python3 -m http.server, instead of opening index.html directly.
Where is this bill from?
Pick your country and the form will pre-label the line items the way they appear on a typical bill there. Your data never leaves your device; the only network requests on this page are the site's own analytics (Google Analytics and a Cloudflare beacon), which load when the page opens and never see your files.
Enter your bill —
Copy each line exactly as it appears on your bill. Leave out any line your bill doesn't have — and add custom lines for anything unusual.
Usage
Bill line items
Decoded —
Here's what every line on your bill really costs you, in one number.
Your true all-in rate
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Where your money goes
Anomaly check
Every line, in plain English
What you can do about it
Month over month
Saved only in this browser — nothing is uploaded.
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Electricity bill questions, answered
What is the true all-in cost per kWh?
Your total bill divided by the kWh you used. Unlike the advertised supply rate, it includes delivery charges, fixed fees, riders, levies and taxes — everything you actually paid.
Why is my bill higher than the advertised per-kWh rate suggests?
The advertised rate usually covers only the supply (energy) portion. Delivery charges, customer or standing charges, riders and taxes are added on top, so the true per-kWh cost is almost always higher.
What's the difference between supply and delivery charges?
Supply is what you pay for the electricity itself. Delivery is what you pay the utility that owns the poles, wires and transformers to carry it to your home. Supply can often be shopped around; delivery is regulated and cannot.
What is a standing charge on a UK bill?
A flat daily fee for staying connected to the grid — network upkeep, metering and supplier admin. It accrues every day even at zero usage, which is why low-usage households can have a surprisingly high true per-kWh cost.
What do Grundpreis and Arbeitspreis mean on a German bill?
Arbeitspreis is the per-kWh working price for the energy you use. Grundpreis is a flat monthly base fee for the grid connection, metering and billing, due regardless of usage. German bills also itemize grid fees (Netzentgelte), levies and 19% VAT.
Is my bill data sent anywhere?
Your data never leaves your device; the only network requests on this page are the site's own analytics (Google Analytics and a Cloudflare beacon), which load when the page opens and never see your files. Month-over-month history lives only in your browser's local storage.