L/100km to km/L Converter
Convert litres per 100 km to kilometres per litre — the two metric fuel-economy conventions. Results update as you type; exact factors shown.
One litres per 100 km is 100 kilometres per litre — see the exact factor, not a rounded rule of thumb.
How the l/100km to km/l converter works
Fuel economy is an inverse quantity: lower L/100 km is better, higher mpg is better. mpg (US) = 235.215 / (L/100 km) because a US gallon is 3.785 L and a mile 1.609 km; mpg (UK) = 282.481 / (L/100 km) with the 4.546 L imperial gallon. UK mpg figures are therefore always 20% higher than US mpg for the same car.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common fuel economy conversions
| From | To | Units |
|---|---|---|
| 3 L/100 km | 33.3333 km/L | litres per 100 km to kilometres per litre |
| 4 L/100 km | 25 km/L | litres per 100 km to kilometres per litre |
| 5 L/100 km | 20 km/L | litres per 100 km to kilometres per litre |
| 6 L/100 km | 16.6667 km/L | litres per 100 km to kilometres per litre |
| 7 L/100 km | 14.2857 km/L | litres per 100 km to kilometres per litre |
| 8 L/100 km | 12.5 km/L | litres per 100 km to kilometres per litre |
| 9 L/100 km | 11.1111 km/L | litres per 100 km to kilometres per litre |
| 10 L/100 km | 10 km/L | litres per 100 km to kilometres per litre |
| 12 L/100 km | 8.3333 km/L | litres per 100 km to kilometres per litre |
| 15 L/100 km | 6.6667 km/L | litres per 100 km to kilometres per litre |
| 20 L/100 km | 5 km/L | litres per 100 km to kilometres per litre |
| 25 L/100 km | 4 km/L | litres per 100 km to kilometres per litre |
Units in this converter and their exact factors
| Unit | Symbol | To L/100 km |
|---|---|---|
| litres per 100 km | L/100 km | x |
| kilometres per litre | km/L | 100÷x |
| miles per imperial gallon | mpg (UK) | 282.480936÷x |
| miles per US gallon | mpg (US) | 235.214583÷x |
FAQFrequently asked questions about fuel economy conversion
How do I convert L/100km to km/L?
Divide 100 by the figure. 8 L/100km is 12.5 km/L.
Which is better, higher or lower?
Lower L/100km is better; higher km/L is better. They run in opposite directions.
Which countries use which?
Australia and Europe use L/100km; India, Japan and parts of Asia use km/L.
Is the conversion linear?
No — they are reciprocals, so halving consumption doubles km/L.
What is 5 L/100km in km/L?
20 km/L.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.