How to convert BTU per square foot to joules per square meter
J/m² = BTU/ft² × 11,356.52668Multiply the value in BTU per square foot by 11,356.52668. To go the other way, multiply by 0.00008805509184 (or divide by 11,356.52668).
A BTU per square foot is larger than a joule per square meter: one BTU per square foot contains 11,356.52668 joules per square meter.
Worked examples
- 1 BTU per square foot1 BTU/ft² × 11,356.52668 = 11,356.52668 J/m²
- 5 BTU per square foot5 BTU/ft² × 11,356.52668 = 56,782.63341 J/m²
- 10 BTU per square foot10 BTU/ft² × 11,356.52668 = 113,565.2668 J/m²
- 20 BTU per square foot20 BTU/ft² × 11,356.52668 = 227,130.5336 J/m²
- 100 BTU per square foot100 BTU/ft² × 11,356.52668 = 1,135,652.668 J/m²
BTU per square foot to joules per square meter conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| BTU per square foot (BTU/ft²) | Joules per square meter (J/m²) |
|---|---|
| 0.1 BTU/ft² | 1,135.6527 J/m² |
| 0.25 BTU/ft² | 2,839.1317 J/m² |
| 0.5 BTU/ft² | 5,678.2633 J/m² |
| 1 BTU/ft² | 11,356.527 J/m² |
| 2 BTU/ft² | 22,713.053 J/m² |
| 3 BTU/ft² | 34,069.58 J/m² |
| 4 BTU/ft² | 45,426.107 J/m² |
| 5 BTU/ft² | 56,782.633 J/m² |
| 6 BTU/ft² | 68,139.16 J/m² |
| 7 BTU/ft² | 79,495.687 J/m² |
| 8 BTU/ft² | 90,852.213 J/m² |
| 9 BTU/ft² | 102,208.74 J/m² |
| 10 BTU/ft² | 113,565.27 J/m² |
| BTU per square foot (BTU/ft²) | Joules per square meter (J/m²) |
|---|---|
| 12 BTU/ft² | 136,278.32 J/m² |
| 15 BTU/ft² | 170,347.9 J/m² |
| 20 BTU/ft² | 227,130.53 J/m² |
| 25 BTU/ft² | 283,913.17 J/m² |
| 30 BTU/ft² | 340,695.8 J/m² |
| 40 BTU/ft² | 454,261.07 J/m² |
| 50 BTU/ft² | 567,826.33 J/m² |
| 75 BTU/ft² | 851,739.5 J/m² |
| 100 BTU/ft² | 1,135,652.7 J/m² |
| 250 BTU/ft² | 2,839,131.7 J/m² |
| 500 BTU/ft² | 5,678,263.3 J/m² |
| 1,000 BTU/ft² | 11,356,527 J/m² |
About the units
BTU per square foot (BTU/ft²)
The BTU per square foot (BTU/ft²) is a unit of heat density in the US customary system. One BTU per square foot equals 11,356.52668 joules per square meter (J/m²).
Joule per square meter (J/m²)
The joule per square meter (J/m²) is a unit of heat density in the International System of Units (SI).
Frequently asked questions
How many joules per square meter are in one BTU per square foot?
There are 11,356.52668 joules per square meter in one BTU per square foot, and this value is exact by definition.
How do I convert BTU per square foot to joules per square meter?
Multiply the number of BTU per square foot by 11,356.52668. For example, 10 BTU/ft² × 11,356.52668 = 113,565.2668 J/m².
How many BTU per square foot are in one joule per square meter?
One joule per square meter equals 0.00008805509184 BTU per square foot. That is the reverse factor, 1 ÷ 11,356.52668.
What is 10 BTU per square foot in joules per square meter?
10 BTU/ft² = 113,565.2668 J/m².
Is this BTU/ft² to J/m² converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.