Mpg to L/100km Converter – Formula & Table

These two units are reciprocals, so the conversion is a division, never a multiplication: L/100km = 235.214583 ÷ mpg. Worked example: 30 mpg equals 7.84 L/100km. Miles per gallon and liters per 100 km disagree in direction as well as units: a higher mpg number means better economy, while a higher L/100 km figure means worse — the scales run opposite ways. The bridge is a reciprocal, not a factor: L/100 km = 235.214583 ÷ mpg, derived from one US gallon (3.7854118 L) crossing 1.609344 km per mile, so division — never multiplication — converts between them. The reverse divides the same constant: mpg = 235.214583 ÷ (L/100km), and 7.84 L/100km returns 30 mpg. Mini table: 5 mpg = 47.04 L/100km; 10 mpg = 23.52 L/100km; 25 mpg = 9.41 L/100km; 50 mpg = 4.7 L/100km. Anchors translate instantly: 30 mpg ≈ 7.8 L/100 km, and the popular European 5.0 L/100 km hatchback would rate about 47 mpg US.

1. 1

   Step 1

   Enter your value in miles per gallon (mpg)

2. 2

   Step 2

   The tool divides 235.214583 by your mpg value

3. 3

   Step 3

   Read the result in liters per 100 km (L/100km)

4. 4

   Step 4

   Hit swap to convert liters per 100 km back to miles per gallon instantly

• 1

  Memorize 235.214583 = the mpg ↔ L/100 km pivot

• 2

  Quick anchors: 30 mpg ≈ 7.8, 40 mpg ≈ 5.9 L/100 km

• 3

  UK mpg: multiply by 1.20095 to state US mpg

• 4

  EU labels now show L/100 km — divide 282.481 by it for UK mpg

• Multiplying mpg by a factor instead of dividing 235.214583 by it

• Reading better economy into a higher L/100 km figure — the scale runs backwards

• Converting UK-mpg figures with the US-gallon constant