Electricity Cost Calculator
Calculate power consumption in kilowatt-hours (kWh) and estimate monthly and annual electricity costs for any home appliance.
About the Electricity Cost Calculator
The Electricity Cost Calculator helps homeowners, renters, and facility managers quantify how much electricity household appliances consume and what they cost to run. From air conditioners and space heaters to crypto mining rigs and refrigerator compressors, power consumption can dramatically inflate utility bills.
Enter the appliance wattage, daily runtime hours, and your utility electricity tariff rate per kilowatt-hour (kWh) to receive daily, monthly, and yearly cost projections.
How to Calculate Electricity Cost
Locate the wattage rating on the appliance label or manual (e.g., 1500W for a space heater).
Enter the estimated hours the appliance operates each day.
Enter your local utility cost per kWh (check your monthly electric bill; standard US rate is ~$0.16/kWh, UK ~£0.28/kWh).
Click Calculate to see daily, monthly, and yearly consumption in kWh and monetary cost.
Kilowatt-Hour and Energy Cost Formulas
Daily Energy (kWh) = (Appliance Watts × Hours per Day) / 1000 Cost = Energy (kWh) × Electricity Rate per kWh Monthly Cost = Daily Cost × 30 days Yearly Cost = Daily Cost × 365 days
Convert appliance power rating in watts to kilowatts by dividing by 1,000, multiply by hours of daily operation, and multiply by utility rate per kWh.
Variable Descriptions
- Wattage
- Rated power consumption of the appliance in Watts (W)
- Hours/Day
- Average active runtime per 24-hour cycle
- Rate ($/kWh)
- Electricity utility cost per kilowatt-hour
Worked Example
Important Considerations & Tips
- Appliance labels list maximum peak wattage; appliances with thermostats (like refrigerators and ACs) cycle on and off, reducing average consumption.
- 1 Kilowatt (kW) = 1,000 Watts (W). 1 Megawatt (MW) = 1,000,000 Watts.
- Check your utility bill for tiered or peak time-of-use (TOU) rates during summer and winter.
Frequently Asked Questions
How do you calculate appliance power cost?
Multiply appliance wattage by daily hours, divide by 1,000 to get daily kWh, and multiply by your utility rate per kWh.
Where can I find the wattage of an appliance?
Appliance wattage is typically stamped on an electrical certification label located on the back or bottom of the device, or inside the instruction handbook.
Which home appliances use the most electricity?
Heating and cooling systems (central AC and heat pumps), water heaters, clothes dryers, and electric ovens consume the highest amount of household power.
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