Mileage Calculator – Calculate Your Car's Fuel Efficiency (MPG & km/L)

Find out your car's real-world mileage with our free Mileage Calculator. Simply enter the distance traveled and the amount of fuel used to instantly calculate MPG, km/L, or L/100km. Great for tracking fuel efficiency and planning fuel budgets.

Distance Traveled

Fuel Used

Results

Enter values and click Calculate to see results

How to Use This Mileage Calculator

Fill your tank and reset trip odometer

Start with a full tank. Reset your trip odometer to zero, or note the current odometer reading.

Drive normally, then refill

Drive until you need fuel again. Fill the tank completely and note how many gallons or liters it took.

Enter values and calculate

Input the distance traveled and fuel used. Select your units. The calculator shows MPG, km/L, and L/100km.

Fuel Efficiency Comparison by Vehicle Type

Vehicle Type	Avg MPG	Avg L/100km
Compact Car	30-40	5.9-7.8
Midsize Sedan	25-35	6.7-9.4
SUV (Compact)	22-30	7.8-10.7
SUV (Full-size)	15-22	10.7-15.7
Pickup Truck	15-25	9.4-15.7
Hybrid	45-55	4.3-5.2
Electric (MPGe)	100-130	N/A

Note: Actual mileage varies based on driving habits, conditions, and vehicle maintenance.

Understanding Fuel Efficiency Metrics

MPG (Miles Per Gallon)

Used primarily in the US and UK. Higher numbers mean better efficiency. A car getting 30 MPG travels 30 miles on one gallon of fuel. The formula is: MPG = Distance (miles) ÷ Fuel Used (gallons).

km/L (Kilometers Per Liter)

Common in many countries. Works like MPG but uses metric units. A car getting 15 km/L travels 15 kilometers on one liter of fuel. Formula: km/L = Distance (km) ÷ Fuel Used (liters).

L/100km (Liters Per 100 Kilometers)

Standard in Europe, Canada, and Australia. Lower numbers mean better efficiency—the opposite of MPG. A car using 8 L/100km consumes 8 liters to travel 100 km. Formula: L/100km = (Fuel Used ÷ Distance) × 100.

Tips for Better Fuel Economy

Drive smoothly

Avoid rapid acceleration and hard braking. Gentle inputs can improve highway mileage by 15-30%.

Maintain steady speeds

Use cruise control on highways. Fuel economy typically drops sharply above 50 mph (80 km/h).

Keep tires properly inflated

Underinflated tires increase rolling resistance. Check pressure monthly when tires are cold.

Reduce weight and drag

Remove unnecessary items from your trunk. Roof racks and cargo boxes increase drag and reduce MPG.

Frequently Asked Questions

Why is my actual MPG lower than the EPA rating?

EPA tests are conducted in controlled conditions. Real-world driving includes traffic, hills, AC use, and varying speeds—all of which reduce mileage. Cold weather can reduce MPG by 10-20%. Aggressive driving has an even bigger impact.

How accurate is my car's displayed MPG?

Most cars overestimate by 2-5 MPG. The display calculates from fuel injector data, not actual consumption. For accurate numbers, use the fill-up method: track miles driven between full tanks and divide by gallons pumped.

Does premium fuel improve mileage?

Only if your car requires it. High-compression engines designed for premium will run poorly on regular. For cars that recommend regular, premium provides no benefit—the engine can't take advantage of the higher octane.

How much does idling affect fuel economy?

Idling gets 0 MPG. Modern engines use less fuel restarting than idling for more than 10 seconds. If you'll be stopped longer than a minute (train crossings, long waits), turn off the engine.

What's the most fuel-efficient speed?

Most cars achieve peak MPG between 45-55 mph (72-88 km/h). Fuel economy drops about 1% for every mph over 55. At 75 mph, you might use 25% more fuel than at 55 mph.

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