Electricity Cost Calculator
Calculate electrical appliance power cost per month and year.
Electricity Cost Calculator
Calculate appliance power consumption in kWh and estimated monthly or annual electricity bill costs.
What is the Electricity Cost Calculator and How Does It Work?
The Electricity Cost Calculator estimates how much it costs to run any electrical appliance by converting its wattage and daily usage hours into kilowatt-hours (kWh), then multiplying by your local electricity rate.
An appliance's power draw in watts is converted to kilowatts, multiplied by how many hours per day it runs, then multiplied by the number of days and your electricity rate to get total cost.
Daily kWh = (1000/1000)×8 = 8 kWh; monthly = 8×30 = 240 kWh; cost = 240×$0.15 = $36.00.
Daily kWh = (100/1000)×5 = 0.5 kWh; monthly = 0.5×30 = 15 kWh; cost = 15×$0.15 = $2.25.
Common Real-World Use Cases
Compare the running cost of different appliances (e.g. a space heater vs. central heating) before buying.
Identify which high-wattage appliances are driving up an unexpectedly high electricity bill.
Estimate annual energy costs for appliances when planning a home energy audit or solar system size.
- 1Enter the appliance's wattage (check the label or manual).
- 2Enter how many hours per day it typically runs.
- 3Enter your electricity rate per kWh from your utility bill.
- 4View the estimated daily, monthly, and yearly cost.
- •Your exact electricity rate is on your utility bill, usually listed as cents or dollars per kWh.
- •For appliances with a range (like refrigerators that cycle on and off), use the average wattage from the appliance's energy guide label.
- •Leaving the Cost per kWh field blank or at 0. Unlike the wattage and hours fields, there's no built-in default rate (electricity prices vary too much by region to assume one) - if the rate is empty, the calculator will show a "valid" result of $0.00 rather than an error, which can look like a real answer instead of a missing input.
Frequently Asked Questions
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