Watts In My Bill

Upload a photo or PDF of your bill and get a plain-English breakdown of every charge in seconds

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Energy billing is more complex than it looks. Errors are more common than suppliers admit. Backbilling (charges for periods you have already paid), re-billing surprises, and consumption estimates that do not match your meter are all worth catching. We will give your bill a quick review and flag anything that looks off.
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Drop your energy bill here

PNG, JPG or PDF - click or drag and drop

UK energy bills only - all Ofgem-regulated suppliers

Reading your bill · extracting charges · crunching numbers...

Not sure what you will get? This is a sample of how the tool breaks down a real bill - your numbers will appear above once you scan yours.

Bill Breakdown

£312.47 total

📋 Bill Summary

Supplier
British Gas
Tariff
Standard Variable
Variable
Period
Jan to Mar 2025
⚡ Elec rate
28.34p/kWh ▲ 3.84p above Q2 cap ▲ 2.23p above Q3 cap
⚡ Elec standing
61.64p/day ▲ 4.43p above Q2 cap ▲ 4.45p above Q3 cap
🔥 Gas rate
7.89p/kWh ▲ 2.15p above Q2 cap ▲ 0.56p above Q3 cap
🔥 Gas standing
31.41p/day ▲ 2.31p above Q2 cap ▲ 2.37p above Q3 cap
📍 London region · SW6 1AA
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Estimated annual spend
£1,270
~£106/month · based on your quarterly bill · usage patterns may vary seasonally

⚡ The Verdict

You are on British Gas's standard variable tariff - their default rate, and not their cheapest. Both your electricity and gas rates are sitting slightly above what most households pay right now, adding roughly £120 to £150 a year to your bill that you do not need to pay.

Your usage looks typical for a two-bed home, though it is worth checking whether the meter read was estimated. You are on the deal people end up on by default - switching to a fixed tariff could save around £150 a year with no real downside.

What the scanner extracts from your bill

When you upload a photo or PDF, the AI reads your bill and pulls out the key details: your supplier name, tariff type (fixed or variable), electricity and gas unit rates in pence per kWh, standing charges in pence per day, your total consumption in kWh, billing period, and contract end date where shown. It then compares your rates against the current Ofgem price cap for your region.

How to read your energy bill

Every UK energy bill has two main charges. The unit rate is what you pay per kilowatt-hour (kWh) of gas or electricity you actually use - under the April 2026 Ofgem cap that is around 24.5p/kWh for electricity and 6.76p/kWh for gas. The standing charge is a fixed daily fee you pay just for being connected to the grid, even if you use nothing at all - roughly 61p/day for electricity and 32p/day for gas.

Why this matters

The Ofgem price cap sets the maximum your supplier can charge on a default tariff, but it does not mean you are on the cheapest deal. Fixed tariffs from smaller suppliers regularly beat the cap by £100 to £250 a year.

If the scanner shows your unit rates sitting at or above the cap, there is almost certainly a cheaper deal available. You do not need to switch to use this tool - but knowing your numbers is the first step.

Frequently asked questions

What file types does the scanner accept?

PNG, JPG, and PDF. It works with bills from all major UK suppliers - British Gas, Octopus, E.ON, EDF, OVO, Scottish Power, and most smaller suppliers. Any clear photo or scan will work.

Is my data safe?

Yes. Your bill image is sent to the analysis API and is not stored after processing. We extract only the rate information needed - supplier, unit rates, standing charges, consumption, and region.

No account numbers, payment details, or personal data are saved.

What if the AI misreads something?

AI extraction is accurate for the vast majority of standard UK bills but can occasionally misread unusual layouts, handwritten notes, or low-resolution images.

Always check the extracted figures against your original bill. If something looks wrong, try uploading a clearer photo or a PDF version for better results.

Do I have to switch supplier to use this?

No. The scanner is completely free with no obligation to switch. It breaks down what you are currently paying so you can understand your bill.

If the analysis shows you could save, that is your choice to act on.

Is my energy bill too high?

A typical UK household on a standard variable tariff spends around £1,100 to £1,400 per year on dual fuel. If your annual spend is significantly above that figure, it is worth checking whether your tariff is competitive and whether any meter readings have been estimated rather than actual.

This tool compares your unit rates directly against the regulated price cap so you can see at a glance whether you are paying above the market rate.

What is backbilling on an energy bill?

Backbilling occurs when a supplier charges you for energy used more than 12 months ago that was not billed at the time. This commonly happens when meter readings have not been submitted and the supplier has been using estimated figures.

Under Ofgem rules, suppliers cannot recover charges for gas or electricity used more than 12 months before the error is identified. If your bill appears to cover an unusually long period, you may have grounds to dispute the older charges.

How do I know if I am being overcharged for energy?

The most reliable method is to compare your unit rate and standing charge against the current Ofgem price cap. The cap sets the maximum a supplier can charge on a standard variable tariff. If your rates are above the cap, you are overpaying.

This tool extracts those figures from your bill automatically and flags any that sit above the regulated limits.

What is the difference between a fixed and variable energy tariff?

A fixed tariff locks your unit rate and standing charge for a set period, typically one to two years, regardless of what happens to wholesale prices. A variable tariff moves in line with the Ofgem price cap, which is reviewed quarterly.

Fixed tariffs from smaller suppliers currently offer rates that beat the variable cap by £100 to £200 per year for many households, alongside competitive exit terms on some deals.

Find your best deal

Every deal scored on price, service, complaints, and exit fees - so you switch with confidence, not just on sticker price.

Find your best deal →

Sources and References

  1. Ofgem - Price cap level and the factors that affect it
  2. Ofgem - Back-billing rules for energy suppliers
  3. Citizens Advice - Understanding your energy bill
  4. Department for Energy Security and Net Zero - UK energy statistics