Convert Watt-Hours to Exajoules
Convert Watt-Hours (Wh) to Exajoules (EJ) instantly and accurately.
Conversion Formula
EJ = Wh × 3.600000000e-15
About Watt-Hours
A watt-hour (Wh) is the energy delivered by 1 watt for one hour - exactly 3,600 J. It is the practical unit for small-scale electrical energy: a 10,000 mAh 5 V power bank stores 50 Wh; a laptop battery holds 50-90 Wh; a smartphone battery holds 10-15 Wh; an AA alkaline cell stores ~3 Wh. LED lamps labelled 9 W save 51 Wh/h over a 60 W incandescent. IATA dangerous-goods rules use Wh as the threshold for lithium batteries in aircraft: cells >20 Wh and batteries >100 Wh need special approval. 1 Wh = 3,600 J = 3.412 BTU.
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
| Watt-Hours (Wh) | Exajoules (EJ) |
|---|---|
| 1 Wh | 3.6 × 10-15 EJ |
| 2 Wh | 7.2 × 10-15 EJ |
| 5 Wh | 1.8 × 10-14 EJ |
| 10 Wh | 3.6 × 10-14 EJ |
| 25 Wh | 9 × 10-14 EJ |
| 50 Wh | 1.8 × 10-13 EJ |
| 100 Wh | 3.6 × 10-13 EJ |