SettingsSettings for this calculationUS
Fuel consumption in litres per 100 kilometres.
This is an inverse measure — lower is better — whereas MPG is a direct one where higher is better. That inversion is why the conversion is a division rather than a multiplication.
Fuel economy
23.52 US MPG
MPG = 235.215 ÷ (L/100km). The two are reciprocal measures, not proportional ones. Imperial MPG uses a different constant — a UK figure and a US figure for the same vehicle will not match.
They open the calculator with your figures already in it
L/100km to MPG Calculator: 23.52 US MPG — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- US MPG = 235.214583 / (L/100km), derived from 1 US gallon = 3.785411784 L and 1 mile = 1.609344 km
- Imperial MPG uses 282.481 instead, because an imperial gallon is larger
Inputs used
- Fuel consumption (L/100km)
- 10
Confidence note: MPG = 235.215 ÷ (L/100km). The two are reciprocal measures, not proportional ones. Imperial MPG uses a different constant — a UK figure and a US figure for the same vehicle will not match.
What this calculation does not cover
- The relationship is RECIPROCAL, so MPG figures cannot be averaged. Convert to litres per 100 km, average there, and convert back.
- This returns US MPG. An imperial gallon is about 20% larger, so a UK figure converted from the same consumption is about 20% higher.
Add the equipment this sizes
This result is a specification — 23.52 US MPG — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-08-26 · in the site-wide review of 2026-09-06 · v1.0.0
Regulatory standards & verification citations2
- US MPG = 235.214583 / (L/100km), derived from 1 US gallon = 3.785411784 L and 1 mile = 1.609344 km
- Imperial MPG uses 282.481 instead, because an imperial gallon is larger
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Fleet and plant running costs cross this boundary whenever equipment is specified in one market and operated in another. The conversion is a reciprocal rather than a multiplier, which is the part that trips people up: litres per hundred kilometres measures consumption where less is better, while miles per gallon measures economy where more is better, so the relationship inverts. Halving fuel consumption doubles the MPG figure. The other reliable confusion is which gallon: US MPG uses a constant of 235.2 and imperial MPG 282.5, so identical vehicles score about twenty percent apart depending on which convention the figure came from, and UK published figures are almost always imperial.