Convert Watt per square inch to International table BTU per hour per square foot
Convert Watt per square inch (W/in²) to International table BTU per hour per square foot (BTU(IT)/(h·ft²)) instantly and accurately.
Conversion Formula
BTU(IT)/(h·ft²) = W/in² × 491.3483952
About Watt per square inch
The watt per square inch (W/in²) equals 1/(6.4516×10⁻⁴) ≈ 1550.003 W/m² (1 in = 0.0254 m). Used in US electronics thermal management for PCB power density, semiconductor die heat flux, and power module ratings. 1 W/in² ≈ 1550 W/m² ≈ 0.155 W/cm².
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
| Watt per square inch (W/in²) | International table BTU per hour per square foot (BTU(IT)/(h·ft²)) |
|---|---|
| 1 W/in² | 491.348 BTU(IT)/(h·ft²) |
| 2 W/in² | 982.697 BTU(IT)/(h·ft²) |
| 5 W/in² | 2456.74 BTU(IT)/(h·ft²) |
| 10 W/in² | 4913.48 BTU(IT)/(h·ft²) |
| 25 W/in² | 12283.7 BTU(IT)/(h·ft²) |
| 50 W/in² | 24567.4 BTU(IT)/(h·ft²) |
| 100 W/in² | 49134.8 BTU(IT)/(h·ft²) |