British thermal units to Joules
Type a value in British thermal units and get the result in Joules, calculated exactly.
100 British thermal units = 105,505.585262 Joules
Precision
Exact factorThis result is exact.
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Formula
J = BTU × 1,055.05585262
To convert British thermal units to Joules, multiply the value by 1,055.05585262.
Worked examples
- 1 BTU × 1,055.05585262 = 1,055.05585262 J
- 100 BTU × 1,055.05585262 = 105,505.585262 J
- 50 BTU × 1,055.05585262 = 52,752.792631 J
This factor is exact by definition.
Conversion table
| British thermal units (BTU) | Joules (J) |
|---|---|
| 1 | 1,055.05585262 |
| 2 | 2,110.11170524 |
| 3 | 3,165.16755786 |
| 4 | 4,220.22341048 |
| 5 | 5,275.2792631 |
| 6 | 6,330.33511572 |
| 7 | 7,385.39096834 |
| 8 | 8,440.44682096 |
| 9 | 9,495.50267358 |
| 10 | 10,550.5585262 |
| 15 | 15,825.8377893 |
| 20 | 21,101.1170524 |
| 25 | 26,376.3963155 |
| 30 | 31,651.6755786 |
| 40 | 42,202.2341048 |
| 50 | 52,752.792631 |
| 60 | 63,303.3511572 |
| 70 | 73,853.9096834 |
| 75 | 79,129.1889465 |
| 80 | 84,404.4682096 |
| 90 | 94,955.0267358 |
| 100 | 105,505.585262 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Joules to British thermal units
| Joules (J) | British thermal units (BTU) |
|---|---|
| 1 | ≈ 0.0009478171 |
| 2 | ≈ 0.001895634 |
| 3 | ≈ 0.002843451 |
| 4 | ≈ 0.003791268 |
| 5 | ≈ 0.004739086 |
| 6 | ≈ 0.005686903 |
| 7 | ≈ 0.00663472 |
| 8 | ≈ 0.007582537 |
| 9 | ≈ 0.008530354 |
| 10 | ≈ 0.009478171 |
| 15 | ≈ 0.01421726 |
| 20 | ≈ 0.01895634 |
| 25 | ≈ 0.02369543 |
| 30 | ≈ 0.02843451 |
| 40 | ≈ 0.03791268 |
| 50 | ≈ 0.04739086 |
| 60 | ≈ 0.05686903 |
| 70 | ≈ 0.0663472 |
| 75 | ≈ 0.07108628 |
| 80 | ≈ 0.07582537 |
| 90 | ≈ 0.08530354 |
| 100 | ≈ 0.09478171 |
Unit definitions
- British thermal units BTU
- The International Table BTU: exactly 1055.05585262 joules.
- Joules J
- The SI unit of energy: one newton acting over one metre, or one watt for one second.
Questions people ask
British thermal units to Joules: what is the conversion factor?
One BTU is 1,055.05585262 J.
How do I convert British thermal units to Joules?
Use the formula above. For example, 100 BTU = 105,505.585262 J.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.