Used in older continental European and Soviet-era building physics standards for wall and roof heat loss calculations. 1 kcal(th)/(h·m²) ≈ 1.1622 W/m².
About International table BTU per hour per square foot
The international table BTU per hour per square foot (BTU(IT)/(h·ft²)) equals 1055.05585262/(3600×0.09290304) ≈ 3.15459 W/m². The standard US heat flux unit in ASHRAE, ASTM, and building codes for thermal resistance (R-value), boiler ratings, and heat exchanger design. 1 BTU(IT)/(h·ft²) ≈ 3.15459 W/m².
Quick Reference Table
| Thermochemical kilocalorie per hour per square metre (kcal(th)/(h·m²)) | International table BTU per hour per square foot (BTU(IT)/(h·ft²)) |
|---|---|
| 1 kcal(th)/(h·m²) | 0.368423 BTU(IT)/(h·ft²) |
| 2 kcal(th)/(h·m²) | 0.736845 BTU(IT)/(h·ft²) |
| 5 kcal(th)/(h·m²) | 1.84211 BTU(IT)/(h·ft²) |
| 10 kcal(th)/(h·m²) | 3.68423 BTU(IT)/(h·ft²) |
| 25 kcal(th)/(h·m²) | 9.21056 BTU(IT)/(h·ft²) |
| 50 kcal(th)/(h·m²) | 18.4211 BTU(IT)/(h·ft²) |
| 100 kcal(th)/(h·m²) | 36.8423 BTU(IT)/(h·ft²) |