Miles per Gallon (Imperial) to Liters per 100 miles Converter

A value of 1 Miles per Gallon (Imperial) converts to 454.6091401 Liters per 100 miles; the two units measure the same quantity on different scales, so the relationship is not a fixed factor. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.

Formula

l-100mi = convert(mpg-imp → L100km → l-100mi)

Convert Miles per Gallon (Imperial) to the base unit (L100km), then convert to Liters per 100 miles.

Example Conversions

0 Miles per Gallon (Imperial) (mpg-imp)

Invalid Liters per 100 miles (l-100mi)

1 Miles per Gallon (Imperial) (mpg-imp)

454.6091401 Liters per 100 miles (l-100mi)

25 Miles per Gallon (Imperial) (mpg-imp)

18.1843656 Liters per 100 miles (l-100mi)

100 Miles per Gallon (Imperial) (mpg-imp)

4.546091401 Liters per 100 miles (l-100mi)

212 Miles per Gallon (Imperial) (mpg-imp)

2.144382736 Liters per 100 miles (l-100mi)

Conversion Table

Common conversion values from Miles per Gallon (Imperial) to Liters per 100 miles
Miles per Gallon (Imperial) (mpg-imp) Liters per 100 miles (l-100mi)
0 Invalid
1 454.6091401
10 45.46091401
20 22.73045701
25 18.1843656
32 14.20653563
37 12.28673352
50 9.092182802
75 6.061455201
100 4.546091401
212 2.144382736
273.15 1.664320484

How to Convert Manually

Use these steps to convert Miles per Gallon (Imperial) values to Liters per 100 miles without the calculator.

  1. Write down the value in Miles per Gallon (Imperial) (mpg-imp) that you want to convert.
  2. Apply the formula: l-100mi = convert(mpg-imp → L100km → l-100mi).
  3. For example, converting 10 Miles per Gallon (Imperial) gives 45.46091401 Liters per 100 miles.
  4. Label the result as Liters per 100 miles (l-100mi).

About Miles per Gallon (Imperial) and Liters per 100 miles

Miles per imperial gallon uses the larger UK gallon (4.54609 L), so the same car scores about 20% higher than in US mpg. UK car reviews and older Commonwealth figures use it. Liters per 100 miles mixes metric fuel volume with mile distances — a hybrid unit appearing in some North American EV and plug-in hybrid comparisons alongside gallons-per-100-miles figures. The two units are related by a formula rather than a fixed factor; a value of 1 Miles per Gallon (Imperial) corresponds to 454.6091401 Liters per 100 miles. Miles per Gallon (Imperial) to Liters per 100 miles conversion comes up most often in UK car reviews and adverts and in comparing UK and US economy figures, typically when figures need restating for EV and hybrid consumption comparisons.

Precision and Rounding: Fuel economy units are reciprocal of each other — consumption (L/100 km) falls as efficiency (mpg, km/L) rises — so conversions are formula-based, not simple factors, and small mpg differences matter more at low values than high ones. One decimal place is standard for window stickers and trip computers.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15 Miles per Gallon (Imperial) equals 30.30727601 Liters per 100 miles.

15 mpg-imp -> 30.30727601 l-100mi

FAQ

How do I convert Miles per Gallon (Imperial) to Liters per 100 miles?

Convert Miles per Gallon (Imperial) to the base unit (L100km), then convert to Liters per 100 miles.

What is the formula for Miles per Gallon (Imperial) to Liters per 100 miles?

The formula is l-100mi = convert(mpg-imp → L100km → l-100mi).

How many Liters per 100 miles are in 1 Miles per Gallon (Imperial)?

1 Miles per Gallon (Imperial) equals 454.6091401 Liters per 100 miles.

Can I convert Liters per 100 miles back to Miles per Gallon (Imperial)?

Yes. 1 Liters per 100 miles equals 454.6091401 Miles per Gallon (Imperial), and the related converter can reverse the calculation.

What are common names for Miles per Gallon (Imperial) and Liters per 100 miles?

Miles per Gallon (Imperial) is shown as mpg-imp and may also be searched as mpg imp, imperial mpg, UK mpg. Liters per 100 miles is shown as l-100mi and may also be searched as L/100mi, liters per 100 miles.

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