Fuel Economy converter
Miles per Gallon (UK) to Liters per 100km
Converting Miles per Gallon (UK) to Liters per 100km is a single multiplication when you know the factor. One mpg (UK) equals 282.481088 L/100km, so multiply the value in mpg (UK) by 282.481088. The calculator below works in both directions and accepts decimals.
Formula 1 mpg (UK) = 282.481088 L/100km
Need the other direction? Liters per 100km to Miles per Gallon (UK).
How to convert Miles per Gallon (UK) to Liters per 100km
UK miles per gallon equals about 0.354 km/L because the imperial gallon is 4.546 litres. Litres per 100 km is an inverse measure: lower is better, and it is not linear.
To convert Miles per Gallon (UK) to Liters per 100km, multiply the value in mpg (UK) by 282.481088. For example, 10 mpg (UK) × 282.481088 = 28.248109 L/100km. This works because the ratio between the two units is constant for every value in fuel economy.
Worked examples
| mpg (UK) | L/100km |
|---|---|
| 1 mpg (UK) | 282.481088 L/100km |
| 2.5 mpg (UK) | 112.992435 L/100km |
| 5 mpg (UK) | 56.496218 L/100km |
| 10 mpg (UK) | 28.248109 L/100km |
| 25 mpg (UK) | 11.299244 L/100km |
| 50 mpg (UK) | 5.649622 L/100km |
| 100 mpg (UK) | 2.824811 L/100km |
Reverse conversion
| L/100km | mpg (UK) |
|---|---|
| 1 L/100km | 282.481088 mpg (UK) |
| 5 L/100km | 56.496218 mpg (UK) |
| 10 L/100km | 28.248109 mpg (UK) |
| 25 L/100km | 11.299244 mpg (UK) |
| 50 L/100km | 5.649622 mpg (UK) |
| 100 L/100km | 2.824811 mpg (UK) |
When this conversion is useful
This is the calculation you need when you are comparing a car's consumption with a different unit system. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 mpg (UK) is 0.28248109 L/100km.
Is the conversion exact?
No: fuel economy has inverse units. Litres per 100 km and gallons per mile fall as efficiency rises, so the conversion divides rather than multiplies.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
mpg (UK) to L/100km conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Miles per Gallon (UK) (mpg (UK)) | Liters per 100km (L/100km) |
|---|---|
| 1 mpg (UK) | 282.481088 L/100km |
| 2 mpg (UK) | 141.240544 L/100km |
| 3 mpg (UK) | 94.160363 L/100km |
| 4 mpg (UK) | 70.620272 L/100km |
| 5 mpg (UK) | 56.496218 L/100km |
| 6 mpg (UK) | 47.080181 L/100km |
| 7 mpg (UK) | 40.354441 L/100km |
| 8 mpg (UK) | 35.310136 L/100km |
| 9 mpg (UK) | 31.386788 L/100km |
| 10 mpg (UK) | 28.248109 L/100km |
| 11 mpg (UK) | 25.680099 L/100km |
| 12 mpg (UK) | 23.540091 L/100km |
| 13 mpg (UK) | 21.729314 L/100km |
| 14 mpg (UK) | 20.177221 L/100km |
| 15 mpg (UK) | 18.832073 L/100km |
| 16 mpg (UK) | 17.655068 L/100km |
| 17 mpg (UK) | 16.616535 L/100km |
| 18 mpg (UK) | 15.693394 L/100km |
| 19 mpg (UK) | 14.867426 L/100km |
| 20 mpg (UK) | 14.124054 L/100km |
| 21 mpg (UK) | 13.45148 L/100km |
| 22 mpg (UK) | 12.840049 L/100km |
| 23 mpg (UK) | 12.281786 L/100km |
| 24 mpg (UK) | 11.770045 L/100km |
| 25 mpg (UK) | 11.299244 L/100km |
| 26 mpg (UK) | 10.864657 L/100km |
| 27 mpg (UK) | 10.462263 L/100km |
| 28 mpg (UK) | 10.08861 L/100km |
| 29 mpg (UK) | 9.740727 L/100km |
| 30 mpg (UK) | 9.416036 L/100km |
| 31 mpg (UK) | 9.112293 L/100km |
| 32 mpg (UK) | 8.827534 L/100km |
| 33 mpg (UK) | 8.560033 L/100km |
| 34 mpg (UK) | 8.308267 L/100km |
| 35 mpg (UK) | 8.070888 L/100km |
| 36 mpg (UK) | 7.846697 L/100km |
| 37 mpg (UK) | 7.634624 L/100km |
| 38 mpg (UK) | 7.433713 L/100km |
| 39 mpg (UK) | 7.243105 L/100km |
| 40 mpg (UK) | 7.062027 L/100km |
| 41 mpg (UK) | 6.889783 L/100km |
| 42 mpg (UK) | 6.72574 L/100km |
| 43 mpg (UK) | 6.569328 L/100km |
| 44 mpg (UK) | 6.420025 L/100km |
| 45 mpg (UK) | 6.277358 L/100km |
| 46 mpg (UK) | 6.140893 L/100km |
| 47 mpg (UK) | 6.010236 L/100km |
| 48 mpg (UK) | 5.885023 L/100km |
| 49 mpg (UK) | 5.76492 L/100km |
| 50 mpg (UK) | 5.649622 L/100km |
| 60 mpg (UK) | 4.708018 L/100km |
| 70 mpg (UK) | 4.035444 L/100km |
| 80 mpg (UK) | 3.531014 L/100km |
| 90 mpg (UK) | 3.138679 L/100km |
| 100 mpg (UK) | 2.824811 L/100km |
Frequently asked questions
How many Liters per 100km are in 1 Miles per Gallon (UK)?
1 mpg (UK) equals 282.481088 L/100km.
How do I convert Miles per Gallon (UK) to Liters per 100km?
Multiply the mpg (UK) value by 282.481088. Example: 25 mpg (UK) = 11.299244 L/100km.
What is 2.5 mpg (UK) in L/100km?
2.5 mpg (UK) = 112.992435 L/100km.
Is the mpg (UK) to L/100km conversion exact?
No: fuel economy has inverse units. Litres per 100 km and gallons per mile fall as efficiency rises, so the conversion divides rather than multiplies.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.