Convert Watt per square inch to Watt per square millimetre
Convert Watt per square inch (W/in²) to Watt per square millimetre (W/mm²) instantly and accurately.
Conversion Formula
W/mm² = W/in² × 0.0015500031
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 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.
Quick Reference Table
| Watt per square inch (W/in²) | Watt per square millimetre (W/mm²) |
|---|---|
| 1 W/in² | 0.00155 W/mm² |
| 2 W/in² | 0.00310001 W/mm² |
| 5 W/in² | 0.00775002 W/mm² |
| 10 W/in² | 0.0155 W/mm² |
| 25 W/in² | 0.0387501 W/mm² |
| 50 W/in² | 0.0775002 W/mm² |
| 100 W/in² | 0.155 W/mm² |