Formula.litres per 100 km = 235.215 ÷ miles per gallon.
Relationship.L/100km = 235.215 ÷ MPG (US).
Worked example. 30 mpg = 7.84 L/100km.
MPG to L/100km Converter.
L/100km = 235.215 ÷ MPG (US), so 30 mpg = 7.84 L/100km. Type any value below to convert MPG to L/100km instantly.
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Copied ✓ L/100km
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| mpg | L/100km | km/L | mpg (UK) | mi/L |
|---|---|---|---|---|
| 0.03 | 7840.4861 | 0.0127543112 | 0.0360284978 | 0.0079251616 |
| 0.3 | 784.048612 | 0.1275431121 | 0.3602849782 | 0.0792516156 |
| 3 | 78.404861 | 1.275431 | 3.60285 | 0.7925161563 |
| 30 | 7.840486 | 12.754311 | 36.028498 | 7.925162 |
| 300 | 0.7840486119 | 127.543112 | 360.284978 | 79.251616 |
| 3000 | 0.0784048612 | 1275.4311 | 3602.8498 | 792.516156 |
| 30000 | 0.0078404861 | 12754.3112 | 36028.4978 | 7925.1616 |
How to convert MPG to L/100km
MPG to L/100km conversion table
| mpg | L/100km |
|---|---|
| 10 | 23.521458 |
| 12 | 19.601215 |
| 15 | 15.680972 |
| 18 | 13.067477 |
| 20 | 11.760729 |
| 22 | 10.691572 |
| 25 | 9.408583 |
| 28 | 8.400521 |
| 30 | 7.840486 |
| 32 | 7.350456 |
| 35 | 6.720417 |
| 38 | 6.189857 |
| 40 | 5.880365 |
| 42 | 5.600347 |
| 45 | 5.226991 |
| 48 | 4.900304 |
| 50 | 4.704292 |
| 55 | 4.276629 |
| 60 | 3.920243 |
| 65 | 3.618686 |
| 70 | 3.360208 |
| 75 | 3.136194 |
| 80 | 2.940182 |
| 90 | 2.613495 |
| 100 | 2.352146 |
Frequently Asked Questions
How do I convert MPG to L/100km?
Divide 235.215 by the US MPG figure. For example, 30 mpg gives 235.215 ÷ 30 ≈ 7.84 L/100km. It is a division, not a multiplication, because the two units run in opposite directions.
Why is it a division and not a multiplication?
Because the units are inversely related. MPG measures distance per unit of fuel — higher is better. L/100km measures fuel per unit of distance — lower is better. Every other unit conversion on this site is a simple multiplication; this one is not.
What is 40 mpg in L/100km?
235.215 ÷ 40 ≈ 5.88 L/100km, which counts as an efficient modern petrol car. 20 mpg, by contrast, is 11.76 L/100km.
Is this US or Imperial MPG?
US MPG, which uses the 3.785-litre US gallon. For Imperial (UK) MPG, divide 282.481 instead — the Imperial gallon is 4.546 litres, so the same car scores about 20% higher.