Check a billUK Energy Bill Calculators
This hub is for calculation-led intent. Pick the calculator that matches the number you are trying to challenge: direct debit, usage cost, standing charge, bill from readings or price cap rates.
Choose the right calculator
Direct debit check
Sense-check whether your supplier’s proposed monthly payment is reasonable.
Open calculatorChallenge templatekWh and bill cost
Turn kWh, p/kWh and standing charges into an estimated bill subtotal.
kWh calculatorBill from readingsRates and standing charges
Use the right region, payment method and standing charge before challenging a bill.
Regional ratesStanding charge calculatorCalculator plus action
| If your result suggests | Do this next | Relevant page |
|---|---|---|
| Direct debit looks too high | Ask for forecast, balance, buffer and review period | /direct-debit-increase-complaint-template/ |
| kWh subtotal does not match bill | Check rates, dates, VAT and standing charge | /energy-bill-dispute/ |
| Standing charge dominates a low-usage bill | Confirm daily rate and days billed | /standing-charge-too-high-uk/ |
| Meter reading bill seems wrong | Send reading evidence and ask for rebill | /wrong-meter-reading-complaint-template/ |
Frequently asked questions
Which calculator should I use first?
Start with the problem: direct debit amount, kWh cost, standing charge, meter reading or price cap rate.
Can a calculator prove the supplier is wrong?
No. It creates a sense-check and helps you ask for the right breakdown.
Should I use national average rates?
Use your bill or official regional rates whenever possible.
Official sources used for this page
BillDecoded translates official process and billing information into practical checks. It is not affiliated with the Ombudsman, Ofgem, Citizens Advice, Which? or any supplier.