Electricity Cost Calculator
Electricity Cost: Cost = kWh × price per kWh + fixed charge + billed kW × demand charge. Methodology stated, your own inputs only.
In short
Electricity Cost: Cost = kWh × price per kWh + fixed charge + billed kW × demand charge. Methodology stated, your own inputs only.
Formula: Cost = kWh × price per kWh + fixed charge + billed kW × demand charge.
What this calculator does
Electricity Cost: Cost = kWh × price per kWh + fixed charge + billed kW × demand charge. Methodology stated, your own inputs only. Worked example, questions and limitations included.
Use it to turn Currency (symbol only, never converted), Energy used in the period, Your energy price per kWh (from your bill or a saved rate), Fixed charge for the period (blank = none), and the other shown inputs into a checked result you can compare, copy, or rerun with different assumptions.
The page shows the formula, a numeric worked example, and the assumptions that affect this energy calculation.
Inputs and what they mean
- Currency (symbol only, never converted)
- — choice value.
- Energy used in the period
- — number value.
- Your energy price per kWh (from your bill or a saved rate)
- — number value.
- Fixed charge for the period (blank = none)
- — number value.
- Billed peak demand (blank = none)
- — number value.
- Demand charge per kW (blank = none)
- — number value.
How to use it
- Enter each value in the unit shown next to the box (use the unit converter first if your numbers are in other units).
- Check the breakdown to see every intermediate step.
- Read the limitations before relying on the result.
Formula
Methodology: a bill split into energy, fixed and demand components, the structure the U.S. EIA describes for electricity prices.
No price is built in — every rate comes from your bill, contract or a dated saved rate.
Taxes, time-of-use bands and tiered blocks are not modelled; run each band separately.
Cost = kWh × price per kWh + fixed charge + billed kW × demand charge.
Inputs used: Currency (symbol only, never converted), Energy used in the period, Your energy price per kWh (from your bill or a saved rate), Fixed charge for the period (blank = none), Billed peak demand (blank = none), Demand charge per kW (blank = none).
Worked example
A month
- 1,200 × 0.15 = $180.
- 180 + 10 = $190.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Saved energy rates
No reference rates are saved yet. Enter the price per kWh from your own bill — this site never assumes one.
Limitations and assumptions
- Single flat energy rate; tiered and time-of-use tariffs need one run per band.
- Taxes, levies and credits are not added.
- Results are estimates built only from the figures you enter. No electricity, fuel or gas price, equipment efficiency or benchmark is built in — tariffs vary by supplier, region and time, and equipment data must come from the manufacturer. Designs and installations must be checked by a qualified professional.
- The result depends on the values you enter for this electricity cost calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.
Reference: U.S. EIA
Last reviewed:
Common questions
Why isn't an electricity or fuel price filled in?
Prices differ by country, supplier, tariff and time of use, so there is no universal figure. Enter the rate from your bill or contract, or pick a dated saved rate if one is listed on the page.
What is a demand charge?
A charge on your highest metered power (kW) in the billing period, common on business tariffs. Leave it blank if your bill has none.
Why is my average per kWh higher than the rate?
Fixed and demand charges are spread over the energy you used, so the average rises when usage is low. Check the formula, example, and limitations on this page before using the result for a real energy decision.
How do I use the Electricity Cost Calculator?
Enter the required values for Currency (symbol only, never converted), Energy used in the period, Your energy price per kWh (from your bill or a saved rate), Fixed charge for the period (blank = none), Billed peak demand (blank = none), and the other fields shown. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.
What formula does the Electricity Cost Calculator use?
Cost = kWh × price per kWh + fixed charge + billed kW × demand charge. The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.
Can the Electricity Cost Calculator be used for exact decisions?
Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.
Sources
Method based on U.S. EIA.
Cite this page
Free Calculator. (2026, October 20). Electricity Cost Calculator. https://freecalculator.tech/tools/electricity-cost-calculator
"Electricity Cost Calculator." Free Calculator, 20 Oct. 2026, https://freecalculator.tech/tools/electricity-cost-calculator.
Electricity Cost Calculator — Free Calculator, https://freecalculator.tech/tools/electricity-cost-calculator
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