Convert heat flux units including watts per square meter, kilowatts per square meter, BTU per hour-square foot, calories per second-square centimeter, watts per square inch, and more.
W/m² to BTU/hr-ft²:
1 W/m² = 0.317 BTU/(hr·ft²)
BTU/hr-ft² to W/m²:
1 BTU/(hr·ft²) = 3.15459 W/m²
kW/m² to W/m²:
1 kW/m² = 1,000 W/m²
cal/(s·cm²) to W/m²:
1 cal/(s·cm²) = 41,840 W/m²
Heat flux conversions are useful for heat exchangers, insulation design, electronics cooling, furnace walls, solar radiation, thermal protection systems, HVAC surfaces, boilers, and process heat transfer.
Use this converter when comparing SI, U.S. customary, and CGS heat flux units.
Your result shows the entered heat flux converted from the starting unit into the selected ending unit. The calculator also shows the conversion rate used so you can verify the calculation.
For engineering and thermal design, make sure the heat flux unit matches your heat transfer equation, material data, surface area calculation, equipment rating, or thermal model.
Heat flux is the heat transfer rate per unit surface area.
The SI unit of heat flux is watts per square meter, abbreviated as W/m².
No. Heat transfer rate is total heat per time, while heat flux is heat transfer rate divided by area.
One BTU per hour-square foot equals approximately 3.15459 W/m².
This converter is designed for heat flux magnitude conversions, so it uses non-negative values.