Gas Bill Calculator UK 2026
This gas bill calculator estimates your annual and monthly gas cost from your household size, using the Ofgem Q3 2026 price-cap gas unit rate of 7.33p/kWh and a 29.04p daily standing charge. Use the gas bill calculator below, then see how gas costs are worked out and how to cut them.
How your gas bill is worked out
Your meter records gas in cubic metres (m³); your supplier converts that to kilowatt-hours (roughly ×11.2) and charges a unit rate per kWh plus a daily standing charge. Annual cost = (kWh × 7.33p) + (365 × 29.04p) at the Q3 2026 cap.
Gas is the larger part of most energy bills because it powers heating and hot water. The next cap is expected by 26 August 2026.
How much does gas cost in the UK in 2026?
Under the Ofgem price cap for Q3 2026 (1 July to 30 September 2026), gas is capped at 7.33p per kWh plus a 29.04p daily standing charge on a typical Direct Debit tariff. For a typical medium home using about 11,500 kWh of gas a year, that adds up to roughly £949 a year — around £79 a month. This gas bill calculator uses those official rates, so the figure you see reflects the cap that actually applies to your bill today.
Gas is the main heating fuel in around 85% of UK homes, so for most households it is the single largest energy cost in winter and close to nothing in summer. The unit rate rose sharply from 5.74p per kWh in the April to June cap, a reminder that the gas unit rate can move a long way from one quarter to the next as wholesale markets shift. The cap is set by Ofgem every three months.
The price cap limits the rates a supplier can charge, not your total bill — a bigger or colder home simply uses more kWh and pays more. Gas is only one of five household bills, so to see it alongside electricity, water, council tax and broadband, use the household bills calculator, or estimate your energy together with the gas and electric bill calculator.
If you only want to sanity-check the pence-per-kWh maths, the gas rate calculator converts a meter reading straight into a cost, while the electricity bill calculator does the same for power. For help if you are struggling to pay, see the government’s energy bills support guidance.
How gas is billed: converting m³ to kWh
Here is the quirk that confuses most people: your gas meter measures volume (cubic metres, m³, or on older meters hundreds of cubic feet, ft³), but your supplier charges you for energy in kWh. Every gas bill therefore converts the volume you used into kilowatt-hours before applying the 7.33p gas unit rate.
The standard conversion from cubic metres to kWh is:
kWh = m³ × 1.02264 × 39.5 ÷ 3.6
- 1.02264 — the volume correction factor, adjusting for temperature and pressure.
- 39.5 — the calorific value in MJ/m³ (how much energy the gas contains; it varies slightly and appears on your bill, but 39.5 is typical).
- 3.6 — the number of megajoules in one kWh.
Put together, one cubic metre of gas equals about 11.22 kWh. If your meter reads in imperial units (hundreds of cubic feet), first multiply the units used by 2.83 to convert to cubic metres, then apply the same formula.
Worked example
Say your gas meter advances by 100 m³ over a month. Multiply by the conversion factor: 100 × 1.02264 × 39.5 ÷ 3.6 = about 1,122 kWh. At 7.33p per kWh that is roughly £82.25 of gas, plus the standing charge of 29.04p a day (about £8.71 for a 30-day month) — a total of around £90.96 for the month. Taking a reading at the start and end of a period (at least 28 days apart) gives the most accurate result and avoids estimated bills.
Typical gas usage and cost by property size
The table below shows typical annual gas use in kWh for each property type, with the estimated bill at the Q3 2026 cap (7.33p per kWh plus the 29.04p daily standing charge). These are Ofgem-style benchmark usage figures — your own consumption depends on insulation, thermostat settings and how many people are home during the day — but they are a good starting point before you refine the estimate with your own kWh in the calculator above.
| Property | Occupants | Gas use (kWh/yr) | Annual bill | Monthly |
|---|---|---|---|---|
| 1-bed flat | 1 | 7,500 | £656 | £55 |
| 2-bed flat | 2 | 9,000 | £766 | £64 |
| 2-bed house | 2 | 10,000 | £839 | £70 |
| 3-bed house | 3 | 11,500 | £949 | £79 |
| 4-bed house | 4 | 14,000 | £1,132 | £94 |
| 5+ bed house | 5+ | 17,000 | £1,352 | £113 |
Source: Ofgem price cap, Q3 2026 (current TDCV basis)
Notice how much of every bill is the same regardless of size: the standing charge alone is £106 a year for all of them. That fixed cost is why small, low-use homes still pay well over £100 a year even before they burn a single unit of gas.
Gas standing charges and how they vary by region
The standing charge is the fixed daily fee for being connected to the gas network — 29.04p a day, or about £106 a year — charged whether or not you use any gas. It covers the cost of maintaining pipes and meters and keeping the network running. You pay it every day of the year, including summer months when the boiler is off, which is why a household that barely uses gas can still receive a meaningful bill.
Both the gas unit rate and the standing charge vary slightly by region, because network costs differ across the country. The national average is 7.33p per kWh and 29.04p a day, but the regional cap tables below show the spread. The only way to remove the standing charge completely is to disconnect from gas — for example by switching to an all-electric or heat-pump home, which you can model against your other costs with the gas and electric bill calculator.
| Region | Gas unit rate (p/kWh) | Standing charge (p/day) |
|---|---|---|
| London | 7.50p | 29.52p |
| South East | 7.39p | 28.63p |
| Eastern | 7.26p | 28.70p |
| Southern | 7.53p | 28.53p |
| South Wales | 7.42p | 29.30p |
| South West | 7.48p | 28.68p |
| West Midlands | 7.27p | 29.06p |
| East Midlands | 7.19p | 28.78p |
| Yorkshire | 7.27p | 29.12p |
| North Wales & Merseyside | 7.28p | 29.42p |
| North West | 7.24p | 29.17p |
| Northern | 7.28p | 29.15p |
| North Scotland | 7.23p | 29.22p |
| South Scotland | 7.23p | 29.24p |
| GB average | 7.33p | 29.04p |
Source: Ofgem regional price cap tables, 1 July–30 September 2026 (Direct Debit, incl. VAT)
Fixed vs variable gas tariffs
Once you know your rates, the next decision is whether to stay on a variable tariff or fix. A variable (standard) tariff tracks the Ofgem price cap: your gas unit rate and standing charge change each quarter as the cap moves, so you always pay the current capped rate with no commitment and no exit fees. When the cap falls, your bill falls automatically.
A fixed tariff locks your unit rate and standing charge for a set term — usually 12 months — in exchange for giving up that flexibility. Fixing gives you budget certainty and protects you if wholesale prices climb, but you may pay a small premium up front and you will not benefit if the cap later drops. As a rule of thumb, if a fix is priced at or below the current cap and you value predictable bills, it is often worth taking; if you would rather keep the freedom to switch, the capped variable tariff is a safe default.
Whichever you choose, the way you pay matters. Paying by monthly direct debit attracts the cheapest capped rate. Standard credit (paying on receipt of the bill) costs more, while prepayment is now broadly in line with direct debit after Ofgem removed the old prepayment penalty. For impartial help comparing tariffs and understanding your rights, see Citizens Advice.
How to save on gas and heating
Because the vast majority of household gas is burned on heating and hot water, the biggest savings come from using less heat and keeping it in the home. The most cost-effective steps, based on Energy Saving Trust guidance, are behavioural and insulation measures that pay for themselves quickly.
- Turn the thermostat down 1°C (21° to 20°C) — around £90 a year for a typical home.
- Fit a smart thermostat or upgrade heating controls — roughly £100 or more a year.
- Install thermostatic radiator valves so you only heat rooms you use — about £35 a year.
- Cavity wall insulation — around £240 a year; loft insulation top-up saves more still.
- Replace an old boiler with a modern condensing model — roughly £220 a year.
- Take regular meter readings so bills are accurate rather than estimated.
Larger measures need more up-front spend but change the picture entirely. An air source heat pump can replace gas heating altogether, and the government’s Boiler Upgrade Scheme offers a grant of up to £7,500 towards the cost. Because heating also uses hot water, cutting water use lowers two bills at once — check the knock-on effect with the water bill calculator. And since energy sits alongside your fixed household costs, it is worth reviewing it next to your council tax calculator figure when you budget for the year.
Finally, check whether you qualify for support. The Warm Home Discount gives eligible households £150 off, Winter Fuel Payments help older people, and suppliers must offer priority services and payment plans to those struggling. The government’s get help with energy bills pages list every current scheme.
Gas bill calculator: frequently asked questions
Everything you need to know about UK gas rates, converting m³ meter readings to kWh, standing charges, and how to pay less on your gas bill in 2026.