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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
One Calorie (20°C) is the amount of energy needed to raise the temperature of 1 gram of air-free water from 19.5 to 20.5 °C at atmospheric pressure.
| Btu (mean) | Calories (20°C) |
|---|---|
| 0Btu (mean) | 0.00cal20 |
| 1Btu (mean) | 252.49cal20 |
| 2Btu (mean) | 504.97cal20 |
| 3Btu (mean) | 757.46cal20 |
| 4Btu (mean) | 1009.94cal20 |
| 5Btu (mean) | 1262.43cal20 |
| 6Btu (mean) | 1514.91cal20 |
| 7Btu (mean) | 1767.40cal20 |
| 8Btu (mean) | 2019.89cal20 |
| 9Btu (mean) | 2272.37cal20 |
| 10Btu (mean) | 2524.86cal20 |
| 11Btu (mean) | 2777.34cal20 |
| 12Btu (mean) | 3029.83cal20 |
| 13Btu (mean) | 3282.31cal20 |
| 14Btu (mean) | 3534.80cal20 |
| 15Btu (mean) | 3787.29cal20 |
| 16Btu (mean) | 4039.77cal20 |
| 17Btu (mean) | 4292.26cal20 |
| 18Btu (mean) | 4544.74cal20 |
| 19Btu (mean) | 4797.23cal20 |
| Btu (mean) | Calories (20°C) |
|---|---|
| 20Btu (mean) | 5049.71cal20 |
| 21Btu (mean) | 5302.20cal20 |
| 22Btu (mean) | 5554.69cal20 |
| 23Btu (mean) | 5807.17cal20 |
| 24Btu (mean) | 6059.66cal20 |
| 25Btu (mean) | 6312.14cal20 |
| 26Btu (mean) | 6564.63cal20 |
| 27Btu (mean) | 6817.11cal20 |
| 28Btu (mean) | 7069.60cal20 |
| 29Btu (mean) | 7322.09cal20 |
| 30Btu (mean) | 7574.57cal20 |
| 31Btu (mean) | 7827.06cal20 |
| 32Btu (mean) | 8079.54cal20 |
| 33Btu (mean) | 8332.03cal20 |
| 34Btu (mean) | 8584.51cal20 |
| 35Btu (mean) | 8837.00cal20 |
| 36Btu (mean) | 9089.49cal20 |
| 37Btu (mean) | 9341.97cal20 |
| 38Btu (mean) | 9594.46cal20 |
| 39Btu (mean) | 9846.94cal20 |
| Btu (mean) | Calories (20°C) |
|---|---|
| 40Btu (mean) | 10099.43cal20 |
| 41Btu (mean) | 10351.91cal20 |
| 42Btu (mean) | 10604.40cal20 |
| 43Btu (mean) | 10856.89cal20 |
| 44Btu (mean) | 11109.37cal20 |
| 45Btu (mean) | 11361.86cal20 |
| 46Btu (mean) | 11614.34cal20 |
| 47Btu (mean) | 11866.83cal20 |
| 48Btu (mean) | 12119.31cal20 |
| 49Btu (mean) | 12371.80cal20 |
| 50Btu (mean) | 12624.29cal20 |
| 51Btu (mean) | 12876.77cal20 |
| 52Btu (mean) | 13129.26cal20 |
| 53Btu (mean) | 13381.74cal20 |
| 54Btu (mean) | 13634.23cal20 |
| 55Btu (mean) | 13886.71cal20 |
| 56Btu (mean) | 14139.20cal20 |
| 57Btu (mean) | 14391.69cal20 |
| 58Btu (mean) | 14644.17cal20 |
| 59Btu (mean) | 14896.66cal20 |