💡 Electricity Cost Calculator
Find the wattage on the appliance label, estimate how many hours a day it runs, and enter your electricity rate from your bill (in cents or dollars per kWh).
How the Electricity Cost Calculator works
Watts × hours ÷ 1,000 gives kilowatt-hours (kWh), the unit on your bill. Multiply by your rate for the cost. A month is counted as 30 days.
Step-by-step calculation
- 1Enter watts and hours per day.
- 2Convert to kWh.
- 3Multiply by your rate.
Worked example
A 1,500 W space heater running 4 hours a day uses 6 kWh a day. At $0.17 per kWh that is $1.02 a day, $30.60 a month and $372.30 a year.
Electricity Cost Calculator examples
| Power (watts) | Running cost |
|---|---|
| 750 | $15.30 / month |
| 1,125 | $22.95 / month |
| 1,500 | $30.60 / month |
| 1,875 | $38.25 / month |
| 2,250 | $45.90 / month |
Other inputs kept at the calculator's default values. Results calculated by this calculator.
Why use an Electricity Cost Calculator?
Find which appliances cost the most to run.
Important factors that can affect your results
- Appliances cycle on and off.
- Time-of-use rates.
- Standby power.
Frequently asked questions
Where do I find my rate?
On your electric bill, shown as cents or dollars per kWh. Include delivery charges for a more realistic number.
Do appliances use full power all the time?
Not always. Fridges and AC units cycle on and off, so real use can be lower than the label suggests.
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Last reviewed November 2026 · How we build and check our tools · Report a problem