Gas Mileage Calculator

Calculate MPG from distance driven and fuel used.

Gas Mileage Calculator

Formula

MPG = miles / gallons

Simple distance over fuel volume.

This gas mileage calculator computes MPG from distance and fuel used: MPG = miles / gallons.

Example: 300 miles on 10 gallons is 30.00 MPG. Keep units consistent.

Turn efficiency into trip spend with the fuel cost calculator. For reimbursement style mileage amounts, see the mileage calculator.

Related calculators

Frequently Asked Questions

Why is my trip computer different?

Computers estimate continuously. Fill up math uses pump gallons, which many people treat as the reality check.

Can I average several tanks?

Add total miles and total gallons across tanks, then divide once for a weighted average.

What is the default example?

300 miles and 10 gallons equal 30 MPG.

Should I use partial fill ups?

Full to full is cleaner. Partial fill ups make MPG noisier.

Can I enter litres in the gallons box?

No. Convert litres to gallons first, or the MPG will be wrong.

How do I compare two cars?

Use the same driving mix. City only tanks look worse than highway tanks for most vehicles.

How do I get L/100 km?

Convert after you have MPG with a standard factor. This tool returns MPG.

How do I estimate trip fuel cost next?

Use the fuel cost calculator with your MPG, distance, and pump price.