Work out standby power waste instantly with clear inputs, formula shown and shareable results.
Standby power looks trivial per device but accumulates: twelve devices at 2.5 W for twenty hours a day is 219 kWh a year. Modern regulations cap standby at 0.5 W for most products, but set-top boxes, games consoles and older equipment remain well above that.
Standby waste
annual kWh = devices x standby watts x hours x 365 / 1000
Set-top boxes and games consoles in rest mode can draw 10-20 W. Chargers and modern televisions are usually under 1 W.
For high-standby devices yes. For a phone charger drawing 0.1 W it saves about 25 pence a year, which is not worth the inconvenience.