kWh Electricity Cost Calculator
Running cost of an appliance from its wattage and usage.
Enter your values
ⓘ Live results
Results
- Daily cost
- $0.72
- Monthly cost
- $21.6
- Annual cost
- $262.8
- Daily energy use
- 4.5 kWh
Quick answer
Cost = watts / 1000 x hours used x price per kWh.
Cost = (W/1000) x hours x rate
How to use the kWh Electricity Cost Calculator
- 1Enter the appliance's power draw in watts (check the nameplate or a plug-in meter).
- 2Enter typical daily hours of use.
- 3Enter your electricity rate to see daily, monthly and annual cost.
Worked example
Using the values the calculator loads with:
Inputs
- Appliance power1500 W
- Hours used per day3 hours
- Electricity rate0.16 $/kWh
Results
- Daily cost$0.72
- Monthly cost$21.6
- Annual cost$262.8
- Daily energy use4.5 kWh
Frequently asked questions
Where do I find my electricity rate?
Check a recent utility bill; it's usually listed per kWh, sometimes with tiered pricing.
Does standby power matter?
Yes — many devices draw a small standby load 24/7 that adds up; measure with a plug meter for accuracy.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.