Preparing workspace

Vehicle Unit Converter

Convert fuel economy between km/l, mpg and L/100km, vehicle speed between km/h and mph, and speed limit signs between countries.

About this tool

Vehicle Unit Converter

Convert fuel economy between km/l, mpg and L/100km, vehicle speed between km/h and mph, and speed limit signs between countries.

Pick the conversion and enter the value from your car, sign or spec sheet. This page brings together 3 separate vehicle unit converter pages (Fuel economy, Speed limit, Speed) so you can compare them without hunting for the right one.

How to use Vehicle Unit Converter

  1. 1

    Open Vehicle Unit Converter on AltFTool — it loads instantly in your browser.

  2. 2

    Choose your convert at the top: Fuel economy, Speed limit, Speed. On a phone it is a drop-down list.

  3. 3

    Fill in the vehicle unit converter for that convert; each of the 3 options keeps its own rules, data and defaults.

  4. 4

    Read the result, then switch convert to compare. The page link keeps your convert (?v=fuel-economy), so you can bookmark or share it.

Why use Vehicle Unit Converter

  • All 3 in one place

    Fuel economy, Speed limit, Speed and the rest sit behind one picker, so switching convert takes a tap instead of a new search.

  • Built for each option

    Every convert keeps its own rules, numbers and defaults rather than one generic template.

  • Shareable view

    The link remembers the convert you picked, so a bookmark or a shared link opens straight on it.

Common use cases

  • Reading a US road-test mpg figure when your own car's economy is quoted in km/l.
  • Work out what a 100 km/h motorway sign in France means for a driver used to reading mph.
  • Read a speed limit sign abroad in mph and know what to hold on a km/h speedometer.

Frequently asked questions

Which convert options does this tool cover?

3: Fuel economy, Speed limit, Speed. Pick one at the top of the tool; the page link updates (for example ?v=fuel-economy) so you can bookmark or share that exact view.

How do I convert km/l to litres per 100 km?

Divide 100 by the km/l figure: 15 km/l is 100 ÷ 15 = 6.67 l/100 km. The relationship is a reciprocal, not a scaling, so improvements at the efficient end matter less than they look — going from 20 to 25 km/l saves 1 litre per 100 km, while going from 5 to 6 km/l saves 3.3.

How many mph is 100 km/h?

100 km/h is 62.14 mph, found by dividing 100 by 1.609344. A road signed at 100 km/h therefore sits between the 60 mph and 65 mph limits used in mph countries, closer to 60. The conversion is exact because one international mile is defined as 1609.344 metres.

Embed this tool on your site

Add the Vehicle Unit Converter widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.

<iframe src="https://www.altftool.com/embed/widget/vehicle-unit-converter"
  title="Vehicle Unit Converter — free AltFTool widget"
  width="100%" height="640" style="border:0;border-radius:12px;overflow:hidden"
  loading="lazy" referrerpolicy="no-referrer-when-downgrade" allow="clipboard-write"></iframe>
<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/tools/all/vehicle-unit-converter?utm_source=embed&amp;utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>

Browse all embeddable widgets →

Discover more

Guides & more from AltFTool