Gas Mileage Calculator

Fuel economy from distance and fuel used — MPG, MPL, or km/L.

The Gas Mileage Calculator converts trip distance and fuel used into MPG or L/100 km (depending on your unit preference). Handy for comparing cars, tracking fill-ups, or estimating fuel cost for a drive. What this calculator does Enter distance and fuel volume. Simple Calculators reports efficiency in the unit system you choose — US drivers often think in MPG; many other regions prefer L/100 km. Lower L/100 km means better efficiency; higher MPG means better efficiency. They move in opposite directions as numbers. How the math works MPG = miles ÷ gallons. L/100 km = (litres ÷ km) × 100. Mixed-unit trips should be converted first so numerator and denominator match. Use the Units control to switch systems without retyping every field.