Skip to content

Watts per square meter to BTU per hour-square foot

Convert watts per square meter to BTU per hour-square foot, with the math shown step by step.

Favorite
BTU per hour-square foot
126.8 BTU/(h·ft²)

400 W/m² = 126.8 BTU/(h·ft²)

Also equals

How it works

BTU/(h·ft²) = W/m² ÷ 3.15459075

One BTU per hour-square foot is about 3.15459075 watts per square meter, so dividing by 3.15459075 turns watts per square meter into BTU per hour-square foot. For example, 1,000 W/m² is about 317 BTU/(h·ft²).

  1. Divide by 3.15459075 400 ÷ 3.15459075 = 126.8 BTU/(h·ft²)

Nearby values

Watts per square meter BTU per hour-square foot Kilocalories per hour-square meter Kilowatts per square meter
100 W/m² 31.7 BTU/(h·ft²) 86.04 0.1
200 W/m² 63.4 BTU/(h·ft²) 172.08 0.2
300 W/m² 95.1 BTU/(h·ft²) 258.13 0.3
400 W/m² 126.8 BTU/(h·ft²) 344.17 0.4
500 W/m² 158.5 BTU/(h·ft²) 430.21 0.5
600 W/m² 190.2 BTU/(h·ft²) 516.25 0.6
700 W/m² 221.9 BTU/(h·ft²) 602.29 0.7

Printed from rocketcalc.io/heat-flux/w-per-m2-to-btu-per-h-ft2/400