Watts per Square Meter to BTUs per Hour-Square Foot Converter
Enter the heat flux density in watts per square meter below to convert it to btus per hour-square foot.
Convert Watts per Square Meter to BTUs per Hour-Square Foot
Enter a value in watts per square meter (W/m²) to convert to btus per hour-square foot (BTU/(h·ft²)).
Watt per Square Meter to BTU per Hour-Square Foot Conversion Table
Table showing various watt per square meter measurements converted to btus per hour-square foot. Click any preset value or arrow to load it into the converter.
| Watts per Square Meter (W/m²) | BTUs per Hour-Square Foot (BTU/(h·ft²)) |
|---|---|
| 1 W/m² | 0.3169983 BTU/(h·ft²) |
| 2 W/m² | 0.6339967 BTU/(h·ft²) |
| 2.5 W/m² | 0.7924958 BTU/(h·ft²) |
| 5 W/m² | 1.5849917 BTU/(h·ft²) |
| 10 W/m² | 3.1699833 BTU/(h·ft²) |
| 15 W/m² | 4.754975 BTU/(h·ft²) |
| 20 W/m² | 6.3399666 BTU/(h·ft²) |
| 25 W/m² | 7.9249583 BTU/(h·ft²) |
| 30 W/m² | 9.5099499 BTU/(h·ft²) |
| 50 W/m² | 15.8499165 BTU/(h·ft²) |
How to Convert Watts per Square Meter to BTUs per Hour-Square Foot
To convert watts per square meter to btus per hour-square foot, multiply the heat flux density by the following conversion ratio: 0.3169983 btus per hour-square foot/watt per square meter.
Since one watt per square meter is equal to 0.3169983 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 meter multiplied by 0.3169983.
For example, here's how to convert 5 watts per square meter to btus per hour-square foot using the formula above.
How Many BTUs per Hour-Square Foot Are in a Watt per Square Meter?
There are 0.3169983 btus per hour-square foot in a watt per square meter, which is why we use this value in the formula above.
Our watt per square meter 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 Meter 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 Meter?
SI unit of heat flux density and solar irradiance. It serves as a primary reference unit for measuring heat flux density across scientific and practical applications. [1]
The watt per square meter is classified as an International System of Units (SI) unit of heat flux density. Watts per Square Meter can be abbreviated as W/m²; for example, 1 watt per square meter can be written as 1 W/m².
As the primary coherent reference unit for heat flux density in this category, all other heat flux density units are mathematically anchored to the watt per square meter (W/m²).
In practice, watts per square meter (W/m²) are widely used across standard heat flux density applications within International System of Units (SI) 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 meter (W/m²) and btus per hour-square foot (BTU/(h·ft²)), keep full floating-point precision (1 W/m² = 0.3169983 BTU/(h·ft²); 1 BTU/(h·ft²) = 3.1545908 W/m²) during intermediate calculations and round only the final btu per hour-square foot figure to match your instrument tolerance.
More Watt per Square Meter & BTU per Hour-Square Foot Conversions
Need to calculate in the opposite direction? Use our btus per hour-square foot to watts per square meter 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 meter, converting watts per square meter to kilowatts per square meter, or converting watts per square meter to watts per square centimeter.
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Heat Flux Density Metrology Standard — Watts per Square Meter (W/m²) to BTUs per Hour-Square Foot (BTU/(h·ft²))
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Watt per Square Meter (W/m²) & 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/m² to BTU/(h·ft²))