Electricity Calculator

Calculate electricity cost, usage, and power consumption for appliances and devices.

Result

Fill in the fields above, then press Calculate.

An electricity cost calculator estimates your energy bill based on appliance wattage, usage hours, and your local electricity rate.

Enter the wattage of an appliance, how many hours per day it runs, the number of days per month, and your electricity rate. The calculator shows daily, monthly, and annual energy usage and cost.

Examples

100W bulb running 8 hours/day

Daily: 100 x 8 / 1000 = 0.8 kWh. Monthly (30 days): 24 kWh. At $0.12/kWh: $2.88/month or $35.04/year.

1500W space heater, 4 hours/day

Daily: 1500 x 4 / 1000 = 6 kWh. Monthly: 180 kWh. At $0.12/kWh: $21.60/month.

Frequently Asked Questions

How do I find my cost per kWh?
Check your electricity bill. Divide the total charges by the total kWh used. The US average is approximately $0.12-$0.16/kWh but varies widely by state.
What uses the most electricity in a home?
Heating/cooling (HVAC) typically accounts for 40-50% of electricity use. Water heating, clothes dryers, and electric ovens are also major consumers.
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Quick Tips

  • •Check your utility bill or provider website for your exact cost per kWh, including delivery charges.
  • •Unplug appliances or use smart power strips to eliminate phantom power draw when devices are off.
  • •Switching to LED bulbs can reduce lighting electricity costs by up to 75%.