Watts per Square Inch to BTUs per Hour-Square Foot Converter
Enter the heat flux density in watts per square inch below to convert it to btus per hour-square foot.
Convert Watts per Square Inch to BTUs per Hour-Square Foot
Enter a value in watts per square inch (W/in²) to convert to btus per hour-square foot (BTU/(h·ft²)).
Watt per Square Inch to BTU per Hour-Square Foot Conversion Table
Table showing various watt per square inch measurements converted to btus per hour-square foot. Click any preset value or arrow to load it into the converter.
| Watts per Square Inch (W/in²) | BTUs per Hour-Square Foot (BTU/(h·ft²)) |
|---|---|
| 1 W/in² | 491.3483944 BTU/(h·ft²) |
| 2 W/in² | 982.6967888 BTU/(h·ft²) |
| 2.5 W/in² | 1,228.370986 BTU/(h·ft²) |
| 5 W/in² | 2,456.741972 BTU/(h·ft²) |
| 10 W/in² | 4,913.483944 BTU/(h·ft²) |
| 15 W/in² | 7,370.225916 BTU/(h·ft²) |
| 20 W/in² | 9,826.967888 BTU/(h·ft²) |
| 25 W/in² | 12,283.70986 BTU/(h·ft²) |
| 30 W/in² | 14,740.451832 BTU/(h·ft²) |
| 50 W/in² | 24,567.41972 BTU/(h·ft²) |
How to Convert Watts per Square Inch to BTUs per Hour-Square Foot
To convert watts per square inch to btus per hour-square foot, multiply the heat flux density by the following conversion ratio: 491.3483944 btus per hour-square foot/watt per square inch.
Since one watt per square inch is equal to 491.3483944 btus per hour-square foot, you can use this simple formula to convert:
The heat flux density in btus per hour-square foot is equal to the heat flux density in watts per square inch multiplied by 491.3483944.
For example, here's how to convert 5 watts per square inch to btus per hour-square foot using the formula above.
How Many BTUs per Hour-Square Foot Are in a Watt per Square Inch?
There are 491.3483944 btus per hour-square foot in a watt per square inch, which is why we use this value in the formula above.
Our watt per square inch to btu per hour-square foot calculator automatically converts your heat flux density measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Watts per Square Inch and btus per hour-square foot are both units used to measure heat flux density. Keep reading to learn more about each unit.
What Is a Watt per Square Inch?
A watt per square inch is a unit of heat flux density equal to 1,550.0031 watts per square meter (W/m²), the base unit for heat flux density. Heater element surface watt density unit (≈ 1,550 W/m²). [1]
The watt per square inch is classified as a US customary unit of heat flux density. Watts per Square Inch can be abbreviated as W/in²; for example, 1 watt per square inch can be written as 1 W/in².
When working with watts per square inch (W/in²) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, watts per square inch (W/in²) are widely used across large-scale industrial, bulk, and macro-level heat flux density specifications within US customary workflows, engineering documentation, and technical data sheets.
What Is a BTU per Hour-Square Foot?
A btu per hour-square foot is a unit of heat flux density equal to 3.1545908 watts per square meter (W/m²), the base unit for heat flux density. US HVAC heat flux unit (≈ 3.1546 W/m²). [2]
The btu per hour-square foot is classified as a US customary unit of heat flux density. BTUs per Hour-Square Foot can be abbreviated as BTU/(h·ft²); for example, 1 btu per hour-square foot can be written as 1 BTU/(h·ft²).
When working with btus per hour-square foot (BTU/(h·ft²)) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, btus per hour-square foot (BTU/(h·ft²)) are widely used across standard heat flux density applications within US customary workflows, engineering documentation, and technical data sheets.
When converting heat flux density between watts per square inch (W/in²) and btus per hour-square foot (BTU/(h·ft²)), keep full floating-point precision (1 W/in² = 491.3483944 BTU/(h·ft²); 1 BTU/(h·ft²) = 0.0020352 W/in²) during intermediate calculations and round only the final btu per hour-square foot figure to match your instrument tolerance.
More Watt per Square Inch & BTU per Hour-Square Foot Conversions
Need to calculate in the opposite direction? Use our btus per hour-square foot to watts per square inch calculator to switch your starting unit immediately. You can also explore related tools such as converting btus per hour-square foot to watts per square inch, converting watts per square inch to watts per square meter, or converting watts per square meter to kilowatts per square meter.
Convert from Watts per Square Inch
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Heat Flux Density Metrology Standard — Watts per Square Inch (W/in²) to BTUs per Hour-Square Foot (BTU/(h·ft²))
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Watt per Square Inch (W/in²) & BTU per Hour-Square Foot (BTU/(h·ft²))
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (W/in² to BTU/(h·ft²))