MiniCalci

Calculators & Converters
Everyday Math

Electricity Cost Calculator

Free electricity cost calculator to estimate monthly and annual power costs for household appliances (space heaters, AC, refrigerators, EV chargers, PCs).

US average is about $0.16/kWh. Use the supply rate from your utility bill.

What does it cost to run this appliance?

Energy (kWh) = watts × hours ÷ 1000. Cost = kWh × your rate from the electric bill (US residential is often $0.12–$0.30+/kWh depending on state). A 1500 W space heater for 8 hours is 12 kWh — at $0.20 that is $2.40 for that day, not “pennies.”

Nameplate watts vs what you pay

  • Motors and compressors cycle; a fridge is not drawing full watts 24/7
  • Phantom loads are small individually and add up annually
  • Your bill rate may include delivery charges — use the blended $/kWh from the last bill if you can

Frequently Asked Questions

How do I calculate how much electricity an appliance uses?
Multiply the wattage of the appliance by the number of hours it runs per day, then divide by 1,000 to find the daily Kilowatt-hours (kWh). Multiply that number by your electricity rate per kWh. Formula: **Cost = (Watts × Hours × Rate per kWh) / 1,000**.
How much does it cost to run a 1,500W space heater?
A 1,500-watt space heater uses 1.5 kWh of electricity per hour. At the US national average rate of $0.16/kWh, it costs approximately **$0.24 per hour**, **$1.44 per 6-hour day**, or **$43.20 per month**.
What uses the most electricity in an average home?
Heating and cooling (HVAC / central air) accounts for nearly 45–50% of the average home's electric bill. The next largest consumers are electric water heaters (18%), clothes dryers (5%), refrigerators (4%), and lighting.
Where do I find my electricity rate per kWh?
Check your monthly electric utility bill under the 'Supply' or 'Generation' charges. In the US, average rates range from $0.12 to $0.28 per kWh (national avg ~$0.16).

Related Calculators

CALC

Gas Mileage Calculator

Calculate vehicle MPG and fuel cost per mile across US, UK, and Metric units.

Open calculator
CALC

Salary to Hourly Wage

Convert annual salary to hourly, weekly, and monthly take-home rates.

Open calculator
CALC

Percentage Calculator

Calculate percent change, percent differences, and discounts.

Open calculator
About these results: Figures are for planning only. Confirm anything you will buy, bill, or submit (materials, payroll, medical screening) against the label, a quote, or a professional.