h/day

$

$

Item - optional

Power Consumption

Usage time

h/day

Calculate the electric cost of an item, by adding item power consumption, usage time per day, and the tariff per KWh (means one Kilowatt-hour "KWh" cost).

Formulas:

Converting watts and kilowatts

Kilowatts to Watts formula:

Watts (W) = KW x 1000

1 KW = 1 x 1000 = 1000 Watts (W)Watts to Kilowatts formula:

Kilowatts (KW) = W ÷ 1000

100 W = 100 ÷ 1000 = 0.1 Kilowatts (KW)KWh consumption formula:

KWh consumption (energy) = Power x Time

Example:

Power = 2 KW

Time = 3 hours

kWh = 2 x 3 = 6 KWhKWh Cost formula:

Cost = KWh used x Tariff per KWh

Example:

Power = 2 KW

Time = 3 hours

So the kWh = 2 x 3 = 6 KWh

Tariff = $0.10 per KWh

Cost = 6 KWh x $0.10/KWh = $0.60