As of 13 August 2026, AI can estimate the cost of your road trip.

What to actually do

1. Use a tool built for this

   The route this page recommends

2. Do it yourself

   Second choice

   A chat interface, chat-fluent skill, and roughly 30 minutes until you can act on the result.

   How to actually do it

   1. Open a map or route planner and record the planned UK stops, route distance and driving time, including any ferry crossings or major diversions.
   2. Gather your vehicle fuel or charging type, real-world efficiency figure, the fuel or charging price you want to use, and the number of travellers.
   3. Collect confirmed prices or links for accommodation, ferries, tolls, parking, permits, activities and any bookings you already intend to make.
   4. Paste the prompt and your gathered details into ChatGPT, Claude or Gemini, then ask it to calculate the estimate without filling gaps by guesswork.
   5. Compare the drafted route distance and travel time with your map, and compare each current price with the relevant hotel, operator, car park or official road-charge page.
   6. Paste corrected figures back into the chat and ask for a final itemised total, a per-person split and a list of costs still excluded or unverified.
   7. Save the final estimate with its assumptions, then update it before booking if the route, vehicle, dates or supplier prices change.

   Prompt

   Estimate the cost of my UK road trip using only the information below and clearly label every assumption. Do not invent prices, distances or vehicle details. If a figure is missing, ask for it or show it as an unpriced item rather than guessing.
   
   Starting point: [town or postcode]
   Destinations and stops, in order: [list]
   Travel dates: [dates]
   Vehicle type and fuel: [petrol, diesel, hybrid or electric]
   Vehicle fuel efficiency: [miles per gallon, miles per kilowatt-hour, or other known figure]
   Fuel or charging price to use: [price and source, or ask me to provide one]
   Travellers: [number of adults and children]
   Accommodation: [nights, locations and prices if known]
   Tolls, ferries, parking and permits: [known costs or links]
   Food budget: [per day or total]
   Activities and other planned costs: [list and prices if known]
   Contingency or spending buffer: [amount or percentage, if I choose one]
   
   First, list any missing information that materially affects the estimate. Then produce:
   1. A route summary with total driving distance and time, stating the source or marking it as needing verification.
   2. Fuel or charging calculations showing the formula and assumptions.
   3. An itemised table for fuel or charging, accommodation, tolls, ferries, parking, food, activities and other costs.
   4. Low, expected and high totals only where the difference is based on explicit assumptions or supplied price ranges.
   5. A per-person figure if the travellers split the cost, stating exactly what is included.
   6. A checklist of every figure I must verify before relying on the budget, including current supplier prices, road charges and whether prices include taxes or booking fees.
   Do not present the estimate as a quotation, booking confirmation or guarantee.

   Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.

3. Hand it to a person

   The distant third

   A person who owns the outcome does this end to end, worth it when the failure is dear.