MPG to L/100km Converter
Convert US/UK miles per gallon (MPG) to L/100km and back — for comparing fuel efficiency between American and European vehicles.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
L/100km
7.84 L/100km
Formula: L/100km = 235.215 ÷ US MPG
| US MPG | L/100km | Efficiency |
|---|---|---|
| 15 | 15.7 | Poor |
| 20 | 11.8 | Below avg |
| 25 | 9.4 | Average |
| 30 | 7.8 | Good |
| 40 | 5.9 | Efficient |
| 50 | 4.7 | Hybrid |
| 60 | 3.9 | EV-like |
This tool provides general unit conversions for everyday and educational use. For regulated, legal, or scientific applications, verify conversion factors against the applicable official standard.
About the MPG to L/100km Converter
The MPG to L/100km converter changes fuel economy between miles per gallon (US or UK gallons) and litres per 100 kilometres. The two measures are inverses: MPG says how far you go on a fixed amount of fuel, L/100km says how much fuel a fixed distance uses, so higher MPG means lower L/100km. L/100km = 235.215 ÷ US MPG.
How to use it
- 1Choose MPG → L/100km or L/100km → MPG.
- 2Choose US or UK gallons.
- 3Enter the figure and read the result.
- 4Copy, share or print the result with the buttons below it.
Worked example
30 US MPG = 235.215 ÷ 30 ≈ 7.84 L/100km. A car using 6.5 L/100km achieves about 36.2 US MPG.
How it works
Formula
L/100km = 235.215 ÷ US MPG
L/100km = 282.481 ÷ UK MPG
US gallon = 3.78541 L · UK gallon = 4.54609 L.
Common use cases
- Comparing cars from different markets
- Estimating fuel costs abroad
- Reading vehicle reviews
Frequently asked questions
A:Yes — lower L/100km means less fuel used per 100 km. A car using 5 L/100km is more efficient than one using 10 L/100km.
A:The US gallon (3.785 L) is smaller than the UK imperial gallon (4.546 L). A car rated 40 UK MPG = only ~33 US MPG.
Reviewed for accuracy · Last updated October 7, 2026
Conversion factors are based on internationally defined SI units and standard metric/imperial equivalence tables.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
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