Fuel Cost Calculator
Estimate fuel needed and trip cost using MPG or L/100km, with round-trip and passenger cost-splitting options.
Enter distance, fuel economy and fuel price.
Estimated trip fuel cost
How we calculated it
About the Fuel Cost Calculator
Before budgeting a drive, it helps to separate the fuel question from the rest of the trip costs. This calculator estimates how much fuel the journey will use and what that fuel is likely to cost from distance, vehicle economy and pump price.
Real fuel use rarely matches a single rated figure exactly. Traffic, speed, idling, hills, weather, load and driving style can all move actual consumption away from the estimate.
How to Use the Fuel Cost Calculator
- Enter the total driving distance for the trip, including the return journey if the calculation should cover both directions.
- Enter a realistic fuel-economy figure for the vehicle using the correct unit, such as MPG or L/100 km.
- Enter the fuel price in the same currency and volume unit expected by the calculator.
- Calculate the fuel quantity and total cost, then add tolls, parking or other travel expenses separately if you are building a full trip budget.
How the Calculation Works
For MPG-based inputs, fuel used = distance ÷ miles per gallon. Trip fuel cost = fuel used × price per gallon. For L/100 km, fuel used = distance in kilometres × consumption ÷ 100, then cost = litres used × price per litre.
Unit conversions are applied before the arithmetic when distance, economy and fuel-price units differ. Passenger cost splitting divides the trip cost after the total fuel expense has been calculated.
Worked example
Fuel Cost Calculator Worked Example
300-mile trip at 30 MPG
Fuel needed is 300 ÷ 30 = 10 gallons. At $3.50 per gallon, the fuel cost is 10 × $3.50 = $35. If two people split only the fuel expense equally, that is $17.50 each.
Result guide
Understanding Your Fuel Cost Calculator Result
Use the result as a fuel-only estimate unless the page explicitly includes other costs. If two routes have similar distances, differences in traffic or speed can matter as much as the mileage difference.
Before you rely on the answer
Assumptions and Limitations
- The entered fuel economy is representative of the trip.
- The fuel price is an average price for the fuel actually purchased.
- Detours, idling and non-driving trip costs are excluded unless added separately.
Practical tip
Using This Result in Practice
For a long trip, use your vehicle’s recent real-world fuel economy rather than the best number shown on the dashboard. If fuel prices vary significantly along the route, test a higher price as a budget buffer.
Related calculations
Useful Calculations to Continue With
If you do not know your real fuel economy, calculate it from distance and fuel used with the Gas Mileage / MPG Calculator first.
If you are also planning travel duration, use the Speed Distance Time Calculator for a separate time estimate.
Common questions
Fuel Cost Calculator FAQ
Should I use highway MPG or combined MPG?
Use the figure that best matches the route. A mostly motorway trip may be closer to highway economy, while mixed traffic is better represented by a combined or recent real-world figure.
Does the calculator include tolls and parking?
No unless those costs are explicitly entered. The core calculation estimates fuel use and fuel cost.
Why was my actual fuel cost higher?
Lower-than-expected fuel economy, higher pump prices, idling, detours and extra distance can all increase real fuel cost.