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Appliance Electricity Cost Calculator

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Turn an appliance’s wattage into money. Enter its power, how long you use it and your electricity price to see the cost per day, month and year, including standby power, and compare it with another appliance.

By the CalcKite team · Last reviewed 19 Oct 2026 · Formula · Cite · Embed

Appliance Electricity Cost Calculator

Work out what any appliance costs to run per day, month and year from its watts, hours of use and your electricity price, and compare two appliances.

kWh per day = (watts × hours in use + standby watts × hours on standby) ÷ 1,000 Cost per month = kWh per day × days used × price per kWh Cost per year = monthly cost × 12

Example: A 1,000-watt heater for 2 hours a day. Energy: 1,000 W × 2 h × 30 days ÷ 1,000: 60 kWh a month; Cost at $0.20 per kWh: $12.00 a month; Per year: $144.00; Using it 1 hour less a day saves: $72.00 a year.

Understand the resultHow it works, worked example, formula and FAQ
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How to use the Appliance Electricity Cost Calculator

Find the wattage on the appliance’s label or measure it with a plug-in meter. Enter the hours you use it each day, the days a month and your electricity price per kWh from your bill. If it draws power when switched off, add the standby watts. To compare, enter a second appliance’s wattage and hours. The green box shows the monthly cost and the rows break it down per day and per year.

Worked example

A 1,000-watt heater for 2 hours a day

Energy: 1,000 W × 2 h × 30 days ÷ 1,00060 kWh a month
Cost at $0.20 per kWh$12.00 a month
Per year$144.00
Using it 1 hour less a day saves$72.00 a year

Assumptions and limits

  • The label wattage is the maximum. Fridges, AC units and washers cycle on and off, so their real use is often lower; a plug-in meter gives the real figure.
  • The electricity price is your own input. Check your bill for the price per kWh including delivery charges.
  • Time-of-use rates, where electricity costs more at peak hours, aren’t modelled.

Formula

kWh per day = (watts × hours in use + standby watts × hours on standby) ÷ 1,000 Cost per month = kWh per day × days used × price per kWh Cost per year = monthly cost × 12

Frequently asked questions

How do I calculate electricity cost from watts?

Multiply watts by hours used and divide by 1,000 to get kWh, then multiply by your price per kWh. A 1,000 W appliance used for 2 hours uses 2 kWh, which costs $0.40 at $0.20 per kWh.

What uses the most electricity at home?

Heating and cooling, water heaters, clothes dryers and electric cars use the most. Small devices on standby add up too, often 5–10% of a bill.

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Results are estimates for information only and are not financial, tax or legal advice. Tax rules, interest rates and fees change, so confirm important numbers with your bank, employer or a qualified adviser. Read our disclaimer.