Diesel Fuel Prices UK: Live Fuel Cost Calculator

Quick answer: The UK average diesel price is currently around 181 to 182 pence per litre, roughly 18 to 20 pence more than unleaded petrol. Prices change daily, so use the live tracker below rather than relying on a fixed number for budgeting.

Diesel prices in the UK move often, sometimes several times in a single week, so a number printed in an article today can be out of date within days. Rather than quote one fixed figure and hope it stays accurate, this page includes a live tracker below that pulls current prices automatically, so if you check back the numbers reflect what drivers are actually paying at the pump right now.

Live UK diesel and petrol price tracker

This widget is powered by CheckFuelPrices.co.uk, which draws on the UK Government Fuel Finder scheme and CMA retailer feeds. It updates on its own, so you never need to edit this post to keep the numbers current. You can swap in a UK postcode to pull local prices instead of the national average by adding ?postcode=YOURPOSTCODE to the embed link.

Factor	Status
UK diesel vs petrol price	Diesel usually higher
Supermarket vs branded forecourt	Supermarkets typically cheaper
Tax share of pump price	Around half is duty and VAT
Regional variation	Northern Ireland often cheapest
Price update frequency	Live, several times daily

What is the average diesel price in the UK right now?

The UK average diesel price is running at roughly 181 to 182 pence per litre, based on data reported across thousands of forecourts under the Government’s statutory Fuel Finder scheme. Petrol averages around 160 to 162 pence per litre over the same period, which puts diesel about 18 to 20 pence higher per litre than unleaded.

That gap between diesel and petrol has actually narrowed over the past few months. Diesel spiked sharply earlier in the year, driven largely by disruption to oil and gas shipping through the Strait of Hormuz, and peaked at close to 192 pence per litre in mid-April. It has eased back by around 15 to 18 pence since then, though it remains well above where it stood before that disruption began.

Prices also vary a fair amount by nation and region. Northern Ireland tends to run cheapest, often 8 to 10 pence per litre below the South East of England, which usually posts the highest regional average. If you drive regularly across a border region, checking the local breakdown in the tracker above rather than relying on the national figure can make a real difference to your fuel budget.

Which parts of the UK have the cheapest and most expensive diesel?

Northern Ireland consistently has the cheapest diesel in the UK, often 8 to 10 pence per litre below the national average, while the South East of England and Scotland tend to sit at the higher end. That gap alone can be worth £4 to £5 on a single fill up, before even factoring in the difference between individual forecourts.

Part of the reason for Northern Ireland’s lower prices is its proximity to the Republic of Ireland, where cross-border competition and different retail dynamics keep local pricing more competitive. Scotland and the South East, by contrast, often carry higher transport and distribution costs to reach more remote or high-demand areas, which filters through to the pump price.

Wales and the North of England typically land close to the national average, usually within a penny or two either way. If you regularly drive between regions, keeping an eye on these gaps through the live tracker can help you time a fill up for a cheaper leg of a longer journey rather than topping up as soon as the tank runs low.

Why did diesel prices rise so sharply in early 2026?

Diesel prices in the UK rose sharply from late February 2026 because of disruption to oil and gas shipping through the Strait of Hormuz, a narrow waterway that carries roughly a fifth of the world’s energy supply. The conflict in the Middle East that drove this disruption pushed diesel to a peak of close to 192 pence per litre by mid-April.

A ceasefire in early April eased some of the pressure, and shipping through the strait has since recovered to a large extent, with exports from major producers climbing back toward pre-conflict levels. That recovery is a big part of why diesel has fallen back by 15 to 20 pence per litre since its peak, even though it remains above where it stood before the disruption began.

This kind of price swing is a good reminder that diesel costs are shaped as much by international shipping and geopolitics as by anything happening at a UK forecourt. It is also why a live tracker is far more useful than a printed figure when you are budgeting for diesel, since a single news event on the other side of the world can move the price you pay within weeks.

Why is diesel more expensive than petrol in the UK?

Diesel costs more than petrol mainly because it needs a more complex refining process and is a heavier liquid to produce, which pushes up the wholesale cost before it even reaches the forecourt. On top of that, global demand for diesel from hauliers, farms, and industry keeps steady upward pressure on the price.

Tax makes up a large share of what you pay regardless of which fuel you choose. Fuel duty is charged as a flat rate per litre, currently just under 53 pence, and VAT adds 20% on top of the total price including duty. Together, tax accounts for roughly half of what you pay at the pump, so when the wholesale price moves, the retail price moves by a similar amount rather than being cushioned by a large untaxed margin.

Retailer margins add a smaller but still noticeable slice. Regulators have found average margins sit around 8 to 11 pence per litre once duty and VAT are stripped out, and these margins can shift depending on how quickly retailers pass on changes in wholesale cost. Supermarkets tend to run tighter margins than branded forecourts, which is part of why they usually show up cheaper on the tracker above.

International events also feed through to the pump surprisingly quickly. Diesel is heavily traded and shipped globally, so disruption to a major shipping route or a jump in crude oil prices tends to show up in UK pump prices within a couple of weeks. Petrol reacts too, but diesel has historically moved by wider margins during periods of geopolitical disruption, partly because of its heavier reliance on industrial and freight demand that does not ease off the way leisure driving might.

How do you calculate diesel fuel cost for a UK trip?

You calculate diesel fuel cost by dividing the trip distance by your car’s mileage in miles or km per litre, then multiplying by the current diesel price per litre. For a 200 mile trip in a car doing 50 miles per gallon, that works out to roughly 18 litres and, at 182 pence per litre, close to £33 in diesel.

Many UK diesel cars still list mileage in miles per gallon rather than km per litre, so you may need to convert first. One UK gallon equals about 4.546 litres, so a car rated at 50 mpg uses roughly 4.546 divided by 50, or about 0.091 litres per mile. Multiply that by your trip distance to get the litres needed, then multiply by the pump price to get your total cost.

If your car’s spec sheet gives mileage in litres per 100 km instead, the working is slightly different but just as quick. Take the l/100km figure, divide it by 100, and multiply by your trip distance in kilometres to get the litres needed, then multiply by the current price per litre. A car rated at 6 litres per 100 km driving a 320 km round trip would use about 19.2 litres, which at 182 pence per litre comes to roughly £35.

Because the price shown in the tracker updates live, it is worth checking it again just before a longer trip rather than working from a figure you saw a week earlier. A swing of even 5 pence per litre adds close to £2.75 to a 55 litre fill, which starts to matter on a long motorway trip or a regular commute.

How much does a full tank of diesel cost right now?

A full tank of diesel at the current UK average of around 182 pence per litre costs roughly £100 for a typical 55 litre car tank. Larger vans and SUVs with 70 to 80 litre tanks can expect to pay closer to £127 to £145 for a complete fill at that price.

This figure moves with the price shown in the tracker above, so it is worth treating it as a rough guide rather than a fixed cost. During the diesel spike in April, when prices touched close to 192 pence per litre, that same 55 litre tank would have cost over £105. As prices eased through May and June, the same fill dropped closer to £97, showing just how much a swing of 15 to 20 pence per litre changes the total cost of running a diesel vehicle.

For regular commuters or anyone running a diesel van for work, this kind of swing adds up quickly across a month of fill ups. Checking the live tracker before topping up, and comparing a nearby supermarket forecourt against your usual branded station, is one of the simplest ways to keep that monthly fuel bill under control without changing how or where you drive.

Fleet operators and small business owners running several diesel vehicles often find it worth tracking this figure weekly rather than daily, since the UK Government’s own weekly road fuel price statistics tend to smooth out the noisier day-to-day swings seen on individual forecourt reports. That weekly view can be a steadier basis for budgeting fuel costs across a fleet than chasing the lowest price on any single day.

How do you add a self-updating fuel price tracker to a WordPress post?

You add a self-updating fuel price tracker by pasting an embed code from a live data provider into a Custom HTML block in the WordPress editor. Because the widget pulls from the provider’s servers each time the page loads, the prices stay current without you ever editing the post again.

1. Open the post in the WordPress block editor and click the plus icon where you want the tracker to appear.
2. Search for and add a Custom HTML block.
3. Paste the iframe embed code for the fuel price widget into the block.
4. Preview the post to confirm the widget loads and displays current prices.
5. Publish. The widget will keep refreshing itself on the provider’s schedule, so the post never goes stale on pricing.

FAQ

Will diesel prices keep falling in the UK?

Nobody can say for certain, since diesel prices depend on global oil supply and shipping conditions that shift quickly. Diesel has already eased back well off its April peak, but it remains above where it stood before disruption to Middle East shipping routes began.

Is diesel cheaper at supermarkets than at branded forecourts?

Yes, supermarket forecourts typically price diesel a few pence per litre below branded stations. On a 55 litre fill, that gap can save close to £3, though it is worth weighing any detour against the saving.

Does the live tracker on this page cost anything to use?

No, the tracker embedded on this page is free to view and does not require any sign up or payment. It simply reflects live data from the provider’s fuel price feed.

Why does diesel cost more per litre than petrol even though both are taxed the same?

Fuel duty is charged at the same flat rate per litre for both fuels, so the price gap comes from the underlying wholesale cost. Diesel needs a more complex refining process and tends to see stronger global demand from freight and industry, which keeps its base price higher before tax is even applied.

References

1. Local Prices, “UK Petrol Prices Today” (2026)
2. Pennr, “Petrol & Diesel Prices UK Today — Live Averages” (2026)
3. Brumble, “Are Petrol Prices Going Up? Updated August 2026” (2026)
4. PetrolPrices.co.uk, “UK Fuel Price Index” (2026)
5. RAC Drive, “Latest UK petrol and diesel prices” (2026)

Image Suggestions

1. A flat illustration of a UK fuel pump nozzle with a small live price tag graphic beside it, no brand logos.
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3. An illustration of a supermarket forecourt sign versus a branded forecourt sign side by side, generic and unbranded.
4. A simple line chart illustration showing a price trend rising then falling, styled as a clean flat graphic.
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