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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 5th International Conference on the Properties of Steam defined the International Table calorie as 4.1868 J
| Btu (mean) | Calories (I.T.) |
|---|---|
| 0Btu (mean) | 0.00calIT |
| 1Btu (mean) | 252.19calIT |
| 2Btu (mean) | 504.38calIT |
| 3Btu (mean) | 756.57calIT |
| 4Btu (mean) | 1008.76calIT |
| 5Btu (mean) | 1260.95calIT |
| 6Btu (mean) | 1513.14calIT |
| 7Btu (mean) | 1765.33calIT |
| 8Btu (mean) | 2017.52calIT |
| 9Btu (mean) | 2269.71calIT |
| 10Btu (mean) | 2521.90calIT |
| 11Btu (mean) | 2774.09calIT |
| 12Btu (mean) | 3026.28calIT |
| 13Btu (mean) | 3278.47calIT |
| 14Btu (mean) | 3530.66calIT |
| 15Btu (mean) | 3782.85calIT |
| 16Btu (mean) | 4035.04calIT |
| 17Btu (mean) | 4287.23calIT |
| 18Btu (mean) | 4539.42calIT |
| 19Btu (mean) | 4791.61calIT |
| Btu (mean) | Calories (I.T.) |
|---|---|
| 20Btu (mean) | 5043.80calIT |
| 21Btu (mean) | 5295.99calIT |
| 22Btu (mean) | 5548.18calIT |
| 23Btu (mean) | 5800.38calIT |
| 24Btu (mean) | 6052.57calIT |
| 25Btu (mean) | 6304.76calIT |
| 26Btu (mean) | 6556.95calIT |
| 27Btu (mean) | 6809.14calIT |
| 28Btu (mean) | 7061.33calIT |
| 29Btu (mean) | 7313.52calIT |
| 30Btu (mean) | 7565.71calIT |
| 31Btu (mean) | 7817.90calIT |
| 32Btu (mean) | 8070.09calIT |
| 33Btu (mean) | 8322.28calIT |
| 34Btu (mean) | 8574.47calIT |
| 35Btu (mean) | 8826.66calIT |
| 36Btu (mean) | 9078.85calIT |
| 37Btu (mean) | 9331.04calIT |
| 38Btu (mean) | 9583.23calIT |
| 39Btu (mean) | 9835.42calIT |
| Btu (mean) | Calories (I.T.) |
|---|---|
| 40Btu (mean) | 10087.61calIT |
| 41Btu (mean) | 10339.80calIT |
| 42Btu (mean) | 10591.99calIT |
| 43Btu (mean) | 10844.18calIT |
| 44Btu (mean) | 11096.37calIT |
| 45Btu (mean) | 11348.56calIT |
| 46Btu (mean) | 11600.75calIT |
| 47Btu (mean) | 11852.94calIT |
| 48Btu (mean) | 12105.13calIT |
| 49Btu (mean) | 12357.32calIT |
| 50Btu (mean) | 12609.51calIT |
| 51Btu (mean) | 12861.70calIT |
| 52Btu (mean) | 13113.89calIT |
| 53Btu (mean) | 13366.08calIT |
| 54Btu (mean) | 13618.27calIT |
| 55Btu (mean) | 13870.46calIT |
| 56Btu (mean) | 14122.65calIT |
| 57Btu (mean) | 14374.84calIT |
| 58Btu (mean) | 14627.03calIT |
| 59Btu (mean) | 14879.22calIT |