Electricity bill calculator
Estimate a monthly electricity bill from average daily kWh or watts and runtime.
What this calculator covers
Use this calculator to estimate a billing-period total from either direct daily kWh usage or a watts-times-hours runtime estimate.
The output is a simplified cost projection. Real utility bills can also include tiered pricing, taxes, minimum charges, and seasonal or time-of-use adjustments.
Frequently asked questions
- How do I find my actual rate per kWh?
- Your rate per kWh appears on your utility bill, usually labeled "energy charge" or "distribution charge." If your plan uses tiered pricing, you can use your average blended rate — divide your total energy charge by the total kWh billed — for a close approximation.
- What is the fixed monthly fee field for?
- Many utilities charge a flat base or customer charge each month regardless of how much electricity you use. Entering that amount here adds it on top of the usage-based energy charge so the estimate reflects your full monthly obligation more closely.
- Why might my estimate differ from my actual bill?
- Real bills often include time-of-use pricing, demand charges, taxes, fuel adjustments, and seasonal rate changes that a flat-rate model cannot capture. The estimate is useful for ballpark budgeting, but comparing it to a recent bill is the best way to calibrate your inputs.
- Can I use this to estimate a single appliance's share of the bill?
- Yes. Switch the input mode to watts and hours per day, enter the appliance's wattage and your typical daily runtime, then set billing days to 30. The result approximates that appliance's monthly contribution to your bill at the entered rate.
Tool
Run the calculation
Result
RESULT · ESTIMATED BILL
â„–193
Primary result
$98.40
At $0.16 per kWh over 30 days, the estimated bill is $98.40 for 540.00 kWh plus any fixed fee.
- Average daily usage
- 18.000 kWh/day
- Total billed usage
- 540.00 kWh
- Energy charge
- $86.40
- Fixed fee
- $12.00
Step-by-step solution
- 1.Convert the usage input into an average daily consumption of 18.000 kWh/day.
- 2.Multiply daily usage by 30 billing days to reach 540.00 kWh.
- 3.Apply the energy rate and add the fixed fee: $86.40 + $12.00 = $98.40.
Walkthrough
Visual walkthrough
Monthly electricity bills are driven by billed energy first, then by the tariff applied to each kWh, plus any fixed service charge.
01
Normalize the usage input
18.000 kWh/day
The calculator accepts either direct daily energy usage or a device wattage-and-runtime estimate.
02
Expand to the whole billing period
18.000 x 30
Billing-period energy is the average daily load multiplied by the number of days on the bill.
03
Price the total energy
The tariff converts total kWh into dollars, then the fixed charge is added on top of that energy cost.
$98.40