BTU per hour square foot to Watt per square meter Converter
1 BTU per hour square foot is about 3.154590745 watts per square meter. Convert BTUs per hour square foot (BTU/(h·ft²)) to watts per square meter (W/m²) below: type a value and the result updates as you type.
BTU/(h·ft²) to W/m² calculator
Result
BTU per hour square foot to Watt per square meter conversion
1 BTU/(h·ft²) ≈ 3.154590745 W/m²one BTU per hour square foot in watts per square meter
1 W/m² ≈ 0.3169983306 BTU/(h·ft²)one watt per square meter in BTUs per hour square foot
BTU per hour square foot (BTU/(h·ft²)): One BTU (IT) per hour through one square foot.
Watt per square meter (W/m²): SI unit of heat flux density and irradiance. Full sunlight at ground level is roughly 1000 W/m².
Source:BTU per hour square foot: NIST Special Publication 811 (2008), Appendix B.8; Watt per square meter: SI Brochure, 9th edition (BIPM, 2019)
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 number of BTUs per hour square foot by about 3.154590745.
Formula
W/m² = BTU/(h·ft²) × 3.154590745
The factor is rounded here. The calculator uses the exact value.
Examples
- 5 BTU/(h·ft²) = 5 × 3.154590745 ≈ 15.77295373 W/m²
- 25 BTU/(h·ft²) = 25 × 3.154590745 ≈ 78.86476863 W/m²
- 100 BTU/(h·ft²) = 100 × 3.154590745 ≈ 315.4590745 W/m²
BTU per hour square foot to Watt per square meter conversion table
| BTU per hour square foot (BTU/(h·ft²)) | Watt per square meter (W/m²) |
|---|---|
| 0.1 BTU/(h·ft²) | 0.3154590745 W/m² |
| 0.5 BTU/(h·ft²) | 1.577295373 W/m² |
| 1 BTU/(h·ft²) | 3.154590745 W/m² |
| 2 BTU/(h·ft²) | 6.30918149 W/m² |
| 3 BTU/(h·ft²) | 9.463772235 W/m² |
| 5 BTU/(h·ft²) | 15.77295373 W/m² |
| 10 BTU/(h·ft²) | 31.54590745 W/m² |
| 20 BTU/(h·ft²) | 63.0918149 W/m² |
| 25 BTU/(h·ft²) | 78.86476863 W/m² |
| 50 BTU/(h·ft²) | 157.7295373 W/m² |
| 100 BTU/(h·ft²) | 315.4590745 W/m² |
| 250 BTU/(h·ft²) | 788.6476863 W/m² |
| 500 BTU/(h·ft²) | 1577.295373 W/m² |
| 1000 BTU/(h·ft²) | 3154.590745 W/m² |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many watts per square meter are in one BTU per hour square foot?
- One BTU per hour square foot is about 3.154590745 watts per square meter.
- How do I 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 number of watts per square meter by about 0.3169983306. The formula is BTU/(h·ft²) = W/m² × 0.3169983306.
- Is this conversion exact?
- Yes. Both units have exact definitions, but the factor has more decimal places than can be shown, so displayed results are rounded. The calculator works with 50 significant digits before rounding.
- Which is larger, a BTU per hour square foot or a watt per square meter?
- A BTU per hour square foot is about 3.154590745 times larger than a watt per square meter. In other words, a watt per square meter is about 0.3169983306 of a BTU per hour square foot.