Estimate the electricity use and running cost of any appliance by wattage, daily use, billing period, and local energy rate.
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01
Three numbers to estimate running cost
Enter power, daily use and the rate from your bill.
Try an example:
The starting values are illustrative, not your local tariff. Use your appliance label and latest bill. Presets change power and hours only.
Currency & period · USD · 30 days
Changing currency does not convert your rate. Enter the rate in the selected currency.
DECISION GUIDE
How to use this result in a real decision.
What does one appliance add to energy use under a stated usage pattern? Convert watts to kilowatts, multiply by hours and days, then apply the energy rate from a recent bill. The result isolates the entered appliance rather than predicting the full utility bill.
WORKED EXAMPLE
A 1,500-watt appliance used six hours daily
Inputs
1,500 watts, 6 hours per day, 30 days and an electricity rate of $0.17 per kWh.
Calculated result
Usage is 9 kWh per day and 270 kWh over 30 days. Estimated energy cost is $45.90 for the period.
Decision meaning
Reducing use by two hours a day would save about 90 kWh, or $15.30 at the same energy rate.
Check before acting
Use input power in watts; heating or cooling output ratings are not the same quantity.
For cycling equipment, use measured or average draw instead of continuous maximum wattage.
Take the per-kWh energy rate and billing structure from a current local utility bill.
Not included automatically
Fixed customer charges, taxes, minimum bills and demand charges
Tiered or time-of-use pricing unless represented by the entered average rate
Standby use and all other household or business equipment
How to use it
A useful answer in three steps.
01
Find the wattage on the appliance label or product specification.
02
Enter average daily use and the number of days you want to estimate.
03
Use the per-kWh rate shown on your latest utility bill.
Core formula
The math behind the result.
Cost = (watts ÷ 1,000) × hours per day × days × electricity rate