About Gas Mileage Calculator

MPG + L/100km + km/L — US or metric units in one calculator. Part of the DevTools Surf developer suite. Browse more tools in the Calculators collection.

Use Cases

• Road trippers calculating fuel costs between destinations
• Fleet managers tracking vehicle efficiency across a car pool
• Automotive reviewers comparing MPG between test vehicles
• Eco-conscious drivers monitoring their fuel consumption trends

Tips

• Enter distance and fuel used to get MPG, L/100km, and km/L
• Toggle between US and metric units in one calculator
• Compare results to EPA estimates for your vehicle model

Fun Facts

• The first EPA fuel economy estimates were mandated by the Energy Policy and Conservation Act of 1975, driven by the 1973 oil crisis that quadrupled gas prices.
• L/100km is the standard fuel efficiency metric in Europe and Canada, while the U.S. uses MPG — they are inversely related, which makes mental conversion tricky.
• The most fuel-efficient non-electric production car ever made was the 2000 Honda Insight (first generation), achieving 70 MPG combined on the highway.

FAQ

Which units?

MPG (US gallons), MPG (UK imperial gallons — different size), L/100km (Europe default), km/L (some Asia). All shown simultaneously so you can read whichever.

Does it calculate cost per mile?

Yes — with fuel price input. Useful for comparing cars or estimating trip cost.

What about trip total?

Enter distance + mpg + fuel price for a complete trip-cost estimate. Useful when planning road trips.

Is this for electric vehicles?

Designed for ICE. Electric vehicles are typically measured in kWh/100mi or miles/kWh — different enough that a dedicated EV-efficiency calculator is better.