Gas Mileage Calculator
Calculate your fuel consumption and gas mileage. Estimate trip fuel and cost, compare two cars side by side. Every formula online and free — no sign-up required.
How to Use the Gas Mileage Calculator
The calculator works in three modes. "Measure Consumption" — enter the distance you drove and the amount of fuel you filled up, and get your car's real-world consumption in liters per 100 km. It's the most accurate way to learn how much your car actually burns, no matter what the spec sheet claims.
"Trip: Fuel Needed" — enter the distance and your average consumption to work out in advance how much fuel a route will take. Add the price per liter and the calculator shows the full trip cost. Handy for planning long drives, vacations, or business trips.
"Compare 2 Cars" — enter the consumption of two cars and a single distance. The calculator shows how much fuel and money the more efficient option saves. It helps you choose a car when buying, or weigh the benefit of switching to diesel, a hybrid, or a smaller engine.
What the Calculator Works Out
Real Consumption
Liters per 100 km and kilometers per liter based on actual driving: enter your distance and fill-up to get a precise result with no rounding.
Trip Estimate
How much fuel and money a route will take. Plug in your average consumption, distance, and fuel price to see the full cost.
Car Comparison
The difference in fuel and cost between two cars over the same distance. It helps you see whether the more efficient model pays off.
Frequently Asked Questions
How do I measure real fuel consumption?
Fill the tank to the brim and reset the trip odometer. Drive 200–500 km, then fill up to full again. Divide the liters by the kilometers and multiply by 100 — that's your consumption per 100 km.
What counts as normal fuel consumption?
For city sedans, 6–9 L/100 (gasoline) or 4–6 L/100 (diesel). Crossovers run 8–12 L/100, SUVs 12–18 L/100, and EVs 15–25 kWh/100. Spec-sheet figures are usually 15–25% lower than real-world city driving.
Can I account for traffic?
Yes, through your average consumption. In traffic the engine idles a lot, so budget 20–40% more for city driving than for the highway. If your highway average is 6 L/100, use 8–8.5 for the city. The calculator runs on that figure, so there's no need to add traffic separately.
Why compare two cars?
To see the savings up front, before you buy or replace a car. The calculator shows the difference in fuel and cost over a specific mileage — for example, 20,000 km a year. It helps you judge whether the price gap between an efficient and a thirstier model pays off within a reasonable time.
Does fuel consumption differ between winter and summer?
Yes — in winter it runs 10–25% higher. The reasons: engine warm-up, thicker oil, the heater and defrosters, and loose snow under the tires. For an accurate yearly estimate, calculate two periods separately: summer consumption and winter (add 15–20%), then add them up.