Find the electricity cost of running an appliance.
Power is converted from watts to kilowatts, multiplied by hours of use to get units (kWh), then multiplied by your tariff rate.
Units: (Power in watts ÷ 1000) × hours
Cost: Units × rate per unit
What does 'unit' mean on my electricity bill?
One unit means one kilowatt-hour (kWh) — the energy used by a 1000-watt appliance running for one hour.