Standby draw

kWh = watts × hours / 1000. A year is 8760 hours. Cost is that times the unit price. A television that sleeps at 0.5 W is not an 8 W soundbar.

Draw when “off”

Hours in the period

Price per kWh

Cost

63 zł

Energy

70.1 kWh

Eight watts for a year is about 70 kWh — a small fridge, not rounding error.

Recent on this tool

This list is the copy in this browser. Click a result to reopen those fields. The server copy sits behind the site owner's PIN.

No results yet. Use a calculator — the first reading appears here.

An educational estimate. Not medical, tax or credit advice.

Kilowatt-hours and the bill for a device from watts and hours a day.

Kilowatt-hours and money saved by swapping a bulb.

A year’s space-heat demand from floor area and a rough insulation class, then electricity at a chosen SCOP versus gas.

A first-pass air-con size from floor area and watts per square metre.

The same yearly heat in gas, pellet, coal, wood, oil, resistance heat and a heat pump.

Heat and electricity to raise daily litres by a temperature difference, then a running cost.