Convert British Thermal Units to Exajoules
Convert British Thermal Units (BTU) to Exajoules (EJ) instantly and accurately.
Conversion Formula
EJ = BTU × 1.055055853e-15
About British Thermal Units
A British Thermal Unit (BTU) - the heat to raise 1 lb of water by 1°F - equals exactly 1,055.05585262 J. It dominates US HVAC: room air conditioners are rated in BTU/h (5,000-24,000 BTU/h = 1.5-7.0 kW); one ton of refrigeration is exactly 12,000 BTU/h. Natural gas is billed in therms (100,000 BTU) in the US. Higher heating values: natural gas ~1,020-1,050 BTU/ft³; No. 2 fuel oil ~138,700 BTU/US gal; propane ~91,500 BTU/US gal. 1 BTU = 1,055.06 J = 252.164 cal = 0.29307 Wh.
About Exajoules
An exajoule (EJ) is 10¹⁸ J - the scale of global energy consumption. World primary energy supply in 2022 was ~580-610 EJ: coal ~160 EJ; oil ~190 EJ; gas ~145 EJ; nuclear ~26 EJ; wind ~8 EJ; solar PV ~8 EJ. Global electricity generation of ~29,000 TWh = 104 EJ. Solar energy incident on Earth's atmosphere is ~5.5 × 10⁶ EJ/year - approximately 9,000× total human demand. Annual fossil fuel combustion releases ~490 EJ/year, producing ~36.8 Gt CO₂. 1 EJ = 10¹⁸ J = 277.78 TWh = 238.85 Mtoe.
Quick Reference Table
| British Thermal Units (BTU) | Exajoules (EJ) |
|---|---|
| 1 BTU | 1.055 × 10-15 EJ |
| 2 BTU | 2.11 × 10-15 EJ |
| 5 BTU | 5.275 × 10-15 EJ |
| 10 BTU | 1.055 × 10-14 EJ |
| 25 BTU | 2.638 × 10-14 EJ |
| 50 BTU | 5.275 × 10-14 EJ |
| 100 BTU | 1.055 × 10-13 EJ |