能量是执行工作的能力。它以各种形式存在，例如动力学，电势，热等。在焦耳（J）中测量。
1 BTU = 252.165 th cal
1 th cal = 0.004 BTU
例子:
将15 英国热单元转换为热化学卡路里：
15 BTU = 3,782.481 th cal
| 英国热单元 | 热化学卡路里 |
|---|---|
| 0.01 BTU | 2.522 th cal |
| 0.1 BTU | 25.217 th cal |
| 1 BTU | 252.165 th cal |
| 2 BTU | 504.331 th cal |
| 3 BTU | 756.496 th cal |
| 5 BTU | 1,260.827 th cal |
| 10 BTU | 2,521.654 th cal |
| 20 BTU | 5,043.308 th cal |
| 30 BTU | 7,564.962 th cal |
| 40 BTU | 10,086.616 th cal |
| 50 BTU | 12,608.27 th cal |
| 60 BTU | 15,129.924 th cal |
| 70 BTU | 17,651.577 th cal |
| 80 BTU | 20,173.231 th cal |
| 90 BTU | 22,694.885 th cal |
| 100 BTU | 25,216.539 th cal |
| 250 BTU | 63,041.348 th cal |
| 500 BTU | 126,082.696 th cal |
| 750 BTU | 189,124.044 th cal |
| 1000 BTU | 252,165.392 th cal |
| 10000 BTU | 2,521,653.92 th cal |
| 100000 BTU | 25,216,539.197 th cal |
规则