BTU (IT) per Square Foot (BTU (IT)/ft²)
BTU (IT) per square foot is an imperial heat density unit equal to about 11356.53 J/m².
BTU per square foot rates radiative or accumulated thermal energy in US HVAC and building energy tables.
BTU (IT) per Square Foot to Joule per Square Meter
Convert btu (it) per square foot to joule per square meter instantly. Type in either field — results update live.
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Heat Density BTU (IT) per Square Foot Joule per Square Meter
1 btu (it) per square foot = 11,356.53 joules per square meter
Unit
Unit
Conversion table
Selected BTU (IT)/ft² values converted to J/m² using the exact factor from this tool.
| BTU (IT)/ft² | J/m² |
|---|---|
| 0.01 | 113.5653 |
| 0.1 | 1,135.653 |
| 1 | 11,356.53 |
| 2 | 22,713.06 |
| 3 | 34,069.59 |
| 5 | 56,782.65 |
| 10 | 113,565.3 |
| 20 | 227,130.6 |
| 50 | 567,826.5 |
| 100 | 1,135,653 |
| 1,000 | 11,356,530 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 BTU (IT)/ft² = 11356.53 J/m²
1 J/m² = 0.0000880551 BTU (IT)/ft²
To convert btu (it) per square foot to joule per square meter, multiply by 11356.53.
To convert joule per square meter to btu (it) per square foot, multiply by 0.0000880551.
Example: convert 10 BTU (IT)/ft² to J/m²
10 × 11356.53 = 113565.3 J/m²
About these units
Short background on the units used in this conversion.
Joule per Square Meter (J/m²)
The joule per square meter (J/m²) is the SI unit of heat density — thermal energy accumulated per unit area.
Joules per square meter quantify solar exposure, radiative heating loads, and areal energy deposition in building and climate science.
Frequently asked questions
How many joules per square meter are in one btu (it) per square foot?
One btu (it) per square foot equals 11,356.53 joules per square meter. Multiply your BTU (IT) per square foot value by 11,356.53 to convert to joules per square meter.
What is the conversion formula?
J/m² = BTU (IT)/ft² × 11,356.53The reverse is
BTU (IT)/ft² = J/m² × 0.0000880551, using the same exact factors as this converter.Is this BTU (IT) per Square Foot to Joule per Square Meter converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.
All btu (it) per square foot conversions
Jump to any heat density conversion starting from btu (it) per square foot — including the reverse direction and every other unit in our dataset.