Convert Watt per square inch to International table BTU per second per square foot
Convert Watt per square inch (W/in²) to International table BTU per second per square foot (BTU(IT)/(s·ft²)) instantly and accurately.
Conversion Formula
BTU(IT)/(s·ft²) = W/in² × 0.1364856653
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 second per square foot
The international table BTU per second per square foot (BTU(IT)/(s·ft²)) equals 1055.05585262/0.09290304 ≈ 11357 W/m² (= 3600 × BTU(IT)/(h·ft²)). Used for extreme heat flux: atmospheric re-entry aerodynamic heating, solid rocket nozzle throat, and nuclear reactor thermal hydraulics design. 1 BTU(IT)/(s·ft²) ≈ 11357 W/m².
Quick Reference Table
| Watt per square inch (W/in²) | International table BTU per second per square foot (BTU(IT)/(s·ft²)) |
|---|---|
| 1 W/in² | 0.136486 BTU(IT)/(s·ft²) |
| 2 W/in² | 0.272971 BTU(IT)/(s·ft²) |
| 5 W/in² | 0.682428 BTU(IT)/(s·ft²) |
| 10 W/in² | 1.36486 BTU(IT)/(s·ft²) |
| 25 W/in² | 3.41214 BTU(IT)/(s·ft²) |
| 50 W/in² | 6.82428 BTU(IT)/(s·ft²) |
| 100 W/in² | 13.6486 BTU(IT)/(s·ft²) |