Finance
Electricity Cost Calculator
Find the monthly cost of running any appliance from its wattage, daily usage, and your electricity rate.
Monthly Cost
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How It Works
Monthly Cost = (Watts Γ· 1000) Γ Hours per Day Γ 30 days Γ Rate per kWh. Watts Γ· 1000 converts to kilowatts, and kWh is what your utility bills.
Example
A 1,500 W space heater running 4 hours/day at $0.15/kWh = 1.5 Γ 4 Γ 30 Γ 0.15 = $27.00/month.
Frequently Asked Questions
How do I find an applianceβs wattage?
Check the label or manual, or multiply volts Γ amps. A kill-a-watt meter measures actual draw, which is often below rated watts.
What is the average electricity rate?
The US average is around $0.16β0.17/kWh (2025), ranging from ~$0.10 in some states to over $0.40 in Hawaii. Check your bill for the exact rate.
Which appliances cost the most to run?
HVAC, water heaters, dryers, and space heaters dominate. Anything that makes heat with electricity is expensive to run for long periods.