Calculator
Electricity Cost Calculator
Estimate appliance energy use and electricity cost from watts, daily hours, price per kWh, and days used.
Result
Energy used
90 kWh
Estimated total cost
$14.40
Estimated daily cost
$0.48
How to use this calculator
What this calculator does
Estimate appliance energy use and electricity cost from watts, daily hours, price per kWh, and days used.
How to use it
Enter your appliance power, hours used per day, electricity price, and days used, then review the result, formula, example, and FAQs below. Try a few scenarios to see which inputs move the result most.
What the result means
Use the result as a direct calculation from the values you entered. If it looks off, check the inputs and formula shown on this page.
Browse more energy & home calculators for related estimates and comparisons.
Results are estimates for planning and education. Actual costs depend on tariffs, usage habits, climate, equipment efficiency, local prices, maintenance, and provider rules.
Scenario guidance
When to use this
Use this when estimating the cost of running an appliance, device, or household load for a set number of days.
Example scenario
A household wants to compare how much a space heater, dehumidifier, or gaming setup may add to the monthly electric bill.
Inputs that usually matter most
- Appliance power in watts, because it determines the hourly energy use.
- Hours used per day and days used, which control total runtime.
- Electricity price per kWh, which should reflect the rate you want to estimate.
Common mistake to avoid
Do not assume the rated wattage is always the exact real-world draw; many appliances cycle, throttle, or vary by setting.
How to interpret the result
Use kWh, total cost, and daily cost as practical estimates, then compare them with your utility tariff, usage habits, and actual meter data.
Results are estimates. Actual costs can vary by tariffs, equipment efficiency, settings, usage patterns, and provider pricing.
Formula
Total cost is kWh used multiplied by electricity price per kWh. Daily cost divides total cost by days used.
Example electricity cost
A 1,500 watt appliance used 2 hours per day for 30 days uses 90 kWh. At $0.16 per kWh, the estimated total cost is $14.40.
Frequently Asked Questions
What is a kWh?
A kilowatt-hour is 1,000 watts used for one hour. Utilities commonly bill electricity usage in kWh.
Why might my bill differ from this estimate?
Actual bills can include tiered rates, fixed fees, taxes, demand charges, usage variation, and appliance efficiency differences.
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