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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 Joule is 1 Newton Metre, ie the work done or energy transfered to an object when a one Newton force acts on it over one metre. It can also be defined as the heat energy dissipated by a current of one ampere passing through a one Ohm resistor for one second
| Btu (mean) | Joules |
|---|---|
| 0Btu (mean) | 0.00J |
| 1Btu (mean) | 1055.87J |
| 2Btu (mean) | 2111.74J |
| 3Btu (mean) | 3167.61J |
| 4Btu (mean) | 4223.48J |
| 5Btu (mean) | 5279.35J |
| 6Btu (mean) | 6335.22J |
| 7Btu (mean) | 7391.09J |
| 8Btu (mean) | 8446.96J |
| 9Btu (mean) | 9502.83J |
| 10Btu (mean) | 10558.70J |
| 11Btu (mean) | 11614.57J |
| 12Btu (mean) | 12670.44J |
| 13Btu (mean) | 13726.31J |
| 14Btu (mean) | 14782.18J |
| 15Btu (mean) | 15838.05J |
| 16Btu (mean) | 16893.92J |
| 17Btu (mean) | 17949.79J |
| 18Btu (mean) | 19005.66J |
| 19Btu (mean) | 20061.53J |
| Btu (mean) | Joules |
|---|---|
| 20Btu (mean) | 21117.40J |
| 21Btu (mean) | 22173.27J |
| 22Btu (mean) | 23229.14J |
| 23Btu (mean) | 24285.01J |
| 24Btu (mean) | 25340.88J |
| 25Btu (mean) | 26396.75J |
| 26Btu (mean) | 27452.62J |
| 27Btu (mean) | 28508.49J |
| 28Btu (mean) | 29564.36J |
| 29Btu (mean) | 30620.23J |
| 30Btu (mean) | 31676.10J |
| 31Btu (mean) | 32731.97J |
| 32Btu (mean) | 33787.84J |
| 33Btu (mean) | 34843.71J |
| 34Btu (mean) | 35899.58J |
| 35Btu (mean) | 36955.45J |
| 36Btu (mean) | 38011.32J |
| 37Btu (mean) | 39067.19J |
| 38Btu (mean) | 40123.06J |
| 39Btu (mean) | 41178.93J |
| Btu (mean) | Joules |
|---|---|
| 40Btu (mean) | 42234.80J |
| 41Btu (mean) | 43290.67J |
| 42Btu (mean) | 44346.54J |
| 43Btu (mean) | 45402.41J |
| 44Btu (mean) | 46458.28J |
| 45Btu (mean) | 47514.15J |
| 46Btu (mean) | 48570.02J |
| 47Btu (mean) | 49625.89J |
| 48Btu (mean) | 50681.76J |
| 49Btu (mean) | 51737.63J |
| 50Btu (mean) | 52793.50J |
| 51Btu (mean) | 53849.37J |
| 52Btu (mean) | 54905.24J |
| 53Btu (mean) | 55961.11J |
| 54Btu (mean) | 57016.98J |
| 55Btu (mean) | 58072.85J |
| 56Btu (mean) | 59128.72J |
| 57Btu (mean) | 60184.59J |
| 58Btu (mean) | 61240.46J |
| 59Btu (mean) | 62296.33J |