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MPG to Litres per 100 km Calculator

Convert US miles per gallon into the litres-per-100-km figure used across Europe and Australia.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Fuel consumption

9.41 L/100 km

High confidence

L/100 km = 235.215 ÷ mpg. The constant is 3.785411784 L per US gallon divided by 1.609344 km per mile, times 100. The constant is exact. Real-world consumption varies with load, terrain, tyre pressure and driving far more than any rounding here.

US mpg entered
25 mpg
Imperial mpg (UK)
30.02 mpg (imp)
km per litre
10.63 km/L

Plant and vehicle fuel budgets cross this boundary constantly — an American-specified machine working to a European fuel account, or a fleet quoted in one unit and invoiced in the other. The reciprocal relationship is also the reason a fleet manager should treat a 2 mpg gain on a truck as worth far more than the same gain on a van.

Add the equipment this sizes

This result is a specification — 9.409 L/100 km — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • 1 US gallon = 3.785411784 L (exact); 1 mile = 1.609344 km (exact)
  • 1 imperial gallon = 1.20095 US gallons, from the exact litre definitions

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why is this a division rather than a multiplication?
Because the two units measure opposite things. Miles per gallon is distance per unit of fuel; litres per 100 km is fuel per unit of distance. One is the reciprocal of the other, which is why doubling mpg halves L/100 km rather than doubling it.
Is a UK mpg figure the same number?
No, and the gap is large. An imperial gallon is about 20% bigger than a US one, so the same vehicle scores roughly 20% higher in UK mpg. A car advertised at 40 mpg in Britain is about 33 mpg in the United States. The breakdown shows both.
Why do small mpg improvements matter more at the bottom of the range?
Because of the reciprocal. Going from 10 to 12 mpg saves far more fuel over the same distance than going from 40 to 42, even though both are a 2 mpg gain. This is the practical argument for concentrating efficiency effort on the thirstiest vehicle in a fleet, and it is invisible if you only ever look at mpg.
Which figure should I use for costing a job?
Whichever your fuel is sold in. Litres per 100 km multiplies straight into a litre price and a route distance; mpg needs a conversion first. For a fleet crossing between metric and imperial markets, cost in the local unit and convert the money, not the consumption.