Convert Watt per square metre to International table BTU per hour per square inch
Convert Watt per square metre (W/m²) to International table BTU per hour per square inch (BTU(IT)/(h·in²)) instantly and accurately.
Conversion Formula
BTU(IT)/(h·in²) = W/m² × 0.002201377296
About Watt per square metre
The watt per square metre (W/m²) is the SI coherent unit for heat flux density and irradiance. Solar irradiance at Earth's surface ≈ 1000 W/m²; solar constant ≈ 1361 W/m²; human skin radiative emission ≈ 100 W/m²; global average geothermal flux ≈ 0.087 W/m². Referenced in ISO 80000-4. 1 W/m² = 1 J/(s·m²) = 10⁻³ kW/m².
About International table BTU per hour per square inch
The international table BTU per hour per square inch (BTU(IT)/(h·in²)) equals 1055.05585262/(3600×6.4516×10⁻⁴) ≈ 454.26 W/m². Used for high heat flux applications such as electronic component cooling, jet engine combustor walls, and nuclear fuel assembly design in US customary units. 1 BTU(IT)/(h·in²) ≈ 454.26 W/m².
Quick Reference Table
| Watt per square metre (W/m²) | International table BTU per hour per square inch (BTU(IT)/(h·in²)) |
|---|---|
| 1 W/m² | 0.00220138 BTU(IT)/(h·in²) |
| 2 W/m² | 0.00440275 BTU(IT)/(h·in²) |
| 5 W/m² | 0.0110069 BTU(IT)/(h·in²) |
| 10 W/m² | 0.0220138 BTU(IT)/(h·in²) |
| 25 W/m² | 0.0550344 BTU(IT)/(h·in²) |
| 50 W/m² | 0.110069 BTU(IT)/(h·in²) |
| 100 W/m² | 0.220138 BTU(IT)/(h·in²) |