Fuel Consumption Converter

ConversionEdited by Hemant Kumar and Anjita Rai, founders · How we checkUpdated Free · No sign-up

Quick answer: Choose a starting unit and a target unit, then enter a value. Common conversions: 1 L/100 km = 235.2146 mpg (US); 1 km/L = 2.352146 mpg (US); 1 km/L = 2.824809 mpg (UK). This converter covers 6 fuel consumption units.

Use the Fuel Consumption Converter

Fuel Consumption formula and what each symbol means

Convert the value to km/L with the unit rule in the table, then convert from km/L to the target unit.

Symbols used in the formula
SymbolMeaning
valueThe number you want to convert
factorThe unit’s size expressed in the base unit (km/L)

Fuel Consumption examples

L/100 km to mpg (US)

25 L/100 km = 9.408583 mpg (US).

km/L to mpg (US)

25 km/L = 58.80365 mpg (US).

km/L to mpg (UK)

25 km/L = 70.62023 mpg (UK).

How to calculate Fuel Consumption step by step

  1. Choose the starting unit and the target unit.
  2. Enter your value.
  3. Read the converted value; the tool applies each unit’s scale and offset through the base unit.

Popular fuel consumption conversions

How to read your Fuel Consumption result

Fuel economy can be written as distance per volume (km/L, mpg) or volume per distance (L/100 km). The two are reciprocals, so conversion between them is division rather than multiplication. US and UK miles per gallon differ because the gallons differ.

UNITSYMBOLEQUALSVALUE OF 1 KM/L
Kilometer per literkm/L1 km/L = 1 km/L1 km/L
Mile per litermi/L1 mi/L = 1.609344 km/L0.6213712 mi/L
Mile per US gallonmpg (US)1 mpg (US) = 0.42514371 km/L2.352146 mpg (US)
Mile per imperial gallonmpg (UK)1 mpg (UK) = 0.35400619 km/L2.824809 mpg (UK)
Liter per 100 kilometersL/100 kmkm/L = 100 ÷ L/100 km100 L/100 km
US gallon per 100 milesgal/100 mikm/L = 235.21458 ÷ gal/100 mi235.2146 gal/100 mi

Common mistakes when calculating Fuel Consumption

  • Using mpg (US) and mpg (UK) as the same: 1 UK mpg is about 1.2 US mpg.
  • Multiplying instead of dividing when switching between L/100 km and km/L or mpg.
  • Comparing a car quoted in L/100 km with another in mpg without converting.

Fuel Consumption FAQ

How do I convert mpg to L/100 km?

Divide 235.215 by the mpg (US) value.

How do I convert km/L to L/100 km?

Divide 100 by the km/L value.

Why is UK mpg higher than US mpg?

The imperial gallon is about 20% larger than the US gallon.

What is the base unit for fuel consumption?

This converter uses kilometer per liter (km/L) as the common base unit: every value is first converted to it and then to the target unit.

How do I convert between two fuel consumption units?

These units do not share a simple multiplier, so each conversion goes through the base unit using the formula shown in the table.

How many MPG are in 1 liter per 100 kilometers?

1 L/100 km = 235.2146 mpg (US).

How many MPG are in 1 kilometer per liter?

1 km/L = 2.352146 mpg (US).

How many MPG are in 1 kilometer per liter?

1 km/L = 2.824809 mpg (UK).

Which fuel consumption units does this converter support?

It covers 6 units: kilometer per liter (km/L), mile per liter (mi/L), Mile per US gallon (mpg (US)), mile per imperial gallon (mpg (UK)), liter per 100 kilometers (L/100 km), US gallon per 100 miles (gal/100 mi).

How accurate is the fuel consumption converter?

Results are calculated at full double precision and shown to about 8 significant figures. Round the answer to the precision of your original measurement; a result cannot be more accurate than the number you started with.

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Method, review and disclaimer

Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors