As of 13 August 2026, AI can estimate your future energy bill.
Most people should hand this to a purpose-built tool.
Can you do it?
5 minutesto a draft.
30 minutesto something you’d act on.
Cost, all in£0
Skill needednone
Who has to check ityou
What the alternative costsThe alternative is a manual spreadsheet calculation using your bill, meter readings and tariff; no price is stated here.
If this goes wrong: you budget too little and have to cover a higher supplier bill than expected.
What to actually do
Use a tool built for this
The route this page recommends
Do it yourself
Second choiceA chat interface, no skill needed, and roughly 30 minutes until you can act on the result.
How to actually do it
- Open your latest energy bill and copy the billing period, electricity usage, gas usage, unit rates, standing charges, discounts and whether VAT is included.
- Open your supplier's current tariff information and copy any rate change date or future rate that applies to your account.
- Take current electricity and gas meter readings, record the reading dates, and use them to replace estimated readings where your bill is based on estimates.
- Paste the copied figures into the prompt, keeping electricity and gas figures separate and stating the period you want estimated.
- Ask the chatbot to calculate the bill and show the formula, daily standing charges, unit charges, discounts and total in pounds.
- Compare every input and assumption in the response with your bill, tariff information and meter readings, then correct the prompt and recalculate any mismatch.
- Use the checked result as a range for budgeting, and confirm the actual amount with your supplier if you need to make a payment or dispute a bill.
Prompt
Estimate my future UK household energy bill from the information below. Do not invent missing figures and do not present future prices as known facts. First list any missing inputs. Then calculate the estimate using the exact unit rates and standing charges I provide, showing the electricity and gas calculations separately and stating the billing period. If future rates are uncertain, produce clearly labelled low, central and high scenarios only from assumptions I provide. Include VAT only if the supplied tariff figures say whether it is included. Show the formula, units and total in pounds. Do not give financial advice. End with a short checklist of each figure I must compare against my latest bill or supplier tariff before relying on the estimate. Details: [billing period and dates] [electricity usage in kWh] [gas usage in kWh] [electricity unit rate in pence per kWh] [gas unit rate in pence per kWh] [electricity standing charge in pence per day] [gas standing charge in pence per day] [whether rates include VAT] [any fixed discounts or credits] [any known tariff change date or future rate assumption].
Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.
Hand it to a person
The distant thirdA person who owns the outcome does this end to end, worth it when the failure is dear.
What it gets wrong
- AI cannot know your future usage unless you supply a reasonable assumption based on your household and past readings.
- AI cannot guarantee future unit rates, standing charges, price-cap changes or supplier-specific adjustments.
- AI cannot access your private supplier account or detect billing errors without the relevant bill and account information.
- AI cannot turn an estimate into the amount your supplier will actually collect.
Even on a YES, the friction has a name: real time truth and context depth.
How we scored this
Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.
| Axis | Score (0–2) |
|---|---|
| Output | 2 |
| Inputs | 1 |
| Verification | 2 |
| Liability | 2 |
| Effort delta | 2 |
| Total | 9 / 10 |
The methodology and its thresholds are published in full.
FAQ
- Can ChatGPT calculate my energy bill?
- Yes. Give it your electricity and gas usage, unit rates, standing charges, billing period and discounts, and it can show the calculation. Check every input against your latest bill because a wrong rate or estimated meter reading changes the result.
- Can AI predict how much my energy bill will be next month?
- It can produce a scenario estimate from your past usage and the tariff assumptions you provide. It cannot know your exact future usage or guarantee future supplier rates, so use a range rather than one certain figure.
- What information do I need to estimate my energy bill?
- Gather your billing period, electricity and gas usage in kWh, unit rates, standing charges, discounts and VAT treatment. Current meter readings and their dates help you replace estimated readings with a more useful calculation.
- Is an AI energy bill estimate accurate?
- It can be accurate arithmetic when the supplied figures are correct and the tariff assumptions match your account. It is not a guaranteed bill because usage, rates, meter readings and supplier adjustments can differ from the estimate.
Nearby answers
- Can AI check whether my insurance covers this situation?PARTLY
- Can AI compare broadband deals in my area?PARTLY
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- Can AI compare mobile phone contracts in the UK?YES
- Can AI compare energy tariffs in the UK?PARTLY
Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.
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