BTU per square foot (BTU/ft²)
One BTU (IT) per square foot.
What is a BTU per square foot?
- Symbol
- BTU/ft²
- Quantity
- Heat Density
- Unit system
- US customary
- Definition
- One BTU (IT) per square foot.
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
Used in the United States for solar radiation data and for building energy use per floor area, often in thousands (kBtu/ft²).
BTU per square foot in other heat density units
- 1 BTU/ft² ≈ 11356.52668 J/m²Joule per square meter
- 1 BTU/ft² ≈ 11.35652668 kJ/m²BTU per square foot to Kilojoule per square meter converter
- 1 BTU/ft² ≈ 0.01135652668 MJ/m²Megajoule per square meter
- 1 BTU/ft² ≈ 0.003154590745 kWh/m²Kilowatt-hour per square meter
- 1 BTU/ft² ≈ 0.271427502 LyLangley
BTU per square foot quick reference
| BTU per square foot | Kilojoule per square meter | Joule per square meter | Megajoule per square meter |
|---|---|---|---|
| 1 BTU/ft² | ≈ 11.35652668 kJ/m² | ≈ 11356.52668 J/m² | ≈ 0.01135652668 MJ/m² |
| 10 BTU/ft² | ≈ 113.5652668 kJ/m² | ≈ 113565.2668 J/m² | ≈ 0.1135652668 MJ/m² |
| 100 BTU/ft² | ≈ 1135.652668 kJ/m² | ≈ 1135652.668 J/m² | ≈ 1.135652668 MJ/m² |
| 1000 BTU/ft² | ≈ 11356.52668 kJ/m² | ≈ 11356526.68 J/m² | ≈ 11.35652668 MJ/m² |
Where the BTU per square foot fits
The next smaller heat density unit is the kilojoule per square meter (kJ/m²). 1 BTU/ft² ≈ 11.35652668 kJ/m², and 1 kJ/m² ≈ 0.08805509184 BTU/ft².
The next larger heat density unit is the langley (Ly). 1 BTU/ft² ≈ 0.271427502 Ly, and 1 Ly ≈ 3.684225043 BTU/ft².
Frequently asked questions
- How many kilojoules per square meter are in one BTU per square foot?
- One BTU per square foot ≈ 11.35652668 kJ/m² (kilojoules per square meter).
- How many joules per square meter are in one BTU per square foot?
- One BTU per square foot ≈ 11356.52668 J/m² (joules per square meter).
- How many megajoules per square meter are in one BTU per square foot?
- One BTU per square foot ≈ 0.01135652668 MJ/m² (megajoules per square meter).