Convert heat flux density between W/m², kW/m², cal/(s·cm²) and BTU/(h·ft²).
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Heat Flux Density Converter
Heat • 6 units
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Enter a value to convert
Result
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Conversion Factor
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In W/m²
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Visual Comparison
All Units
How to Use the Heat Flux Density Converter
Enter a value — type any number. Invalid text and symbols are blocked automatically.
Select From and To units — choose the units to convert between.
Read the animated result — the converted value, factor, and full reference table update instantly.
Use Swap (⇄) — reverse the conversion in one click.
Why Use This Heat Flux Density Converter
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Accurate Standards
Built on internationally recognised SI and standards-body conversion factors for dependable results.
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Instant & Animated
Results update live as you type, with a clear visual breakdown across every unit at once.
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100% Private
Everything runs in your browser — no account, no uploads, nothing leaves your device.
Common Heat Flux Density Converter Values
Quick reference — 1 Watt/meter² (W/m²) is equal to:
Kilowatt/meter²
kW/m²
0.001
Watt/centimeter²
W/cm²
0.0001
Calorie/(s·cm²)
cal/(s·cm²)
0.0000239006
BTU/(h·ft²)
BTU/(h·ft²)
0.316998305
Kilocalorie/(h·m²)
kcal/(h·m²)
0.859845228
Heat Flux Density Converter FAQ
It is the rate of heat energy transfer per unit area, measured in watts per square metre (W/m²). Solar irradiance at Earth's surface peaks around 1,000 W/m².