Fuel Cost Calculator
How much fuel a trip will use and what it will cost: distance, consumption in litres per 100 km or miles per gallon, the price at the pump, an optional round trip and a per-person split for shared rides.
Your numbers
In your local currency.
Result
How it works
The arithmetic is deliberately plain: distance × consumption ÷ 100 gives litres in the metric version, and cost is litres × pump price. The imperial version converts your kilometres to miles, divides by your mpg to get gallons, and converts gallons back to litres so the price — which is almost always per litre now — still works.
The honest weakness is the consumption figure. The number on the brochure was measured on a test cycle; real cars use 10–25% more depending on speed, load, roof boxes, air conditioning and how much of the trip is urban. If your car shows its own long-term average, use that and the estimate becomes genuinely useful for budgeting.
Good practice & limits
- Motorway speed is the biggest lever: air resistance rises with the square of speed, and 130 km/h can cost 20% more fuel than 110.
- Split costs on the per-person figure before the trip, not after — it prevents the traditional petrol-station silence.
- Add 10% to the estimate for winter, roof boxes or a full boot.