Electricity Cost Calculator
What any appliance costs to run — per day, per month, per year. Pick a preset or enter the wattage from the device label.
Running cost
| Energy used per day | — |
| Cost per day | — |
| Cost per month | — |
| Cost per year | — |
Rates: EIA average residential price, April 2026. Many appliances (fridges, PCs) cycle or idle below their rated wattage — a plug-in energy meter gives the most accurate number.
How this is calculated
kWh per day = watts ÷ 1000 × hours per day × (days per week ÷ 7), then cost = kWh × rate. Monthly cost uses the average month length (365.25 ÷ 12 ≈ 30.44 days). Nothing else — no hidden fudge factors.
FAQ
How do I calculate the cost of running an appliance?
Multiply the appliance's power in kilowatts (watts ÷ 1000) by the hours it runs, then by your electricity rate per kWh. Example: a 1,500 W space heater running 4 hours at 18.83¢/kWh costs 1.5 × 4 × $0.1883 ≈ $1.13 per day.
Where do I find my appliance's wattage?
Check the label on the back or bottom of the device, its power adapter, or the manual. If the label only lists amps, multiply amps × 120 V (US outlets) to get watts. Many appliances draw less than their rated maximum, so a plug-in energy meter gives the true figure.
Where does the electricity rate come from?
State averages come from the U.S. Energy Information Administration's monthly average residential retail prices. Your actual rate is on your utility bill — enter it in the rate field and it overrides the state average.
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