UK Fuel Cost Trip Calculator

Estimate journey fuel cost, travel time, and CO₂ by postcode. Convert MPG to litres, compare petrol, diesel, and EV rates, and split fuel money with passengers.

⏱️ 2-3 minutes
💪 Short

Fuel Cost Trip Calculator

Estimate fuel cost, journey time and CO₂ for any UK route

Optional: Vehicle Lookup

Enter your registration to auto-fill fuel type and efficiency.

Ready to calculate your trip?

Enter your postcodes and vehicle details to see cost, time, emissions, and a simple fuel comparison.

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How This Tool Works

This tool calculates journey running costs across the UK using official road fuel averages, benchmark EV charging rates, and vehicle MPG/MPGe efficiencies. It applies standard fuel cost per mile formulas, provides passenger cost splitting, and compares petrol, diesel, and electric options.

  1. 1
    Enter your UK start and end postcodes to calculate route distance.
  2. 2
    Choose petrol, diesel, or electric and enter your vehicle MPG / MPGe.
  3. 3
    Optionally override with manual odometer or satnav mileage.
  4. 4
    Calculate estimated trip fuel cost, emissions, and split cost per person.
  5. 5
    Compare side-by-side costs across petrol, diesel, and home/public EV charging.

Complete Guide

Quick Tips

Jump-start your understanding with these essential tips

If distance doubles, fuel cost and emissions are usually close to double too. Before changing fuel type or over-optimising efficiency assumptions, make sure your miles are realistic.

Vehicle efficiency has a big impact. If you know your real MPG or MPGe from recent journeys, use that instead of manufacturer brochure figures.

If your satnav or route planner already gave you exact route miles, enter them directly to reflect your exact roads and diversions.

EV journey costs vary widely depending on whether you charge on overnight home electricity rates (~7-9p/kWh) or rapid motorway chargers (~70-85p/kWh).

Step-by-Step Guide

Follow these steps to get the most from this tool

Start with full UK postcodes for both ends of the journey. The tool resolves location coordinates using Postcodes.io to estimate distance and journey duration accurately.

Select petrol, diesel, or electric. Enter your real-world MPG (or MPGe for EV) to reflect your actual vehicle consumption.

The calculator computes your trip total and displays a side-by-side comparison across petrol, diesel, and EV, alongside carbon emissions.

Use the passenger split settings to divide the total journey cost fairly for carpools and group road trips.

Advanced Topics

Deep dives for advanced users

To master how to calculate fuel cost per mile UK wide, we use the standard unleaded and diesel cost per mile formula:

Cost per mile (p) = Fuel Price per Litre (p) ÷ (MPG × 0.2199)

The 0.2199 coefficient converts Imperial miles-per-gallon to miles-per-litre (1 Imperial gallon = 4.54609 litres). For example, if petrol costs 148p/litre and your car delivers 45 MPG:

148p ÷ (45 × 0.2199) = 148p ÷ 9.8955 = 14.95p per mile

This petrol price per mile UK benchmark is essential for tracking driving expenses, budgeting annual commutes, or operating a fair split petrol money calculator with passengers. Unlike generic journey planners like the RAC fuel cost calculator journey tool, our calculator lets you adjust vehicle efficiency and compare EV alternatives.

We track UK road fuel prices using published data aligned with the gov.uk Fuel Finder Public API and official Department for Energy Security and Net Zero road fuel datasets. These benchmarks reflect weekly national averages across major supermarket and oil company forecourts (Tesco, Asda, Sainsbury's, Morrisons, BP, Shell, Esso).

There is an important distinction between actual trip fuel costs and HMRC approved mileage allowance payments AMAP. HMRC allows tax-free business mileage claims at 45p/mile (for the first 10,000 business miles) and 25p/mile thereafter. AMAP covers depreciation, road tax, MOT, and insurance in addition to fuel, whereas this tool isolates pure mechanical fuel spend.

Frequently Asked Questions

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Reviewed by Asad Mujtaba• Methodology reviewed: August 2026•Tool outputs can refresh continuously from live APIs where available.

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We may earn a commission on purchases at no extra cost to you. While we only partner with trusted platforms through reputable affiliate networks, all services and accounts are managed directly by the provider, who will handle any customer care or account needs.