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One BTU is the energy required to heat 1 avoirdupois pound of liquid water by 1 degree Fahrenheit, at a pressure of one atmosphere. The Btu (mean) uses a result averaged over water temperatures 0 to 100 °C (32.0 to 212.0 °F) which is approx. 1055.87 J
The International Committee for Weights and Measures have defined one cal15 is the ammount of heat energy needed to raise the temperature of 1g of water from 14.5°C to 15.5°C
| Btu (mean) | Calories (15°C,CIPM, 1950) |
|---|---|
| 0Btu (mean) | 0.00cal15 |
| 1Btu (mean) | 252.27cal15 |
| 2Btu (mean) | 504.54cal15 |
| 3Btu (mean) | 756.81cal15 |
| 4Btu (mean) | 1009.07cal15 |
| 5Btu (mean) | 1261.34cal15 |
| 6Btu (mean) | 1513.61cal15 |
| 7Btu (mean) | 1765.88cal15 |
| 8Btu (mean) | 2018.15cal15 |
| 9Btu (mean) | 2270.42cal15 |
| 10Btu (mean) | 2522.69cal15 |
| 11Btu (mean) | 2774.95cal15 |
| 12Btu (mean) | 3027.22cal15 |
| 13Btu (mean) | 3279.49cal15 |
| 14Btu (mean) | 3531.76cal15 |
| 15Btu (mean) | 3784.03cal15 |
| 16Btu (mean) | 4036.30cal15 |
| 17Btu (mean) | 4288.57cal15 |
| 18Btu (mean) | 4540.83cal15 |
| 19Btu (mean) | 4793.10cal15 |
| Btu (mean) | Calories (15°C,CIPM, 1950) |
|---|---|
| 20Btu (mean) | 5045.37cal15 |
| 21Btu (mean) | 5297.64cal15 |
| 22Btu (mean) | 5549.91cal15 |
| 23Btu (mean) | 5802.18cal15 |
| 24Btu (mean) | 6054.45cal15 |
| 25Btu (mean) | 6306.71cal15 |
| 26Btu (mean) | 6558.98cal15 |
| 27Btu (mean) | 6811.25cal15 |
| 28Btu (mean) | 7063.52cal15 |
| 29Btu (mean) | 7315.79cal15 |
| 30Btu (mean) | 7568.06cal15 |
| 31Btu (mean) | 7820.32cal15 |
| 32Btu (mean) | 8072.59cal15 |
| 33Btu (mean) | 8324.86cal15 |
| 34Btu (mean) | 8577.13cal15 |
| 35Btu (mean) | 8829.40cal15 |
| 36Btu (mean) | 9081.67cal15 |
| 37Btu (mean) | 9333.94cal15 |
| 38Btu (mean) | 9586.20cal15 |
| 39Btu (mean) | 9838.47cal15 |
| Btu (mean) | Calories (15°C,CIPM, 1950) |
|---|---|
| 40Btu (mean) | 10090.74cal15 |
| 41Btu (mean) | 10343.01cal15 |
| 42Btu (mean) | 10595.28cal15 |
| 43Btu (mean) | 10847.55cal15 |
| 44Btu (mean) | 11099.82cal15 |
| 45Btu (mean) | 11352.08cal15 |
| 46Btu (mean) | 11604.35cal15 |
| 47Btu (mean) | 11856.62cal15 |
| 48Btu (mean) | 12108.89cal15 |
| 49Btu (mean) | 12361.16cal15 |
| 50Btu (mean) | 12613.43cal15 |
| 51Btu (mean) | 12865.70cal15 |
| 52Btu (mean) | 13117.96cal15 |
| 53Btu (mean) | 13370.23cal15 |
| 54Btu (mean) | 13622.50cal15 |
| 55Btu (mean) | 13874.77cal15 |
| 56Btu (mean) | 14127.04cal15 |
| 57Btu (mean) | 14379.31cal15 |
| 58Btu (mean) | 14631.58cal15 |
| 59Btu (mean) | 14883.84cal15 |