BTU to Joules Converter
1 BTU = 1,055.06 J. Multiply BTUs by 1,055.06 to get joules. A 10,000 BTU AC unit = 10.55 MJ/hour.
Formula
Formula
J = BTU × 1,055.06
Worked example
To convert 500 BTU to joules: 500 × 1,055.06 = 527,528 J (≈ 527.5 kJ).
Quick reference table
| BTU | J |
|---|---|
| 1 | 1055.055853 |
| 10 | 10550.558526 |
| 100 | 105505.585262 |
| 500 | 527527.92631 |
| 1000 | 1055055.85262 |
| 5000 | 5275279.2631 |
| 10000 | 10550558.5262 |
| 50000 | 52752792.631 |
| 100000 | 105505585.262 |
Unit definitions
BTU (BTU)
A BTU (British Thermal Unit) is the heat required to raise the temperature of 1 pound of water by 1°F. Used in HVAC, boilers, and US energy ratings.
Joule (J)
The joule (J) is the SI unit of energy. 1 BTU = 1,055.05585 J (IT definition).
Common use cases
- HVAC load calculations
- Boiler and furnace ratings
- Air conditioner capacity
- Converting US energy data to SI