How to split fuel costs fairly on a carpool

The formula

Add up what the trip actually costs: fuel, tolls and any parking. Then divide by everyone travelling, the driver included. The driver is making the trip anyway, so they pay a share too.

Fuel cost = distance ÷ your car's fuel economy × the fuel price. Use kilometres and km per litre, or miles and miles per gallon. Just keep the units consistent.

Worked example in rupees

• Trip: 150 km. Car: 15 km per litre. Petrol: ₹105 per litre (example price).
• Fuel: 150 ÷ 15 = 10 litres × ₹105 = ₹1,050. Tolls: ₹300. Total: ₹1,350.
• Four people in the car: ₹1,350 ÷ 4 ≈ ₹340 per seat.

Worked example in dollars

• Trip: 200 miles. Car: 30 miles per gallon. Gas: $3.50 per gallon (example price).
• Fuel: 200 ÷ 30 ≈ 6.7 gallons × $3.50 ≈ $23.30. Tolls: $10. Total: $33.30.
• Three people in the car: $33.30 ÷ 3 ≈ $11 per seat.

Tips for a smooth split

• Round to a simple number and put it in the listing, so there's no haggling.
• Say up front whether the price covers tolls and parking.
• Agree how riders will pay, cash or a payment app, before the trip.
• Don't add a profit margin. Cost-sharing keeps you on the right side of insurance and licensing rules in most countries.