Fuel Cost Calculator
Calculate fuel cost for any trip. Enter distance, fuel efficiency, and price per liter or gallon. Free online.
Calculate how much a trip will cost in fuel before you leave. Enter your distance, your vehicle's fuel efficiency, and the current fuel price — the calculator handles the rest for both metric (km / L per 100km) and imperial (miles / mpg) units.
Metric vs imperial inputs
In metric mode, fuel efficiency is entered as L/100km (liters consumed per 100 kilometers — lower is better). In imperial mode, it is entered as mpg (miles per gallon — higher is better). The calculator automatically converts internally; you never need to do the conversion yourself. Most European and Asian vehicles report L/100km; most North American vehicles report mpg.
Tips to reduce fuel costs
- Maintain tire pressure — under-inflated tires increase rolling resistance and can worsen efficiency by 2–3%.
- Drive at steady speed — rapid acceleration and hard braking burn significantly more fuel than smooth driving at highway speeds.
- Remove roof racks when not in use — drag increases fuel consumption noticeably at speeds above 80 km/h.
- Air conditioning — AC can increase fuel consumption by 5–25% depending on conditions.
- Cold starts — engines are least efficient in the first few minutes of driving. Short trips disproportionately hurt average consumption.
How to find your vehicle efficiency
Check your vehicle manual or the manufacturer website for the official combined fuel consumption figure. For a real-world estimate, fill the tank completely, reset the trip odometer, drive normally until the tank is nearly empty, then fill again and divide the liters added by the kilometers driven (multiply by 100 for L/100km).