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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 thermochemical calorie was defined in 1930 by Frederick Rossini as 4.1833 joules. With the change to absolute electrical units in 1948, the thermochemical calorie was redefined to 4.184 joules, to keep the same quantity of energy represented by it
| Btu (mean) | Calories (thermoc.) |
|---|---|
| 0Btu (mean) | 0.00Calorie (thermoc.) |
| 1Btu (mean) | 252.36Calorie (thermoc.) |
| 2Btu (mean) | 504.72Calorie (thermoc.) |
| 3Btu (mean) | 757.08Calorie (thermoc.) |
| 4Btu (mean) | 1009.44Calorie (thermoc.) |
| 5Btu (mean) | 1261.79Calorie (thermoc.) |
| 6Btu (mean) | 1514.15Calorie (thermoc.) |
| 7Btu (mean) | 1766.51Calorie (thermoc.) |
| 8Btu (mean) | 2018.87Calorie (thermoc.) |
| 9Btu (mean) | 2271.23Calorie (thermoc.) |
| 10Btu (mean) | 2523.59Calorie (thermoc.) |
| 11Btu (mean) | 2775.95Calorie (thermoc.) |
| 12Btu (mean) | 3028.31Calorie (thermoc.) |
| 13Btu (mean) | 3280.67Calorie (thermoc.) |
| 14Btu (mean) | 3533.03Calorie (thermoc.) |
| 15Btu (mean) | 3785.38Calorie (thermoc.) |
| 16Btu (mean) | 4037.74Calorie (thermoc.) |
| 17Btu (mean) | 4290.10Calorie (thermoc.) |
| 18Btu (mean) | 4542.46Calorie (thermoc.) |
| 19Btu (mean) | 4794.82Calorie (thermoc.) |
| Btu (mean) | Calories (thermoc.) |
|---|---|
| 20Btu (mean) | 5047.18Calorie (thermoc.) |
| 21Btu (mean) | 5299.54Calorie (thermoc.) |
| 22Btu (mean) | 5551.90Calorie (thermoc.) |
| 23Btu (mean) | 5804.26Calorie (thermoc.) |
| 24Btu (mean) | 6056.62Calorie (thermoc.) |
| 25Btu (mean) | 6308.97Calorie (thermoc.) |
| 26Btu (mean) | 6561.33Calorie (thermoc.) |
| 27Btu (mean) | 6813.69Calorie (thermoc.) |
| 28Btu (mean) | 7066.05Calorie (thermoc.) |
| 29Btu (mean) | 7318.41Calorie (thermoc.) |
| 30Btu (mean) | 7570.77Calorie (thermoc.) |
| 31Btu (mean) | 7823.13Calorie (thermoc.) |
| 32Btu (mean) | 8075.49Calorie (thermoc.) |
| 33Btu (mean) | 8327.85Calorie (thermoc.) |
| 34Btu (mean) | 8580.21Calorie (thermoc.) |
| 35Btu (mean) | 8832.56Calorie (thermoc.) |
| 36Btu (mean) | 9084.92Calorie (thermoc.) |
| 37Btu (mean) | 9337.28Calorie (thermoc.) |
| 38Btu (mean) | 9589.64Calorie (thermoc.) |
| 39Btu (mean) | 9842.00Calorie (thermoc.) |
| Btu (mean) | Calories (thermoc.) |
|---|---|
| 40Btu (mean) | 10094.36Calorie (thermoc.) |
| 41Btu (mean) | 10346.72Calorie (thermoc.) |
| 42Btu (mean) | 10599.08Calorie (thermoc.) |
| 43Btu (mean) | 10851.44Calorie (thermoc.) |
| 44Btu (mean) | 11103.80Calorie (thermoc.) |
| 45Btu (mean) | 11356.15Calorie (thermoc.) |
| 46Btu (mean) | 11608.51Calorie (thermoc.) |
| 47Btu (mean) | 11860.87Calorie (thermoc.) |
| 48Btu (mean) | 12113.23Calorie (thermoc.) |
| 49Btu (mean) | 12365.59Calorie (thermoc.) |
| 50Btu (mean) | 12617.95Calorie (thermoc.) |
| 51Btu (mean) | 12870.31Calorie (thermoc.) |
| 52Btu (mean) | 13122.67Calorie (thermoc.) |
| 53Btu (mean) | 13375.03Calorie (thermoc.) |
| 54Btu (mean) | 13627.39Calorie (thermoc.) |
| 55Btu (mean) | 13879.74Calorie (thermoc.) |
| 56Btu (mean) | 14132.10Calorie (thermoc.) |
| 57Btu (mean) | 14384.46Calorie (thermoc.) |
| 58Btu (mean) | 14636.82Calorie (thermoc.) |
| 59Btu (mean) | 14889.18Calorie (thermoc.) |