Convert Watt-Hours to Terajoules
Convert Watt-Hours (Wh) to Terajoules (TJ) instantly and accurately.
Conversion Formula
TJ = Wh × 3.600000000e-9
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 Terajoules
A terajoule (TJ) is 10¹² J - the scale of nuclear yields in the kiloton range and large industrial accidents. One kiloton of TNT = 4.184 TJ; the Hiroshima bomb (15 kt) released ~62.8 TJ. The Halifax Explosion (1917) released ~3 TJ. A 500 MW coal plant consumes ~51.4 TJ/h of thermal input. Daily primary energy of Denmark is ~250-300 TJ; the UK ~3,800 TJ/day. A 1 GW nuclear reactor at 90% capacity factor generates ~77.7 TJ/day. 1 TJ = 10¹² J = 277,778 kWh = 277.78 MWh = 23.88 ktoe.
Quick Reference Table
| Watt-Hours (Wh) | Terajoules (TJ) |
|---|---|
| 1 Wh | 3.6 × 10-9 TJ |
| 2 Wh | 7.2 × 10-9 TJ |
| 5 Wh | 1.8 × 10-8 TJ |
| 10 Wh | 3.6 × 10-8 TJ |
| 25 Wh | 9 × 10-8 TJ |
| 50 Wh | 1.8 × 10-7 TJ |
| 100 Wh | 3.6 × 10-7 TJ |