Convert joule per square meter to btu (it) per square foot instantly. Type in either field — results update live.
Selected J/m² values converted to BTU (IT)/ft² using the exact factor from this tool.
| J/m² | BTU (IT)/ft² |
|---|---|
| 0.01 | 8.805507e-7 |
| 0.1 | 0.0000088055 |
| 1 | 0.0000880551 |
| 2 | 0.0001761101 |
| 3 | 0.0002641652 |
| 5 | 0.0004402753 |
| 10 | 0.0008805507 |
| 20 | 0.0017611013 |
| 50 | 0.0044027533 |
| 100 | 0.0088055066 |
| 1,000 | 0.0880550661 |
Exact conversion factors in both directions, plus a worked example.
1 J/m² = 0.0000880551 BTU (IT)/ft²
1 BTU (IT)/ft² = 11356.53 J/m²
To convert joule per square meter to btu (it) per square foot, multiply by 0.0000880551.
To convert btu (it) per square foot to joule per square meter, multiply by 11356.53.
Example: convert 10 J/m² to BTU (IT)/ft²
10 × 0.0000880551 = 0.0008805507 BTU (IT)/ft²
Short background on the units used in this conversion.
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.
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)/ft² = J/m² × 0.0000880551J/m² = BTU (IT)/ft² × 11,356.53, using the same exact factors as this converter.Jump to any heat density conversion starting from joule per square meter — including the reverse direction and every other unit in our dataset.