Electricity Cost Calculator
Estimate monthly and annual electricity cost from watts, operating hours, quantity and utility rate.
Estimate monthly and annual electricity cost from watts, operating hours, quantity and utility rate.
Enter your own equipment values. The calculator uses transparent assumptions so you can adjust efficiency, reserve and operating conditions.
Use Real Equipment Ratings
Estimate monthly and annual electricity cost from watts, operating hours, quantity and utility rate.
Calculator Guidance
Use the result for planning, then verify the exact product manual, nameplate ratings and operating limits.
Electricity Cost Calculator
Planning estimate only.
Formula
Monthly cost = watts ÷ 1000 × hours/day × days × quantity × rate per kWh.
Examples
| Load | Use | Rate | Monthly Cost |
|---|---|---|---|
| 100W | 8h/day | $0.18/kWh | $4.32 |
| 1500W | 2h/day | $0.18/kWh | $16.20 |
| 500W | 24h/day | $0.18/kWh | $64.80 |
Billing Limits
Tiered Rates
Utilities may charge multiple rates.
Time of Use
Prices change by hour.
Demand Charges
Some plans add peak demand.
Taxes and Fees
Not included.
Cycling Appliances
Use measured average energy.
Solar Credits
Net metering changes net cost.
Frequently Asked Questions
What is a kWh?
One kilowatt used for one hour.
Where do I find my rate?
On the utility bill; include delivery charges when appropriate.
Does this include fees?
No.
How do I handle cycling appliances?
Use measured kWh or average watts.
What about time-of-use rates?
Calculate each period separately.
Can this estimate generator cost?
No, fuel cost needs a different calculator.