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Electricity Calculator

Estimate an appliance's electricity use and cost per day, week, month, and year from its power, duty cycle, usage, and electricity price.

ExampleSample values — edit any field to see your result.

Choose a preset or define your own values below.

Average percentage of rated power used while the appliance is operating.

per kWh

Results update as you type.

Electricity usage per day

24.000kWh

Estimated result

Cost per day
$3.60

Usage and cost by time span

Time spanElectricity usageCost
per day24.00$3.60
per week168.00$25.20
per month730.56$109.58
per year8,766.00$1,314.90
Electricity usage per day24.000 kWh
Estimate the energy and cost of an appliance over a day, week, month, and year. Choose a common appliance or enter its rated power, typical capacity, operating time, and your utility price.

Formula

daily kWh = watts ÷ 1,000 × hours per day × capacity ÷ 100

cost = kWh × price per kWh

Power units are converted to watts first. A BTU/hour is 0.293071 watts, one metric horsepower is 735.49875 watts, and one refrigeration ton is 3,516.853 watts.

Examples

1,000 W continuously

At 100% capacity for 24 hours, the appliance uses 24 kWh/day, 730.5 kWh/month, and 8,766 kWh/year. At $0.15/kWh that is $3.60/day and $1,314.90/year.
Use the energy label or a plug-in power meter when possible. Nameplate wattage is often a maximum, especially for heating, cooling, and motor loads.

Frequently asked questions

How do I calculate electricity cost?
Multiply rated kilowatts by operating hours and duty cycle to get kWh, then multiply kWh by your electricity price.
Why does an appliance use less than its rated wattage?
Thermostats and variable-speed controls cycle equipment, so the capacity percentage estimates its average load while scheduled to run.
How is a month calculated?
Monthly estimates use one twelfth of 365.25 days, or 30.4375 days.

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