Electricity Cost Calculator
See how much any appliance costs to run — per day, month and year — from its wattage and your electricity price.
Your numbers
Cost per month
$31
kWh per month
180 kWh
Cost per day
$1
Cost per year
$372
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Smart plugs and thermostats cut the cost of always-on appliances.
See devicesThis electricity calculator turns an appliance's power (in watts), how long you use it and your price per kilowatt-hour into a running cost per day, month and year. It's the quickest way to spot which devices quietly drive your electricity bill.
The maths is simple and exact: watts ÷ 1,000 × hours gives kilowatt-hours, and kWh × your rate gives the cost. The surprises come from things left on all day — heaters, old fridges, AC — where small hourly costs add up fast.
- Find an appliance's wattage on its label or in the manual; for heating and cooling it's usually the biggest number in your home.
- Your price per kWh is on your electricity bill — it varies a lot by country and provider.
- Always-on and heating/cooling devices dominate bills; switching providers or tariffs can cut the rate itself.
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How do I calculate the cost of running an appliance?
Multiply the power in watts by hours used and divide by 1,000 to get kilowatt-hours (kWh), then multiply by your price per kWh. This calculator does it for a day, month and year automatically.
Where do I find an appliance's wattage?
On the rating label (often on the back or base) or in the manual. If only volts and amps are listed, multiply them to get watts.
What uses the most electricity at home?
Heating, cooling and anything that runs constantly — electric heaters, air conditioning, water heaters and older fridges — typically account for the largest share of a bill.
CostTrek provides general information, not financial advice. Results are estimates based on the figures you enter; your actual rate, taxes and insurance will vary. Confirm details with a qualified lender or advisor.