Car Mileage Calculator
Calculate your vehicle's fuel economy (MPG or km/L) easily.
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How to Use the Mileage Calculator
Using this calculator is the fastest way to check your vehicle's fuel efficiency. Follow these simple steps:
- Enter Distance: In the first box, type the total distance you drove since your last refuel. Use the dropdown to select either Kilometers (km) or Miles (mi).
- Enter Fuel Used: In the second box, enter the amount of fuel you needed to fill the tank back up. Select your unit: Liters (L) or Gallons (gal).
- Calculate: Click the blue "Calculate" button. The tool will instantly show your result in the most common unit (MPG or km/L) and provide an alternative conversion.
How to Calculate Gas Mileage Manually
If you want to do the math yourself without a tool, the formula is straightforward. Tracking this over time can help you spot engine issues early.
The Formula
Mileage = Total Distance ÷ Fuel Consumed
Calculation Examples
- Metric System (km/L): If you travel 400 km and use 25 liters of fuel, your efficiency is 400 ÷ 25 = 16 km/L.
- Imperial System (MPG): If you travel 300 miles and use 10 gallons of gas, your efficiency is 300 ÷ 10 = 30 MPG.
What is Considered Good Gas Mileage?
Fuel economy varies significantly depending on the vehicle type, age, and driving conditions. Here is a general breakdown of what is considered "good" mileage in 2025:
- Sedans & Compact Cars: 30–40 MPG (12–17 km/L) is excellent.
- SUVs & Trucks: 20–25 MPG (8.5–10.5 km/L) is considered good for this class.
- Hybrids: Should achieve 45–55 MPG (19–23 km/L) or higher.
5 Tips to Improve Your Fuel Economy
Want to save money at the pump? Small changes to your driving habits can increase your mileage by up to 25%.
1. Check Your Tire Pressure
Under-inflated tires increase rolling resistance, forcing your engine to work harder. Check your PSI once a month to ensure they are inflated to the manufacturer's recommendation.
2. Avoid Rapid Acceleration
Aggressive driving—speeding, rapid acceleration, and hard braking—can lower your gas mileage by roughly 15% to 30% at highway speeds. Drive smoothly to save fuel.
3. Remove Excess Weight
An extra 100 pounds in your vehicle can reduce your MPG by up to 1%. Clear out the trunk and remove roof racks when they are not in use to improve aerodynamics.
4. Reduce Idling
Idling gets 0 miles per gallon. If you are going to be stopped for more than 60 seconds (except in traffic), turn off your engine. Modern cars use less fuel to restart than to idle for long periods.
5. Use Cruise Control
On the highway, using cruise control helps you maintain a constant speed and, in most cases, will save gas.
Frequently Asked Questions (FAQ)
How do I calculate MPG manually?
To calculate MPG manually, divide the miles traveled by the gallons of gas used. For example, if you drove 300 miles on 10 gallons of gas, your MPG is 30.
Does using the air conditioner reduce gas mileage?
Yes, using the AC can reduce fuel economy by up to 25%, especially during short trips or city driving. Opening windows at low speeds is more efficient, while AC is better at highway speeds to reduce drag.
What is the difference between city and highway mileage?
City driving involves frequent stopping and starting, which consumes more fuel. Highway driving is usually consistent at higher speeds, allowing the engine to run more efficiently, resulting in better mileage.
How often should I check my tire pressure for better mileage?
You should check your tire pressure at least once a month. Under-inflated tires increase rolling resistance and can lower your gas mileage by 0.2% for every 1 psi drop in pressure.
Is km/L better than MPG?
Neither is "better," they are simply different units. km/L is used in countries using the metric system, while MPG is used in the US and UK. 1 km/L is roughly equal to 2.35 MPG.