watt per square inch to it btu per hour square foot
Convert watt per square inch (W/in²) to it btu per hour square foot (BTU IT/(h·ft²)). Use an editable heat flux converter, conversion formula, and reference table.
1 W/in² = 491.3483952 BTU IT/(h·ft²)
Conversion formula
One watt per square inch equals 491.3483952 it btu per hour square foot. Multiply your value in watt per square inch by this factor to get it btu per hour square foot. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 watt per square inch:5 × 491.3483952 = 2,456.741976 BTU IT/(h·ft²)
Conversion table
| watt per square inch (W/in²) | it btu per hour square foot (BTU IT/(h·ft²)) |
|---|---|
| 0.01 | 4.913483952 |
| 0.1 | 49.13483952 |
| 1 | 491.3483952 |
| 2 | 982.6967903 |
| 5 | 2,456.741976 |
| 10 | 4,913.483952 |
| 25 | 12,283.70988 |
| 50 | 24,567.41976 |
| 100 | 49,134.83952 |
| 1000 | 491,348.3952 |
About these measurements
Heat flux is thermal power per unit surface area.
The base reference used here is the watt per square meter. One watt per square inch is 1,550.0031 base units; one it btu per hour square foot is 3.154590745 base units.
Important distinctions
Compound units must match the quantity and dimension. Temperature intervals use size factors rather than temperature offsets. Calorie and BTU entries use the explicit definitions shown.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert W/in² to BTU IT/(h·ft²)?
Multiply the quantity in W/in² by 491.3483952. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the it btu per hour square foot to watt per square inch converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
