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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 BTU is the energy required to warm 1 avoirdupois pound of liquid water by 1 degree Fahrenheit, at one atmosphere. The Btu (3.9°C) uses the calorie value of water at the temperature of its maximum density
| -20.000Btu (mean) | -19.928Btu (3.9°C) |
| -19.000Btu (mean) | -18.932Btu (3.9°C) |
| -18.000Btu (mean) | -17.935Btu (3.9°C) |
| -17.000Btu (mean) | -16.939Btu (3.9°C) |
| -16.000Btu (mean) | -15.943Btu (3.9°C) |
| -15.000Btu (mean) | -14.946Btu (3.9°C) |
| -14.000Btu (mean) | -13.950Btu (3.9°C) |
| -13.000Btu (mean) | -12.953Btu (3.9°C) |
| -12.000Btu (mean) | -11.957Btu (3.9°C) |
| -11.000Btu (mean) | -10.961Btu (3.9°C) |
| -10.000Btu (mean) | -9.9641Btu (3.9°C) |
| -9.0000Btu (mean) | -8.9677Btu (3.9°C) |
| -8.0000Btu (mean) | -7.9713Btu (3.9°C) |
| -7.0000Btu (mean) | -6.9749Btu (3.9°C) |
| -6.0000Btu (mean) | -5.9785Btu (3.9°C) |
| -5.0000Btu (mean) | -4.9821Btu (3.9°C) |
| -4.0000Btu (mean) | -3.9857Btu (3.9°C) |
| -3.0000Btu (mean) | -2.9892Btu (3.9°C) |
| -2.0000Btu (mean) | -1.9928Btu (3.9°C) |
| -1.0000Btu (mean) | -0.99641Btu (3.9°C) |
| Btu (mean) | Btu (3.9°C) |
|---|---|
| 0.0000Btu (mean) | 0.0000Btu (3.9°C) |
| 1.0000Btu (mean) | 0.99641Btu (3.9°C) |
| 2.0000Btu (mean) | 1.9928Btu (3.9°C) |
| 3.0000Btu (mean) | 2.9892Btu (3.9°C) |
| 4.0000Btu (mean) | 3.9857Btu (3.9°C) |
| 5.0000Btu (mean) | 4.9821Btu (3.9°C) |
| 6.0000Btu (mean) | 5.9785Btu (3.9°C) |
| 7.0000Btu (mean) | 6.9749Btu (3.9°C) |
| 8.0000Btu (mean) | 7.9713Btu (3.9°C) |
| 9.0000Btu (mean) | 8.9677Btu (3.9°C) |
| 10.000Btu (mean) | 9.9641Btu (3.9°C) |
| 11.000Btu (mean) | 10.961Btu (3.9°C) |
| 12.000Btu (mean) | 11.957Btu (3.9°C) |
| 13.000Btu (mean) | 12.953Btu (3.9°C) |
| 14.000Btu (mean) | 13.950Btu (3.9°C) |
| 15.000Btu (mean) | 14.946Btu (3.9°C) |
| 16.000Btu (mean) | 15.943Btu (3.9°C) |
| 17.000Btu (mean) | 16.939Btu (3.9°C) |
| 18.000Btu (mean) | 17.935Btu (3.9°C) |
| 19.000Btu (mean) | 18.932Btu (3.9°C) |
| Btu (mean) | Btu (3.9°C) |
|---|---|
| 20.000Btu (mean) | 19.928Btu (3.9°C) |
| 21.000Btu (mean) | 20.925Btu (3.9°C) |
| 22.000Btu (mean) | 21.921Btu (3.9°C) |
| 23.000Btu (mean) | 22.918Btu (3.9°C) |
| 24.000Btu (mean) | 23.914Btu (3.9°C) |
| 25.000Btu (mean) | 24.910Btu (3.9°C) |
| 26.000Btu (mean) | 25.907Btu (3.9°C) |
| 27.000Btu (mean) | 26.903Btu (3.9°C) |
| 28.000Btu (mean) | 27.900Btu (3.9°C) |
| 29.000Btu (mean) | 28.896Btu (3.9°C) |
| 30.000Btu (mean) | 29.892Btu (3.9°C) |
| 31.000Btu (mean) | 30.889Btu (3.9°C) |
| 32.000Btu (mean) | 31.885Btu (3.9°C) |
| 33.000Btu (mean) | 32.882Btu (3.9°C) |
| 34.000Btu (mean) | 33.878Btu (3.9°C) |
| 35.000Btu (mean) | 34.874Btu (3.9°C) |
| 36.000Btu (mean) | 35.871Btu (3.9°C) |
| 37.000Btu (mean) | 36.867Btu (3.9°C) |
| 38.000Btu (mean) | 37.864Btu (3.9°C) |
| 39.000Btu (mean) | 38.860Btu (3.9°C) |
| Btu (mean) | Btu (3.9°C) |
|---|---|
| 40.000Btu (mean) | 39.857Btu (3.9°C) |
| 41.000Btu (mean) | 40.853Btu (3.9°C) |
| 42.000Btu (mean) | 41.849Btu (3.9°C) |
| 43.000Btu (mean) | 42.846Btu (3.9°C) |
| 44.000Btu (mean) | 43.842Btu (3.9°C) |
| 45.000Btu (mean) | 44.839Btu (3.9°C) |
| 46.000Btu (mean) | 45.835Btu (3.9°C) |
| 47.000Btu (mean) | 46.831Btu (3.9°C) |
| 48.000Btu (mean) | 47.828Btu (3.9°C) |
| 49.000Btu (mean) | 48.824Btu (3.9°C) |
| 50.000Btu (mean) | 49.821Btu (3.9°C) |
| 51.000Btu (mean) | 50.817Btu (3.9°C) |
| 52.000Btu (mean) | 51.814Btu (3.9°C) |
| 53.000Btu (mean) | 52.810Btu (3.9°C) |
| 54.000Btu (mean) | 53.806Btu (3.9°C) |
| 55.000Btu (mean) | 54.803Btu (3.9°C) |
| 56.000Btu (mean) | 55.799Btu (3.9°C) |
| 57.000Btu (mean) | 56.796Btu (3.9°C) |
| 58.000Btu (mean) | 57.792Btu (3.9°C) |
| 59.000Btu (mean) | 58.788Btu (3.9°C) |
| 60.000Btu (mean) | 59.785Btu (3.9°C) |
| 61.000Btu (mean) | 60.781Btu (3.9°C) |
| 62.000Btu (mean) | 61.778Btu (3.9°C) |
| 63.000Btu (mean) | 62.774Btu (3.9°C) |
| 64.000Btu (mean) | 63.770Btu (3.9°C) |
| 65.000Btu (mean) | 64.767Btu (3.9°C) |
| 66.000Btu (mean) | 65.763Btu (3.9°C) |
| 67.000Btu (mean) | 66.760Btu (3.9°C) |
| 68.000Btu (mean) | 67.756Btu (3.9°C) |
| 69.000Btu (mean) | 68.753Btu (3.9°C) |
| 70.000Btu (mean) | 69.749Btu (3.9°C) |
| 71.000Btu (mean) | 70.745Btu (3.9°C) |
| 72.000Btu (mean) | 71.742Btu (3.9°C) |
| 73.000Btu (mean) | 72.738Btu (3.9°C) |
| 74.000Btu (mean) | 73.735Btu (3.9°C) |
| 75.000Btu (mean) | 74.731Btu (3.9°C) |
| 76.000Btu (mean) | 75.727Btu (3.9°C) |
| 77.000Btu (mean) | 76.724Btu (3.9°C) |
| 78.000Btu (mean) | 77.720Btu (3.9°C) |
| 79.000Btu (mean) | 78.717Btu (3.9°C) |