Convert Exajoules to Calories
Convert Exajoules (EJ) to Calories (cal) instantly and accurately.
Conversion Formula
cal = EJ × 2.390057361e+17
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.
About Calories
A calorie (cal) - the thermochemical calorie - is exactly 4.184 J, defined as the heat to raise 1 g of water by 1°C. Standard since 1954. The calorie is the fundamental unit of heat measurement in thermochemistry: glucose combustion releases 669.9 kcal/mol; water vaporisation requires 539.7 cal/g. Bond dissociation energies in quantum chemistry are often quoted in kcal/mol. Note: the dietary Calorie (capital C) on food labels is 1 kcal = 4,184 J - a factor-of-1,000 difference that causes persistent confusion. 1 cal = 4.184 J = 1.163 × 10⁻³ Wh.
Quick Reference Table
| Exajoules (EJ) | Calories (cal) |
|---|---|
| 1 EJ | 2.39 × 1017 cal |
| 2 EJ | 4.78 × 1017 cal |
| 5 EJ | 1.195 × 1018 cal |
| 10 EJ | 2.39 × 1018 cal |
| 25 EJ | 5.975 × 1018 cal |
| 50 EJ | 1.195 × 1019 cal |
| 100 EJ | 2.39 × 1019 cal |