Enter the distance for the whole trip
Use the total miles you expect this one vehicle to travel. For a round trip, add the outbound and return distances before entering the number. Include local driving between accommodation, attractions, and restaurants when it belongs in your shared budget. The calculator does not double your distance automatically, look up a route, or add a traffic allowance.
This US version uses miles, miles per US gallon, and US dollars per US gallon. Imperial gallons are different, so do not combine an Imperial mpg figure with a price per US gallon. The tool does not convert currencies or look up a current gas price. Use one consistent fuel economy and price assumption for the vehicle. Calculate different vehicles or substantially different route segments separately.
How fuel and total costs are calculated
- Estimated fuel used in US gallons = total miles ÷ US mpg.
- Estimated fuel cost = estimated US gallons × your price in USD per US gallon.
- Total trip cost = fuel cost rounded once to cents for the whole trip + total tolls + total parking + other shared costs.
The fuel quantity displayed on screen is shortened for readability. The calculation uses the input values before that display rounding. Fuel cost is rounded to the nearest cent once after calculating the entire trip; an exact half cent rounds up. It is not rounded separately per mile, day, or traveler. Adding separately rounded segment estimates may therefore differ slightly from calculating one combined trip.
Add each extra cost once
Tolls, parking, and other costs are totals for the entire trip. Blank optional fields mean $0.00. If a parking charge is quoted per day, add the days yourself before entering it. If a toll is charged in both directions, include both charges. These fields are not multiplied by the traveler count or the number of days; each is added once to the fuel estimate.
You can include agreed accommodation or admission costs in the other-cost field when everyone shares them equally. Check that an expense has not already been included in another field. The calculator does not automatically estimate depreciation, insurance, maintenance, driver compensation, or a reimbursement rate. It also does not record who has already paid, so the result is a budget split rather than a list of transfers between people.
Split every cent without losing the total
Choose from 1 to 20 people and agree whether that count includes the driver. Everyone has an equal share. The calculator first divides the total number of cents into whole-cent shares, then assigns one extra cent to as many people as needed to preserve the total. You choose which people pay that extra cent; no names or payment history are stored in this calculator.
For example, a $100.00 total divided among three people means two people pay $33.33 each and one person pays $33.34. The sum is exactly $100.00. Displaying $33.33 for everyone would leave a cent unpaid. With one person, that person pays the full total. A deliberate zero-cost scenario is also valid and shows a zero share for everyone.
A worked US example
Suppose the complete route is 300 miles, fuel economy is 25 US mpg, and your gas price assumption is $3.50 per US gallon. Estimated fuel use is 12 US gallons and fuel cost is $42.00. Add $10.00 in tolls and $3.00 for parking: the total is $55.00. Four people then pay $13.75 each. These numbers explain the arithmetic; they are not a current price, a route quote, or a claim about a particular car.
Distance, fuel economy, and fuel price accept up to six decimal places. Distance ranges from 0 to 10,000,000 miles, fuel economy must be above 0 and no more than 1,000,000 US mpg, and the price ranges from $0 to $1,000,000,000 per US gallon. Extra costs accept up to two decimal places. The final total is limited to $10,000,000,000.00. Required fields cannot be blank, negative values are not supported, and the people count must be a whole number.
An estimate, not a fuel-stop plan
Actual fuel consumption can differ because of traffic, weather, loading, speed, and the vehicle's condition. This is a budget based on the constant fuel economy you enter, not a measurement of consumption or a prediction of whether the car can reach its destination. It does not recommend a gas station, decide when to refuel, or assess driving safety.
Estimated gallons used are not necessarily the gallons you need to buy now, because the tool does not know how much fuel is already in the tank. A shared link includes the entered assumptions and costs, but those values do not update when pump prices change. Review your inputs before traveling and replace estimates with actual amounts when you settle the trip afterward.
Frequently asked questions
Should I enter one-way or round-trip miles?
Enter all miles for the whole trip. For a round trip, add outbound and return miles, plus local driving. The calculator does not double the distance automatically.
Are optional costs per person?
No. Enter the whole-trip tolls, parking, and other costs. Each is added once, and a blank optional field means $0.00.
How are leftover cents shared?
The total is divided into whole-cent shares. The remaining cents are covered by that many people paying one extra cent. The displayed amounts and counts always add up to the total.
Does the tool look up gas prices or fuel economy?
No. It uses the price and US mpg you enter for the whole trip. It does not measure actual consumption, tell you how much fuel to buy now, or assess driving safety.