Tool · Electrical
Electricity Cost Calculator
See what an appliance really costs to run. Enter its power in watts, how long you use it, and your electricity rate.
$0.00
per day
$0.00
per month
$0.00
per year
How it's calculated
Electricity is billed by the kilowatt-hour (kWh) — using 1000 watts for one hour. The math:
- kWh per day = watts ÷ 1000 × hours. Example: 1500 ÷ 1000 × 4 = 6 kWh.
- Daily cost = kWh × rate. Example: 6 × $0.15 = $0.90.
- Multiply by days for the month, and by 365 for the year.
Your rate is on your power bill (look for "price per kWh"). The U.S. average is around $0.15–$0.18, but it varies a lot by state.
Related: Ohm's law calculator →