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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
One BTU is defined as the energy required at 1 atmosphere to heat 1 avoirdupois pound of liquid water by 1 degree Fahrenheit. One Btu (15.8°C, ISO) equates to 1,054.5 J
| Calories (thermoc.) | Btu (15.8°C, ISO) |
|---|---|
| 0Calorie (thermoc.) | 0.00Btu (15.8°C, ISO) |
| 1Calorie (thermoc.) | 0.00Btu (15.8°C, ISO) |
| 2Calorie (thermoc.) | 0.01Btu (15.8°C, ISO) |
| 3Calorie (thermoc.) | 0.01Btu (15.8°C, ISO) |
| 4Calorie (thermoc.) | 0.02Btu (15.8°C, ISO) |
| 5Calorie (thermoc.) | 0.02Btu (15.8°C, ISO) |
| 6Calorie (thermoc.) | 0.02Btu (15.8°C, ISO) |
| 7Calorie (thermoc.) | 0.03Btu (15.8°C, ISO) |
| 8Calorie (thermoc.) | 0.03Btu (15.8°C, ISO) |
| 9Calorie (thermoc.) | 0.04Btu (15.8°C, ISO) |
| 10Calorie (thermoc.) | 0.04Btu (15.8°C, ISO) |
| 11Calorie (thermoc.) | 0.04Btu (15.8°C, ISO) |
| 12Calorie (thermoc.) | 0.05Btu (15.8°C, ISO) |
| 13Calorie (thermoc.) | 0.05Btu (15.8°C, ISO) |
| 14Calorie (thermoc.) | 0.06Btu (15.8°C, ISO) |
| 15Calorie (thermoc.) | 0.06Btu (15.8°C, ISO) |
| 16Calorie (thermoc.) | 0.06Btu (15.8°C, ISO) |
| 17Calorie (thermoc.) | 0.07Btu (15.8°C, ISO) |
| 18Calorie (thermoc.) | 0.07Btu (15.8°C, ISO) |
| 19Calorie (thermoc.) | 0.08Btu (15.8°C, ISO) |
| Calories (thermoc.) | Btu (15.8°C, ISO) |
|---|---|
| 20Calorie (thermoc.) | 0.08Btu (15.8°C, ISO) |
| 21Calorie (thermoc.) | 0.08Btu (15.8°C, ISO) |
| 22Calorie (thermoc.) | 0.09Btu (15.8°C, ISO) |
| 23Calorie (thermoc.) | 0.09Btu (15.8°C, ISO) |
| 24Calorie (thermoc.) | 0.10Btu (15.8°C, ISO) |
| 25Calorie (thermoc.) | 0.10Btu (15.8°C, ISO) |
| 26Calorie (thermoc.) | 0.10Btu (15.8°C, ISO) |
| 27Calorie (thermoc.) | 0.11Btu (15.8°C, ISO) |
| 28Calorie (thermoc.) | 0.11Btu (15.8°C, ISO) |
| 29Calorie (thermoc.) | 0.12Btu (15.8°C, ISO) |
| 30Calorie (thermoc.) | 0.12Btu (15.8°C, ISO) |
| 31Calorie (thermoc.) | 0.12Btu (15.8°C, ISO) |
| 32Calorie (thermoc.) | 0.13Btu (15.8°C, ISO) |
| 33Calorie (thermoc.) | 0.13Btu (15.8°C, ISO) |
| 34Calorie (thermoc.) | 0.13Btu (15.8°C, ISO) |
| 35Calorie (thermoc.) | 0.14Btu (15.8°C, ISO) |
| 36Calorie (thermoc.) | 0.14Btu (15.8°C, ISO) |
| 37Calorie (thermoc.) | 0.15Btu (15.8°C, ISO) |
| 38Calorie (thermoc.) | 0.15Btu (15.8°C, ISO) |
| 39Calorie (thermoc.) | 0.15Btu (15.8°C, ISO) |
| Calories (thermoc.) | Btu (15.8°C, ISO) |
|---|---|
| 40Calorie (thermoc.) | 0.16Btu (15.8°C, ISO) |
| 41Calorie (thermoc.) | 0.16Btu (15.8°C, ISO) |
| 42Calorie (thermoc.) | 0.17Btu (15.8°C, ISO) |
| 43Calorie (thermoc.) | 0.17Btu (15.8°C, ISO) |
| 44Calorie (thermoc.) | 0.17Btu (15.8°C, ISO) |
| 45Calorie (thermoc.) | 0.18Btu (15.8°C, ISO) |
| 46Calorie (thermoc.) | 0.18Btu (15.8°C, ISO) |
| 47Calorie (thermoc.) | 0.19Btu (15.8°C, ISO) |
| 48Calorie (thermoc.) | 0.19Btu (15.8°C, ISO) |
| 49Calorie (thermoc.) | 0.19Btu (15.8°C, ISO) |
| 50Calorie (thermoc.) | 0.20Btu (15.8°C, ISO) |
| 51Calorie (thermoc.) | 0.20Btu (15.8°C, ISO) |
| 52Calorie (thermoc.) | 0.21Btu (15.8°C, ISO) |
| 53Calorie (thermoc.) | 0.21Btu (15.8°C, ISO) |
| 54Calorie (thermoc.) | 0.21Btu (15.8°C, ISO) |
| 55Calorie (thermoc.) | 0.22Btu (15.8°C, ISO) |
| 56Calorie (thermoc.) | 0.22Btu (15.8°C, ISO) |
| 57Calorie (thermoc.) | 0.23Btu (15.8°C, ISO) |
| 58Calorie (thermoc.) | 0.23Btu (15.8°C, ISO) |
| 59Calorie (thermoc.) | 0.23Btu (15.8°C, ISO) |