What are you actually paying?

Your effective rate is the only number that matters, and it is not the rate you were quoted. Take it straight off your bill: the total you paid, and the kilowatt‑hours you used. Two numbers.

Nothing is uploaded and nothing is stored. This runs in your browser; we never see the numbers. Not sure which utility? It's named on the bill.

Why your effective rate is not the rate you were sold

The rate in the advertisement is an average calculated at one usage level, usually 1,000 or 2,000 kWh a month. Your bill is calculated at your usage, on a plan whose fees, credits and free‑hour windows all behave differently as usage moves. Divide what you paid by what you used and you get the only figure that is true for you.

If the two numbers are far apart, that is worth knowing before your contract renews. Here is why the gap is usually the marketing.

Uploading a bill

Not yet. Reading a PDF bill automatically means running it through a language model, which needs an API key attached to this site and a written retention policy to go with it. Until both exist, typing two numbers gets you the same answer and keeps your bill on your own computer.