How do I manually calculate gas mileage?

Fill your tank completely, reset your trip odometer, drive normally, refill the tank, and divide the miles driven by the gallons pumped.

What is considered good gas mileage?

For standard gasoline cars, over 30 MPG (approx 12.7 Km/L or 7.8 L/100km) is considered good fuel efficiency.

What do I need to enter?

Just Measurement Units, Distance, Fuel Consumed and Fuel Price. Every field has a sensible default you can start from.

Is my data uploaded anywhere?

No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.

Does it work on a phone?

Yes. The layout adapts to small screens and needs no app or signup.

Gas Mileage & Fuel Economy Calculator

Calculate MPG (Miles Per Gallon), Km/L, L/100km, and estimate total trip fuel cost.

100% free
Private in browser
No signup
No watermarks

Measurement Units

Distance (Kilometers)

Fuel Consumed (Liters)

Fuel Price (per Liter)

Fuel Economy

15 Km/L

35.3 MPG (US)

Consumption

6.7

Liters / 100 Km

Total Trip Cost

₹ / $ 2895

for 450 Kilometers

Cost per Distance

6.43

per Kilometer

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About Gas Mileage & Fuel Economy Calculator

Calculate your car or motorcycle fuel economy easily. Enter the distance traveled and fuel consumed to instantly find your MPG (Miles Per Gallon), Km/L, and Liters per 100km, alongside an accurate trip cost and cost-per-mile estimation.

How to use Gas Mileage & Fuel Economy Calculator

Select your unit system: US/Imperial (Miles & Gallons) or Metric (Kilometers & Liters).
Enter distance driven and fuel added/consumed.
Enter the fuel price per unit to calculate total trip cost.
Review your fuel efficiency metrics (MPG, Km/L, L/100km).

Key features

Dual Unit Support: Miles & Gallons (US/UK) or Kilometers & Liters
Calculates MPG, Km/L, and L/100km simultaneously
Estimates total trip cost and cost per distance unit
Compare city vs highway economy benchmarks
100% free and mobile-friendly

Frequently asked questions

How do I manually calculate gas mileage?: Fill your tank completely, reset your trip odometer, drive normally, refill the tank, and divide the miles driven by the gallons pumped.
What is considered good gas mileage?: For standard gasoline cars, over 30 MPG (approx 12.7 Km/L or 7.8 L/100km) is considered good fuel efficiency.
What do I need to enter?: Just Measurement Units, Distance, Fuel Consumed and Fuel Price. Every field has a sensible default you can start from.
Is my data uploaded anywhere?: No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?: Yes. The layout adapts to small screens and needs no app or signup.

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