Electricity cost calculator
See exactly what a heater, fridge, PC or AC adds to your bill.
Electricity Cost Calculator
Cost per month$38.25
Cost per day$1.28
Cost per year$465.38
kWh per day7.5
How it works
- kWh per day = watts × hours used ÷ 1,000.
- Cost = kWh × your rate per kWh (on your bill; the US average is about $0.17).
- Monthly = daily × 30, yearly = daily × 365.
Example: A 1,500 W space heater run 5 hours a day at $0.17/kWh costs $1.28 a day — about $38 a month.
Frequently asked questions
Where do I find an appliance's wattage?
On the rating label or in the manual. A plug-in energy meter gives the true figure.
What is a kWh?
One kilowatt-hour: 1,000 watts used for one hour. It's the unit your bill charges for.
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