RealCost Tool
Trip Fuel Cost Planner UK
Before you set off, it helps to know how much the journey is likely to cost in petrol or diesel.
Use this UK trip fuel cost planner to estimate fuel cost for a specific journey, including distance, fuel price, MPG, traffic conditions, one-way trips, return trips and shared fuel costs.
Plan a journey cost
Estimate how much fuel a specific trip could cost before you travel.
One-way or return
Calculate the fuel cost for a single trip or a full return journey.
Split fuel costs
Useful for day trips, lifts, airport runs and journeys shared with friends or family.
Calculate your trip fuel cost
Enter your journey distance, fuel price, vehicle MPG, traffic conditions and journey type to estimate total fuel cost, fuel used and shared trip costs.
This calculator estimates fuel cost only. Actual fuel cost can vary depending on driving style, traffic, route, weather, vehicle load and real-world MPG.
Trip fuel cost is not the full journey cost
This planner estimates petrol or diesel cost only. Parking, tolls, congestion charges, clean-air charges, tyre wear, maintenance, insurance and depreciation may also affect the real cost of driving.
RealCost note: Use this planner for specific journeys. For ongoing yearly fuel spend, use the Fuel Cost Per Mile Calculator UK. For a quick known-distance estimate, use the Fuel Cost Calculator UK.
What the planner includes
The calculator uses journey distance, fuel price, MPG, traffic and journey type to estimate the fuel cost of a trip.
Distance
Enter the journey distance in miles. Use the one-way distance if you choose the return option.
Fuel price per litre
Enter the petrol or diesel price per litre you expect to pay.
Vehicle MPG
Enter your car’s MPG. Use a realistic real-world figure if possible.
Traffic conditions
Choose light, normal or heavy traffic to adjust the estimate for stop-start driving.
Journey type
Choose whether the journey is one-way or return.
Shared fuel cost
The planner shows the cost split between two people and four people.
What the results tell you
The results show the full journey fuel estimate and how that cost changes when shared.
Total journey distance
The total miles after one-way or return journey is included.
Fuel cost per mile
The estimated fuel cost for each mile, adjusted for traffic conditions.
Fuel used
The estimated litres of fuel used for the full journey.
Total trip fuel cost
The estimated fuel cost for the full trip.
Split between 2 people
Useful if two people are sharing the fuel cost.
Split between 4 people
Useful for group trips, family trips or shared journeys.
Example trip fuel result
This example uses a 100-mile journey, £1.50 per litre, 45 MPG, light traffic and a return trip.
One-way distance
100 miles
Journey type
Return
Fuel price
£1.50/L
Vehicle MPG
45 MPG
Total distance
200 miles
Fuel used
20.20 litres
Trip fuel cost
£30.31
Split between 4
£7.58 each
What this means: A return journey that looks simple can still cost over £30 in fuel, before parking, tolls or other travel costs are included.
Which fuel calculator should you use?
RealCost has different fuel tools for different questions. Use the one that matches your decision.
Trip Fuel Cost Planner
Use this for specific journeys, return trips, traffic and split costs.
Fuel Cost Calculator UK
Use this for a quick known-distance fuel estimate using miles, fuel price and MPG.
Fuel Cost Per Mile Calculator
Use this for ongoing fuel cost per mile, per month and per year.
One-way vs return journey
Use the journey type carefully so you do not undercount the real fuel cost.
One-way journey
- Useful for a single trip
- Good for drop-offs or one-off travel
- Shows the cost of getting there
- Does not include the drive back
Use this if: you only need the cost of one direction.
Return journey
- Includes both directions
- Better for day trips
- Useful for regular return journeys
- Shows the full fuel cost more clearly
Use this if: you are driving there and back.
Why split-cost results are useful
Shared fuel estimates are useful for lifts, day trips, family visits, weekend trips and airport runs.
If a return journey costs £30.00 in fuel:
About £15.00 each
About £7.50 each
What changes trip fuel cost?
The same journey can cost different amounts depending on your car, route and driving conditions.
Stop-start traffic usually increases fuel use, especially in towns and cities.
Motorways, country roads and urban routes can all produce different real MPG.
Hard acceleration, braking and high speeds can make a journey more expensive.
Passengers, luggage, roof boxes or towing can increase fuel use.
Filling up at a cheaper station can change the final trip cost.
Cold weather, wind and rain can reduce real-world efficiency.
Driving vs public transport
Fuel cost is useful when comparing driving with train, coach, bus or taxi costs, but remember to include parking and charges too.
Driving may be better if
- You are travelling with passengers
- The route is awkward by public transport
- You need flexibility
- You are carrying luggage or equipment
Public transport may be better if
- Parking is expensive
- Traffic is heavy
- You are travelling alone
- Train or coach fares are low
When this planner is most useful
Use it when you need the fuel cost of a specific journey, not a general yearly fuel budget.
What to calculate next
Use these tools when the trip fuel result is only part of the wider decision.
Fuel Cost Per Mile Calculator UK
Work out ongoing fuel cost per mile, per month and per year.
Commute Calculator UK
Estimate daily, weekly, monthly and yearly driving-to-work costs.
Should I Drive or Use Public Transport UK?
Compare driving with bus, train, coach or other transport options.
Cheapest Way to Commute UK
Compare driving, public transport, cycling, car sharing and hybrid working.
Related travel guides
Use these guides when a single trip cost is part of a bigger travel decision.
Plan & Compare Travel Costs UK
Explore travel cost tools and guides in one place.
Should I Drive or Use Public Transport UK?
Compare driving with alternative travel options.
How to Reduce Car Running Costs UK
Find practical ways to reduce fuel and ownership costs.