Run 1000 W for two hours a day for 30 days
Input and settings
Power: 1000 W / Hours per day: 2 / Days: 30 Rate: 30 per kWh
Expected result
Cost: 1,800 Energy: 60 kWh
Electricity Cost Calculator
Estimate energy use and cost from watts, daily use, days, and price per kWh.
How to use
These are example steps; replace the values for your task.
- Enter 500 W, 2 hours, 30 days and a rate of 31.
- Check the energy and cost results.
Enter values
Result
See the kWh behind the estimated cost
Power in watts is divided by 1,000, then multiplied by hours per day and the number of days. A 1,000 W appliance used for 2 hours a day over 30 days uses 60 kWh.
The cost uses the price per kWh you enter. This makes it useful for comparing appliances or usage schedules without assuming a regional electricity tariff.
About this tool
Estimate kWh and running cost for an appliance over a chosen period. You can also compare different usage times or power ratings.
The estimate does not include standing charges, tiered pricing, taxes, or standby power. Enter a price per kWh that matches your bill.
Try a use case and check the result
Estimate energy use at constant power and its usage-based charge.
Example buttons replace the inputs and settings above and calculate. Restore previous input returns to the state before the latest example.
After trying multiple examples, repeat Restore previous input to return to your original input. History is kept only in this page; restore any input you need before closing it.
Set usage time to zero
Input and settings
Power: 100 W / Hours per day: 0 / Days: 30 Rate: 30 per kWh
Expected result
Cost: 0 / Energy: 0 kWh This does not mean the entire utility bill is zero.
How to read the result
Divide watts by 1000 to get kW, then multiply by hours and days for kWh. The first example gives 1×2×30=60 kWh and 60×30=1800. Zero hours produces zero usage charge.
Scope and limits
Hours per day must be 0–24; other values non-negative. This assumes constant power and rate, excluding fixed charges, tiers, fuel adjustments, taxes and time-of-use rates. Actual power varies with operating state. Money displays at most two decimal places. Sample rates are illustrative, not a contract tariff.
Verification: existing calculateElectricityCost checks cover 60 kWh and 1800, zero usage at zero hours, and rejection of 25 hours, compared with on-screen energy and cost.
Continue with the next task
Estimate 30 days of one appliance
A 500 W appliance used for 2 hours a day for 30 days at 31 per kWh uses an estimated 30 kWh and costs 930.
Energy is watts divided by 1,000, multiplied by daily hours and days. Cost is energy multiplied by the rate.
Daily use is limited to 24 hours. The estimate assumes constant input wattage; appliances with varying output may differ from measured use.
Frequently asked questions
What is one kWh?
A 1 kW appliance running for one hour uses 1 kWh. A 1000 W appliance running for two hours uses 2 kWh.
Will this match my electricity bill?
Not exactly. It estimates the appliance's energy cost and does not include standing charges or tiered rates.
Does it fetch electricity prices?
No. It uses only the price per kWh you enter.
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