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UK Energy Bill Calculator (Price Cap)

Estimates a yearly and monthly UK gas and electricity bill from your kWh at the Ofgem price cap for October to December 2026, standing charges included.

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In short At the Ofgem price cap for 1 October to 31 December 2026, paying by Direct Debit, electricity costs 26.32p per kWh plus 54.83p a day and gas costs 7.97p per kWh plus 29.68p a day. Ofgem’s typical household uses 2,500 kWh of electricity and 9,500 kWh of gas a year, the figures it has used since 1 July 2026, and at these rates that comes to about £1,724 a year, or £143.63 a month — Ofgem quotes £1,723 because it works from unrounded rates. Standing charges are £308.46 of that, about 18%, paid before you use anything. The cap limits the unit rate and standing charge, not your total bill, and rates differ by region and by how you pay, so enter the rates on your own bill for a closer figure. Electricity carries no VAT from 1 October 2026 to 31 March 2027; the gas rates include 5% VAT.

How to use the UK Energy Bill Calculator (Price Cap)

  1. Enter your yearly electricity and gas use in kWh, from your annual statement or your supplier’s app.
  2. Leave the rates at the price cap, or replace them with the rates on your bill.
  3. Tick “No gas supply” if your home is electricity only.
  4. Read the yearly and monthly totals and how much of the bill is standing charges.

About the UK Energy Bill Calculator (Price Cap)

The UK Energy Bill Calculator estimates your gas and electricity bill from what you use, at the Ofgem price cap or at your own tariff’s rates, and shows how much of it is standing charges.

The rates it starts with

The defaults are Ofgem’s average price-cap rates for people paying by Direct Debit in England, Scotland and Wales from 1 October to 31 December 2026: electricity 26.32p per kWh and 54.83p a day, gas 7.97p per kWh and 29.68p a day. Ofgem resets the cap every three months, so the page states the period and the date the rates were checked.

Typical use

Ofgem’s typical domestic consumption values, used for its headline figures since 1 July 2026, are 2,500 kWh of electricity and 9,500 kWh of gas a year. Before that they were 2,700 kWh and 11,500 kWh, which is why older articles quote higher “typical” bills at similar rates.

Where this tool stops

It holds today’s rates for a whole year, while the cap changes every quarter and winter use is higher than summer use. It does not cover Economy 7 or other multi-rate tariffs, Northern Ireland, prepayment rates or fixed deals. Our price cap guide explains the cap in full.

Explained in our guides

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Frequently asked questions

What is the energy price cap from October 2026?
From 1 October to 31 December 2026, by Direct Debit: electricity 26.32p per kWh with a 54.83p daily standing charge, and gas 7.97p per kWh with a 29.68p daily standing charge. Ofgem puts a typical bill at £1,723 a year.
How much energy does a typical UK home use?
Ofgem’s typical figures, used since 1 July 2026, are 2,500 kWh of electricity and 9,500 kWh of gas a year. Your annual statement shows your own.
How much are standing charges a year?
At the October to December 2026 cap, £200.13 for electricity and £108.33 for gas, so £308.46 a year for a home with both.
Does the price cap limit my total bill?
No. It limits the unit rate and the standing charge. The more energy you use, the more you pay.
Do I need an account to use the UK Energy Bill Calculator (Price Cap)?
There is no cost and no cap. The UK Energy Bill Calculator (Price Cap) is not a demo of a paid product, so nothing is held back or watermarked.
Is the UK Energy Bill Calculator (Price Cap) safe to use with private information?
No. The UK Energy Bill Calculator (Price Cap) runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What formula does the UK Energy Bill Calculator (Price Cap) use?
It uses Yearly bill = kWh × unit rate + 365 × standing charge, for each fuel. The full working is printed under the result, so you can follow every step rather than trusting a black box.
When would I actually need the UK Energy Bill Calculator (Price Cap)?
Typical uses: estimating a yearly energy bill from your annual statement. Checking what share of a bill is standing charges. Comparing a fixed-deal quote against the price cap. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
What do people usually get wrong here?
Price-cap rates for 1 October to 31 December 2026, checked against Ofgem on 16 October 2026. Rates vary by region and payment method, and the cap changes every three months.
What are the key numbers for the UK Energy Bill Calculator (Price Cap)?
Electricity (Oct–Dec 2026) is 26.32p/kWh + 54.83p/day. Gas (Oct–Dec 2026) is 7.97p/kWh + 29.68p/day. Ofgem typical use is 2,500 kWh electricity, 9,500 kWh gas. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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