Road Trip Gas Splitter

Estimate the fuel bill and see how much everyone should chip in for your road trip.

Your inputs stay in your browser. Trip details are never uploaded.

Trip and vehicle
Trip type
Split the cost
Advanced shared costs and vehicles
Other shared costs
$
$
$

More than one vehicle?

Add each vehicle's miles driven, fuel economy, and fuel price. Costs are pooled.

Custom shares

Use 0 for someone who pays nothing, 1 for a full share, or 0.5 for a half share.

Your road-trip split

Estimated shared cost:

Total miles
Estimated gallons
Gas only
Other shared costs
Total shared cost
Amount per paying traveler

Traveler amounts

    This is an estimate. Actual fuel consumption can differ from rated or expected MPG or L/100 km.

    How to split road-trip gas fairly

    Start with the fuel the trip is expected to use, then multiply by the pump price. Add costs everyone agreed to share, such as tolls and parking. An equal split is simple when everyone travels the whole route. If the driver is contributing their car and driving time, the group may instead have only passengers pay. Custom shares can account for someone joining for only part of the trip.

    Formula used

    For US units: gallons = total miles ÷ MPG, then fuel cost = gallons × price per gallon. For metric units: liters = kilometers × L/100 km ÷ 100, then fuel cost = liters × price per liter. Round trip doubles each vehicle's entered one-way distance.

    Fuel-economy ratings are estimates. Traffic, speed, hills, weather, idling, cargo, tire pressure, and driving style can change real consumption.

    Frequently Asked Questions

    Estimate fuel cost from trip distance, fuel economy, and fuel price, add any shared costs, then divide by the agreed number of paying travelers or shares.

    There is no single rule. Groups can split equally including the driver, let passengers cover the driver, or assign custom shares based on participation.

    It multiplies kilometers by liters per 100 kilometers and divides by 100. This is different from the miles-divided-by-MPG formula.

    Traffic, speed, terrain, weather, idling, vehicle load, driving style, and actual pump prices can all change fuel use and cost.

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