Free Electricity Cost Calculator
Find out what any appliance really costs to run. Enter its wattage, daily usage hours and your electricity rate to get energy consumed in kWh plus the total cost — and the per-hour and monthly figures.
How to Use the Electricity Cost Calculator
- Enter the appliance’s wattage (on its label).
- Enter daily usage hours, number of days and your $/kWh rate.
- Click Calculate Cost for kWh used and total cost.
Features
Converts watts to kilowatt-hours with the standard formula, then breaks the cost into per-hour, per-day and per-month views so you can compare appliances and spot energy hogs.
Benefits & Use Cases
Homeowners hunt down the culprits behind high bills, renters estimate costs before buying a space heater or AC, and off-grid planners size their power needs.
Tips
Check your bill for the true per-kWh rate including delivery charges — the headline energy rate alone understates the cost. Appliance wattage is printed on its label or manual.
Frequently Asked Questions
How is electricity cost calculated?
Watts ÷ 1000 × hours × days gives kWh; multiply by your $/kWh rate for the cost.
Where do I find my kWh rate?
On your electricity bill, listed as the supply charge — add delivery fees per kWh for the true rate.
What uses the most electricity at home?
Heating, cooling and water heating top the list; a 1500W space heater costs about $0.22 per hour at average US rates.
Does standby power matter?
Yes — devices on standby sip 1–10W continuously, which adds up over a year for always-plugged gear.
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