A 1,500 W heater, 3 hours a day, 0.20 per kWh
4.5 kWh a day: 0.90 a day, 27.38 a month and 328.50 a year.
Electricity Cost Calculator
Find what an appliance costs to run per day, month and year from its wattage and your electricity price.
Result
Enter your values and select Calculate to see the result.
Runs in your browser — nothing you enter is sent to a server.
How the Electricity Cost Calculator works
Enter the appliance's power in watts, how many hours a day it runs and your electricity price per kWh (on your bill). The calculator converts watts to kilowatts, multiplies by the hours to get the energy in kilowatt-hours, and multiplies that by your price. A month is an average of 365 ÷ 12 days.
Formula
kWh = W ÷ 1000 × hours; cost = kWh × price
Examples
Six 10 W LED bulbs, 5 hours a day, 0.30 per kWh
0.3 kWh a day: 32.85 a year.
Frequently asked questions
Is the label wattage what the appliance really uses?
It's the maximum. Fridges, heaters and air conditioners cycle on and off, so their real use is lower. A plug-in energy meter gives exact numbers.
What does standby cost?
Enter the standby watts and 24 hours: a 2 W standby at 0.20 per kWh costs about 3.50 a year.
What's the difference between kW and kWh?
kW is power — how fast energy is used. kWh is energy — power × time. The Energy Converter converts kWh to other units.
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