Updated Fuel Economy

Gas Mileage Calculator

Convert MPG, km/L and L/100km, calculate real fuel economy from distance and fuel used, estimate trip fuel cost, cost per mile/km, fuel needed, and savings from a more efficient car.

MPG & L/100km Trip Cost Fuel Needed Efficiency Comparison

All-in-One Gas Mileage Suite

Switch between unit conversion, real-world fuel economy, trip cost, cost per mile/km, fuel needed, and old vs new efficiency comparison with fuel type selection.

Enter any one fuel economy value and convert it to the other formats.

Calculate actual gas mileage from a real trip using distance traveled and fuel used.

Estimate trip fuel cost using distance, fuel economy and fuel price. Choose fuel type for a clearer summary.

Find cost per mile and per kilometer using fuel economy and fuel price.

Calculate how much fuel you need for a trip based on distance and fuel economy.

Compare your old and new vehicle fuel economy and see percentage improvement and potential savings per 100 miles and per 100 km.

Gas Mileage Calculator – Fuel Economy, Trip Cost And Savings

This Gas Mileage Calculator lets you work with fuel economy the way drivers actually use it. You can convert between MPG, km/L and L/100km, compute real-world gas mileage from a trip, estimate how much a journey will cost based on fuel prices, calculate cost per mile or kilometer, see how much fuel you need, and compare old and new vehicles to understand efficiency gains and potential savings.

MPG, km/L And L/100km In One Place

The converter tab acts as a unit bridge between US, UK and metric style fuel economy measures. The gas mileage tab turns distance and fuel usage into all three formats, so one refuel can tell you exactly how efficiently your car is running in your preferred units.

Trip Cost, Fuel Needed And Vehicle Upgrade Savings

The trip cost and fuel needed tabs help you budget a drive ahead of time by estimating fuel usage and cost for a given distance, fuel economy and fuel price. The efficiency comparison tab shows how much fuel and money you can save per 100 miles or 100 kilometers by moving from an older vehicle to a more efficient one, using an optional fuel price to put those improvements into real currency.