Fuel Cost Calculator UK & MPG Calculator | Trip Cost, Cost per Mile

Fuel Cost Calculator UK

Petrol • Diesel • Electric

Fuel Type Petrol Diesel Electric

Calculation Single Trip (one-way) Single Trip (return) Annual (one-way) (distance x 12) Annual (return) (distance x 2 x 12)

Single trip estimate for one-way distance.

Distance (miles)

Enter your one-way distance.

Route Type Mixed (city + motorway) City / Streets Motorway

Route type adjusts consumption and time estimate.

Efficiency Unit (Petrol/Diesel) MPG (UK) Litres / 100km

Electric uses miles per kWh (same input box below).

Fuel Efficiency

Tip: use your car's real-world MPG.

Fuel Price

Example: 145p = 1.45 GBP per litre

£

Estimated Cost (GBP)

£0.00

Trip (one-way)

Required Fuel

0.0

—

Cost per mile

£0.00 / mile

Based on effective distance.

Trip Time (estimate)

0h 0m

Assumes route-based average speed.

Recurring cost (based on per-trip cost)

Weekly (10 trips) £0.00

Monthly (40 trips) £0.00

Yearly (500 trips) £0.00

Petrol/Diesel prices in pence per litre. Electric price in pence per kWh. Uses UK gallon conversion for MPG.

Fuel Cost Calculator (UK): Estimate Trip Fuel Spend in Pounds + Real MPG Calculator

UK fuel prices add up quickly, especially when you’re doing regular commutes or lots of short trips. A reliable fuel cost calculator helps you estimate the real cost of driving before you set off. On this page you’ll find two practical tools: a fuel calculator (trip, return and annual cost) and a separate mpg calculator that works out your real-world MPG from what you spent and how far it took you.

UK-only format: prices are entered in pence (pence per litre / pence per kWh) and results show in £. MPG is based on UK gallons.

Why use a fuel cost calculator in the UK?

A receipt tells you what you paid once. A fuel cost calculator tells you what you’re about to pay for a journey, which makes it easier to budget and avoid surprises. It’s especially useful for:

• Commuting budgets (weekly, monthly and yearly projections)
• Return trips (many people forget the drive back)
• Cost per mile for comparing routes
• Realistic planning across petrol, diesel, and electric driving

How to use the Fuel Cost Calculator

This fuel calculator is designed to give a quick, realistic estimate. Follow these steps:

1. Select fuel type (petrol, diesel, or electric).
2. Choose calculation mode: single trip (one-way), single trip (return), annual (one-way), or annual (return).
3. Enter distance in miles (use one-way distance; the tool handles return trips automatically).
4. Select route type (city, motorway, mixed) to keep the estimate closer to real driving.
5. Enter your efficiency (MPG (UK) or L/100km for petrol/diesel, miles per kWh for electric).
6. Enter the price in UK pump style: petrol/diesel is pence per litre (e.g. 136.02), electric is pence per kWh (e.g. 28).
7. Press Calculate to see the total cost in £, required fuel/energy, and cost per mile.

Quick tip: for best accuracy, use your real-world MPG (what you actually get), not the manufacturer’s brochure figure.

How to use the MPG Calculator (Real MPG from spend)

Many people search for an mpg calculator because dashboard MPG can be optimistic. This version is simple and evidence-based: it uses fuel price, what you spent, and how far you drove. It also works nicely as a mpg price calculator because it shows cost per mile.

1. Enter fuel price as pence per litre (example: 136.02).
2. Enter the amount spent in £ (example: 10).
3. Enter the distance covered in miles (example: 80).
4. Press Calculate MPG to see your real MPG (UK), litres used, UK gallons used, and cost per mile.

Real MPG Calculator (UK)

Fuel price (pence per litre)

UK pump prices are usually shown in pence (e.g. 136.02).

p

Amount spent (£)

Total you paid for the fuel.

£

Distance covered (miles)

How far that fuel actually took you.

mi

MPG (UK)

0.0

Real-world MPG from your spend.

Litres used

0.0 L

Calculated from fuel price + spend.

UK gallons used

0.00

1 UK gallon = 4.546 L

Cost per mile

£0.00

Spend ÷ miles.

Formula: litres = spend ÷ (price(pence)/100) • MPG(UK) = miles ÷ (litres/4.54609)

Miles to pounds MPG: how to think about it

People often search for phrases like miles to pounds mpg because the real question is: “How much will this drive cost me?” The most practical way is to use the tools together:

• Use the fuel cost calculator to forecast the trip cost in pounds.
• Use the mpg calculator to confirm whether your car’s efficiency matches what you expect.

Why this matters: if your real MPG suddenly drops, your cost per mile rises — even if the pump price stays the same.

Tips for more accurate results

• Use a realistic efficiency figure (short trips and stop-start traffic usually reduce MPG).
• Enter prices in pence, not pounds, to match UK pump boards and avoid mistakes.
• For commuting, use return mode and check weekly/monthly totals.
• If results look unusually high, check tyre pressure and consider whether your route has become more “city” than “motorway”.

FAQ

Is this fuel calculator UK-only?

Yes. It’s built around UK usage: GBP, pence per litre, and UK gallons for MPG.

Why are prices entered in pence?

UK stations display fuel prices in pence (for example, 136.02). Entering pence keeps the tool consistent with what drivers see at the pump.

Is the MPG calculator better than dashboard MPG?

It’s more “real-world” because it uses what you actually bought and how far it took you, rather than estimates from onboard sensors.