BTU per hour square foot (BTU/(h·ft²))
One BTU (IT) per hour through one square foot.
What is a BTU per hour square foot?
- Symbol
- BTU/(h·ft²)
- Quantity
- Heat Flux Density
- Unit system
- US customary
- Definition
- One BTU (IT) per hour through one square foot.
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
Used in US HVAC load calculations, solar heat gain and radiant heating design.
BTU per hour square foot in other heat flux density units
- 1 BTU/(h·ft²) ≈ 3.154590745 W/m²BTU per hour square foot to Watt per square meter converter
- 1 BTU/(h·ft²) ≈ 0.003154590745 kW/m²Kilowatt per square meter
- 1 BTU/(h·ft²) ≈ 0.0003154590745 W/cm²Watt per square centimeter
- 1 BTU/(h·ft²) ≈ 2.712459798 kcal/(h·m²)Kilocalorie (IT) per hour square meter
- 1 BTU/(h·ft²) ≈ 0.00007539652832 cal/(s·cm²)Calorie (thermochemical) per second square centimeter
BTU per hour square foot quick reference
| BTU per hour square foot | Watt per square meter | Kilowatt per square meter | Watt per square centimeter |
|---|---|---|---|
| 1 BTU/(h·ft²) | ≈ 3.154590745 W/m² | ≈ 0.003154590745 kW/m² | ≈ 0.0003154590745 W/cm² |
| 10 BTU/(h·ft²) | ≈ 31.54590745 W/m² | ≈ 0.03154590745 kW/m² | ≈ 0.003154590745 W/cm² |
| 100 BTU/(h·ft²) | ≈ 315.4590745 W/m² | ≈ 0.3154590745 kW/m² | ≈ 0.03154590745 W/cm² |
| 1000 BTU/(h·ft²) | ≈ 3154.590745 W/m² | ≈ 3.154590745 kW/m² | ≈ 0.3154590745 W/cm² |
Where the BTU per hour square foot fits
The next smaller heat flux density unit is the kilocalorie (IT) per hour square meter (kcal/(h·m²)). 1 BTU/(h·ft²) ≈ 2.712459798 kcal/(h·m²), and 1 kcal/(h·m²) ≈ 0.3686690585 BTU/(h·ft²).
The next larger heat flux density unit is the kilowatt per square meter (kW/m²). 1 BTU/(h·ft²) ≈ 0.003154590745 kW/m², and 1 kW/m² ≈ 316.9983306 BTU/(h·ft²).
Frequently asked questions
- How many watts per square meter are in one BTU per hour square foot?
- One BTU per hour square foot ≈ 3.154590745 W/m² (watts per square meter).
- How many kilowatts per square meter are in one BTU per hour square foot?
- One BTU per hour square foot ≈ 0.003154590745 kW/m² (kilowatts per square meter).
- How many watts per square centimeter are in one BTU per hour square foot?
- One BTU per hour square foot ≈ 0.0003154590745 W/cm² (watts per square centimeter).