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Mileage Calculator

Calculate fuel economy in km/L, L/100 km and US MPG.

Best for: Checking real-world economy, comparing before and after a service, or verifying a manufacturer's claim.

Complete guide
Country (units):

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How it's calculated & sources
The Mileage Calculator uses the standard formula for this calculation. It runs entirely in your browser, so your inputs are never uploaded. Figures are educational estimates, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Mileage?
A mileage calculator works out your vehicle's fuel economy — miles per gallon or litres per 100 km — from the distance driven and the fuel used.
Why does Mileage matter?
Your real economy, which you can compare against the rated figure and track over time to spot maintenance issues.
How is Mileage calculated?
Drive between two full tanks, noting the trip distance and the fuel added to refill. MPG is miles divided by gallons; L/100km is litres times 100 divided by kilometres. Averaging several tanks gives a far more reliable figure than one.
What are common mileage mistakes?
Not filling to the same level at both ends, which skews the fuel figure.
When should you use the Mileage Calculator?
Checking real-world economy, comparing before and after a service, or verifying a manufacturer's claim.

What is the Mileage Calculator?

A mileage calculator works out your vehicle's fuel economy — miles per gallon or litres per 100 km — from the distance driven and the fuel used.

How the Mileage Calculator works

Drive between two full tanks, noting the trip distance and the fuel added to refill. MPG is miles divided by gallons; L/100km is litres times 100 divided by kilometres. Averaging several tanks gives a far more reliable figure than one.

Fuel economy — US MPG, litres per 100 km, km per litre

1515.686.38
2011.768.5
259.4110.63
307.8412.75
356.7214.88
405.8817.01
504.721.26
603.9225.51

Common mistakes to avoid

  • Not filling to the same level at both ends, which skews the fuel figure.
  • Judging from a single tank — average several for accuracy.
  • Confusing MPG (higher is better) with L/100km (lower is better).

Keywords: mileage, fuel, economy, mpg.

Sources: US EPA / DOE — fueleconomy.gov

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Mileage Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Mileage Calculator?+

Mileage Calculator uses the standard mileage formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Mileage Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Mileage Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Mileage Calculator on Free Tools Galaxy — Calculate fuel economy in km/L, L/100 km and US MPG. https://freetoolsgalaxy.com/tools/mileage-calculator
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# Mileage Calculator — the free tool I keep coming back to

Calculate fuel economy in km/L, L/100 km and US MPG.

Try it: https://freetoolsgalaxy.com/tools/mileage-calculator
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The fastest way is to use a free in-browser mileage calculator: https://freetoolsgalaxy.com/tools/mileage-calculator. Calculate fuel economy in km/L, L/100 km and US MPG.

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