Convert Watt per square millimetre to International table BTU per hour per square inch
Convert Watt per square millimetre (W/mm²) to International table BTU per hour per square inch (BTU(IT)/(h·in²)) instantly and accurately.
Conversion Formula
BTU(IT)/(h·in²) = W/mm² × 2201.377296
About Watt per square millimetre
The watt per square millimetre (W/mm²) equals exactly 10⁶ W/m². Used in high-power laser material processing - cutting, welding, and additive manufacturing - and electron beam applications. A 1 kW laser focused to 1 mm² achieves 1 W/mm². Numerically equal to MW/m². 1 W/mm² = 10⁶ W/m² = 100 W/cm².
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 millimetre (W/mm²) | International table BTU per hour per square inch (BTU(IT)/(h·in²)) |
|---|---|
| 1 W/mm² | 2201.38 BTU(IT)/(h·in²) |
| 2 W/mm² | 4402.75 BTU(IT)/(h·in²) |
| 5 W/mm² | 11006.9 BTU(IT)/(h·in²) |
| 10 W/mm² | 22013.8 BTU(IT)/(h·in²) |
| 25 W/mm² | 55034.4 BTU(IT)/(h·in²) |
| 50 W/mm² | 110069 BTU(IT)/(h·in²) |
| 100 W/mm² | 220138 BTU(IT)/(h·in²) |