Fuel Cost & Road Trip Cost Calculator
Calculate road trip fuel expenses, total journey costs including tolls, cost per mile or kilometre, and per-passenger group splits.
Trip & Vehicle Parameters
Expense & Consumption Breakdown
Multi-Passenger Cost Split Table
About this tool
How to use it
- Choose your measurement units (US Customary Miles/MPG, Metric km/L per 100km, or UK Imperial Miles/UK MPG) and local currency symbol.
- Enter the trip distance, select One-Way or Round Trip, and input your vehicle's average fuel economy.
- Enter the current fuel price per gallon or litre, plus any highway tolls, parking fees, or vehicle permit costs.
- Set the passenger headcount to generate an equitable per-person expense split table for group road trips.
Why it matters
Estimating road trip travel expenses beforehand eliminates guesswork at the gas pump and prevents awkward post-trip bill splitting between friends. By calculating exact fuel volume, per-mile running cost, and combined toll fees, you can budget accurately and compare driving costs against flight or train fares.
When to use it
Use when planning vacation road trips, budgeting daily work commutes, splitting gas money with carpool passengers, or calculating business driving mileage expense reimbursements.
Good to know
Real-world fuel economy varies with highway cruising speed, aggressive acceleration, cargo weight, roof racks, and tire inflation. Consider adding a 10% fuel buffer for heavy city traffic and detours.
Common questions
How is total trip fuel cost calculated?
For US units, divide total trip distance by your vehicle's MPG rating to get total gallons needed, then multiply by the price per gallon. For metric units, multiply total kilometres by (L/100km / 100) and multiply by the price per litre.
What is the difference between US MPG and UK MPG?
An Imperial gallon in the United Kingdom is 4.546 litres, whereas a US liquid gallon is 3.785 litres (about 20% smaller). Therefore, a vehicle rated at 35 UK MPG achieves approximately 29.1 US MPG for the same amount of fuel.
How should road trip expenses like tolls and parking be split?
Total journey cost is the sum of total fuel expenses, road tolls, and parking tickets. Divide this grand total by the total number of passengers in the vehicle to determine an equal per-person financial contribution.
How much carbon dioxide (CO2) does driving produce?
Burning one US gallon of conventional gasoline produces approximately 8.89 kilograms (19.6 pounds) of CO2 emissions. Burning one litre of petrol emits roughly 2.31 kg of CO2 into the atmosphere.
Does driving faster use significantly more fuel?
Yes. Aerodynamic drag increases with the square of vehicle speed. Driving at 75 mph (120 km/h) uses roughly 15% to 20% more fuel than cruising at 60 mph (97 km/h), noticeably increasing your total road trip fuel expenditure.