Does this pull my utility rate automatically?

No. You enter the rate from a bill or published tariff.

What is effective rate?

Monthly total divided by monthly kWh when usage is greater than zero, so fixed fees raise the effective $/kWh.

Can I model solar or EV charging here?

Use this for whole-home kWh totals. Dedicated solar and EV worksheets exist in related clusters once they are live; appliance pages help break out individual loads.

Electricity Cost Calculator

Estimate monthly and yearly electricity cost from kWh usage, $/kWh rate, and an optional fixed fee—educational bill math, not your utility invoice.

Monthly bill estimate

Yearly projection

Effective rate with fees

Multiplies monthly kilowatt-hours by your entered rate, adds an optional fixed fee, and scales to a twelve-month total.

Limitation: Educational estimate only.

Jump to calculator · Sources & review

CurrencyMonthly electricity use (kWh)From your bill or meter. 1 kWh = 1000 watt-hours.Energy rate ($/kWh)Fixed monthly fee (optional)Customer charge or similar flat fee. Use 0 if none.

How to Use the Electricity Cost Calculator

Enter the fields below, then review kWh and cost outputs.

Choose a display currency (no conversion is applied).

Use the energy charge line

Prefer the volumetric energy rate on your bill, not a blended total that already folds in taxes you want to model separately.

What This Calculator Estimates

This worksheet multiplies monthly kWh by a flat rate and adds an optional fixed fee. It does not encode tiered rates, demand charges, or taxes.

Worked Examples

Typical household month

Inputs

monthlyKwh:900

ratePerKwh:0.14

fixedMonthlyFee:12

Estimated cost

$138.00 monthly; $1,656.00 yearly

Energy = 900 × 0.14 = 126; + 12 fee = 138; × 12 = 1,656.

Usage-only scenario

Inputs

monthlyKwh:500

ratePerKwh:0.12

fixedMonthlyFee:0

Estimated cost

$60.00 monthly; $720.00 yearly

500 × 0.12 = 60 with no fixed fee.

Compare to your bill

If estimates diverge from billed kWh, check hours, duty cycle, and whether your rate is tiered or time-of-use.

Frequently Asked Questions

No. That URL is an alias of this electricity cost calculator.

Still have questions about this calculation?

Try the Calculator

Formulas & Assumptions

Transparent arithmetic from user-entered inputs. No live utility tariffs are loaded.

Formula

monthlyKwh × ratePerKwh

Energy charge

monthlyKwh × ratePerKwh

Monthly total

energyCharge + fixedMonthlyFee

Yearly total

monthlyTotal × 12

Scientific Background

Assumptions: flat rate, constant monthly usage, optional fixed fee only. Limitations: real tariffs may use tiers, time-of-use, demand, riders, and taxes.

Sources & review

Electricity Cost Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.

Last reviewed

July 22, 2026

Reference
energy.gov
https://www.energy.gov/energysaver/estimating-appliance-and-home-electronic-energy-use
Reference
eia.gov
https://www.eia.gov/energyexplained/units-and-calculators/energy-conversion-calculators.php
Free Calculator Hub methodology
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See our methodology and corrections policy.