BTUs per Hour-Square Foot to Watts per Square Meter Converter
Enter the heat flux density in btus per hour-square foot below to convert it to watts per square meter.
Convert BTUs per Hour-Square Foot to Watts per Square Meter
Enter a value in btus per hour-square foot (BTU/(h·ft²)) to convert to watts per square meter (W/m²).
BTU per Hour-Square Foot to Watt per Square Meter Conversion Table
Table showing various btu per hour-square foot measurements converted to watts per square meter. Click any preset value or arrow to load it into the converter.
| BTUs per Hour-Square Foot (BTU/(h·ft²)) | Watts per Square Meter (W/m²) |
|---|---|
| 1 BTU/(h·ft²) | 3.1545908 W/m² |
| 2 BTU/(h·ft²) | 6.3091815 W/m² |
| 2.5 BTU/(h·ft²) | 7.8864769 W/m² |
| 5 BTU/(h·ft²) | 15.7729538 W/m² |
| 10 BTU/(h·ft²) | 31.5459075 W/m² |
| 15 BTU/(h·ft²) | 47.3188613 W/m² |
| 20 BTU/(h·ft²) | 63.091815 W/m² |
| 25 BTU/(h·ft²) | 78.8647687 W/m² |
| 30 BTU/(h·ft²) | 94.6377225 W/m² |
| 50 BTU/(h·ft²) | 157.7295375 W/m² |
How to Convert BTUs per Hour-Square Foot to Watts per Square Meter
To convert btus per hour-square foot to watts per square meter, multiply the heat flux density by the following conversion ratio: 3.1545908 watts per square meter/btu per hour-square foot.
Since one btu per hour-square foot is equal to 3.1545908 watts per square meter, you can use this simple formula to convert:
The heat flux density in watts per square meter is equal to the heat flux density in btus per hour-square foot multiplied by 3.1545908.
For example, here's how to convert 5 btus per hour-square foot to watts per square meter using the formula above.
How Many Watts per Square Meter Are in a BTU per Hour-Square Foot?
There are 3.1545908 watts per square meter in a btu per hour-square foot, which is why we use this value in the formula above.
Our btu per hour-square foot to watt per square meter calculator automatically converts your heat flux density measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
BTUs per Hour-Square Foot and watts per square meter are both units used to measure heat flux density. Keep reading to learn more about each unit.
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). [1]
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.
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. [2]
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.
When converting heat flux density between btus per hour-square foot (BTU/(h·ft²)) and watts per square meter (W/m²), keep full floating-point precision (1 BTU/(h·ft²) = 3.1545908 W/m²; 1 W/m² = 0.3169983 BTU/(h·ft²)) during intermediate calculations and round only the final watt per square meter figure to match your instrument tolerance.
More BTU per Hour-Square Foot & Watt per Square Meter Conversions
Need to calculate in the opposite direction? Use our watts per square meter to btus per hour-square foot calculator to switch your starting unit immediately. You can also explore related tools such as converting watts per square meter to btus per hour-square foot, converting kilowatts per square meter to watts per square meter, or converting watts per square centimeter to watts per square meter.
Convert from BTUs per Hour-Square Foot
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Heat Flux Density Metrology Standard — BTUs per Hour-Square Foot (BTU/(h·ft²)) to Watts per Square Meter (W/m²)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: BTU per Hour-Square Foot (BTU/(h·ft²)) & Watt per Square Meter (W/m²)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (BTU/(h·ft²) to W/m²)