WattNomic

Calculator

Electricity bill calculator

Estimate monthly and annual electricity cost from usage, local cents per kWh, and fixed utility charges.

Live estimate

Use your bill. Instant updates.

Estimated electricity cost
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State defaults

Use a public rate when you do not have a bill handy.

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Fast bill examples California 900 kWh billMichigan 900 kWh billVermont 900 kWh billHawaii 900 kWh bill
Fast answer

Utilities bill calculator: kWh, rate, and fixed fees are the three numbers that matter first.

Use kWh from your bill, cents per kWh from your rate plan, and fixed monthly charges. The result updates instantly and links into state-rate defaults when you do not have your exact utility rate.

Formula visibleEIA defaultsEditable assumptions Reviewed: May 2026

Common questions

How do I calculate an electric bill from kWh?

Multiply monthly kWh by cents per kWh, divide by 100, then add fixed monthly charges, taxes, and riders if they are listed separately on your bill.

What is a normal monthly electric bill?

A normal bill depends on usage, state electricity rate, home size, weather, and fixed charges. WattNomic compares your entered bill with a state-rate benchmark so you can see whether it looks low, normal, high, or unusually high.

Should I use the state electricity rate or my utility rate?

Use your utility bill when possible. State rates are useful defaults for screening, but your actual supply, delivery, taxes, and plan terms can differ.

kWh cost

Popular kWh cost examples

These examples match the exact usage-style searches Google is already testing: kWh amount, cents per kWh, and monthly cost.

1 kWh cost$0 at 18.35 cents/kWh before fixed fees.51 kWh cost$9 at 18.35 cents/kWh before fixed fees.97 kWh cost$18 at 18.35 cents/kWh before fixed fees.222 kWh cost$41 at 18.35 cents/kWh before fixed fees.245 kWh cost$45 at 18.35 cents/kWh before fixed fees.500 kWh cost$92 at 18.35 cents/kWh before fixed fees.900 kWh cost$165 at 18.35 cents/kWh before fixed fees.1,200 kWh cost$220 at 18.35 cents/kWh before fixed fees.