How do I convert MPG (UK) to L/100mi?

Use the formula shown above or enter a value to see MPG (UK) converted to L/100mi instantly.

What is the formula for MPG (UK) to L/100mi?

The converter calculates L/100mi by applying the category-specific conversion factor for Fuel Economy.

When should I use MPG (UK) vs L/100mi?

MPG (UK) and L/100mi are both part of the Fuel Economy category; pick the unit that matches your measurement context (e.g., scale, region, or industry standard).

Fuel Economy & Efficiency Reference

Convert MPG (UK) to L/100mi

Use the live converter below to translate between Mile per Gallon (UK) (MPG (UK)) and Liter per 100 miles (L/100mi). Scroll further for quick examples, formula tips, and related units.

Formula insight: Converting between efficiency (km/L, MPG) and consumption (L/100km) units requires using the inverse relationship: consumption = 100 ÷ efficiency.

Convert

MPG (UK) → L/100mi

Mile per Gallon (UK)

MPG (UK)

Liter per 100 miles

454.609

L/100mi

Rounded result (4 decimals max)

Formula

1 MPG (UK) = 454.609 L/100mi

Conversion sourcesTap or click to view references

The International System of Units (SI) — NIST Special Publication 330
National Institute of Standards and Technology (NIST). The SI Brochure (SP 330) is the definitive English edition of the BIPM SI tables. NIST’s edition lists the official constants and conversion factors tying inch-pound units to SI, which SwapUnits applies for length, mass, temperature, pressure, volume, and related conversions. See /standards/nist-si-tenfold for the complete decimal multiple/submultiple table. View source · View SI table
Fuel Economy Guide (Model Year 2024)
U.S. Environmental Protection Agency & U.S. Department of Energy. Describes how MPG, km/L, and L/100 km ratings are calculated for the U.S. Monroney label and how to interpret efficiency versus consumption metrics. View source

Results update as you type. Swap the direction to convert back from L/100mi to MPG (UK).

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MPG (UK) to L/100mi quick table

Multiply any row by the same factor to scale results. Use the converter above to enter exact values with your own units.

Mile per Gallon (UK) (MPG (UK))	Liter per 100 miles (L/100mi)
2 MPG (UK)	227.3045 L/100mi
4 MPG (UK)	113.6523 L/100mi
6 MPG (UK)	75.7682 L/100mi
8 MPG (UK)	56.8261 L/100mi
10 MPG (UK)	45.4609 L/100mi
15 MPG (UK)	30.3073 L/100mi
20 MPG (UK)	22.7305 L/100mi

L/100mi back to MPG (UK)

Keep the reciprocal handy when double-checking calculations or undoing a conversion.

Liter per 100 miles (L/100mi)	Mile per Gallon (UK) (MPG (UK))
2 L/100mi	227.3045 MPG (UK)
4 L/100mi	113.6523 MPG (UK)
6 L/100mi	75.7682 MPG (UK)
8 L/100mi	56.8261 MPG (UK)
10 L/100mi	45.4609 MPG (UK)
15 L/100mi	30.3073 MPG (UK)
20 L/100mi	22.7305 MPG (UK)