kWh Cost Calculator
Calculate electricity cost from energy use and price per kWh.
How Electricity Cost Is Calculated
Electricity bills are usually based on the amount of energy consumed in kilowatt-hours and the utility’s rate per kWh. This calculator multiplies those two values to estimate the energy charge for a device, period or total household usage.
Formula
Electricity Cost = Energy Used (kWh) × Price per kWh
Worked Example
If you use 350 kWh and your electricity price is 0.18 per kWh, the estimated energy cost is 350 × 0.18 = 63.00.
Factors That Affect the Final Bill
Your actual bill may include fixed service charges, taxes, tiered pricing, time-of-use rates, demand charges or renewable-energy fees. The calculator estimates the variable energy portion only unless those costs are already included in the price per kWh you enter.
Frequently Asked Questions
Where can I find my price per kWh?
Check your electricity bill or utility tariff. Divide the energy charge by billed kWh if a clear unit rate is not shown.
Can I use this for one appliance?
Yes. First estimate the appliance’s kWh consumption, then multiply it by the applicable electricity rate.
Why can my bill be higher than this estimate?
Utilities may add taxes, fixed fees and other charges that are not captured by a simple kWh multiplication.
Methodology and Practical Limits
Electricity cost is energy use in kWh multiplied by the applicable tariff. Tiered pricing, time-of-use rates, taxes, fixed charges and demand fees can make the bill differ from a single-rate estimate.