L/100km to km/L Converter
Convert liters per 100 km to kilometers per liter — the two metric fuel-economy conventions. Results update as you type; exact factors shown.
One liters per 100 km is 100 kilometers per liter — 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 US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common fuel economy conversions
| From | To | Units |
|---|---|---|
| 3 L/100 km | 33.3333 km/L | liters per 100 km to kilometers per liter |
| 4 L/100 km | 25 km/L | liters per 100 km to kilometers per liter |
| 5 L/100 km | 20 km/L | liters per 100 km to kilometers per liter |
| 6 L/100 km | 16.6667 km/L | liters per 100 km to kilometers per liter |
| 7 L/100 km | 14.2857 km/L | liters per 100 km to kilometers per liter |
| 8 L/100 km | 12.5 km/L | liters per 100 km to kilometers per liter |
| 9 L/100 km | 11.1111 km/L | liters per 100 km to kilometers per liter |
| 10 L/100 km | 10 km/L | liters per 100 km to kilometers per liter |
| 12 L/100 km | 8.3333 km/L | liters per 100 km to kilometers per liter |
| 15 L/100 km | 6.6667 km/L | liters per 100 km to kilometers per liter |
| 20 L/100 km | 5 km/L | liters per 100 km to kilometers per liter |
| 25 L/100 km | 4 km/L | liters per 100 km to kilometers per liter |
Units in this converter and their exact factors
| Unit | Symbol | To L/100 km |
|---|---|---|
| liters per 100 km | L/100 km | x |
| kilometers per liter | 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 Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.