Travel, Auto & Lifestyle
Mileage Calculator
Mileage Calculator is a browser-based calculator tool on CalcToolsBase. Free, browser-based mileage tool. Turn distance and fuel into km/L, US mpg, UK mpg, and L/100 km at once, in metric or US input units. To use it, enter your values and view the result directly in your browser — no signup and nothing to install.
From your units, distance and fuel used, Mileage Calculator computes your mileage in mpg, km/L and L/100km via distance ÷ fuel used. No accounts, no uploads — just an instant way to work out your fuel economy.
Estimate only. Real fuel economy varies with vehicle load, traffic, terrain, driving style, tyre pressure, weather, and fuel type. Everything runs locally in your browser and nothing you enter is uploaded.
About this tool
The Mileage Calculator gives you a quick way to work out your fuel economy. Enter your units, distance and fuel used; it then returns your mileage in mpg, km/L and L/100km, worked out with distance ÷ fuel used the moment you calculate. It runs fully in the browser, so it is private by design and works offline once loaded.
How to use
- Choose whether you will enter metric or US units.
- Type the distance you travelled.
- Type the fuel used for that distance.
- Press Calculate to see all four economy units.
Why use the Mileage Calculator
Instant
Each result is worked out on your device the moment you press Calculate.
Private
The numbers you enter stay in your browser and are never uploaded.
Free
No signup and no paywall to use any tool in this set.
Works offline
Once the page has loaded it keeps working on a weak or dropped connection.
Clear units
Inputs and outputs name their units so you know exactly what you are reading.
Honest by design
Uses simplified browser-side formulas for estimates; real fuel economy varies with driving conditions, load and how you measure fuel.
Common uses
Mileage for comparing efficiency between fill-ups
Mileage when converting between mpg and L/100km
Mileage for monitoring a vehicle's economy
Mileage when checking mpg or L/100km
Mileage for a quick mileage check
Mileage when comparing vehicles
Technical notes
Mileage Calculator divides the distance travelled by the fuel used to give fuel economy in mpg, km/L and L/100km.
Real fuel economy varies with load, traffic, terrain, driving style and conditions.
Nothing you type is uploaded — the calculation happens entirely on your device.
Worked example
Travelling 500 km on 40 litres is 500 ÷ 40 = 12.5 km/L.
FAQ
Which fuel economy units does this show?
It shows km per litre, US miles per gallon, UK miles per gallon, and litres per 100 km, all worked out from the single trip you enter.
Why do US and UK mpg differ?
A UK gallon is larger than a US gallon, about 4.546 versus 3.785 litres, so the same economy is a higher number in UK mpg.
How is this different from the gas mileage tool?
The gas mileage tool is mpg-first for US miles and gallons. This tool lets you input metric or US units and returns all four economy units at once.
What does L per 100 km mean?
It is the litres of fuel used to travel 100 km. Unlike mpg, a lower litres per 100 km number means a more efficient vehicle.