MPG to L/100kmFree online conversion calculator — instant results, no sign-up
Convert US miles per gallon to liters per 100 km.
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About the MPG to L/100km
The MPG to L/100km calculator converts US miles per gallon into liters of fuel consumed per 100 kilometers. It uses an inverse relationship: higher US mpg corresponds to lower L/100km. With the default input of 1 mpg, the result is 235.215 L/100km.
- Value in mpg (mpg)
- Enter fuel economy in miles traveled per US gallon of fuel (mpg); the default value is 1.
Formula and method
L/100km = 235.214583 ÷ mpg
- L/100kmFuel consumption expressed as liters used to travel 100 kilometers.
- mpgInput fuel economy expressed as miles traveled per US gallon.
- 235.214583Conversion constant combining the US gallon-to-liter and mile-to-kilometer conversions with the 100-kilometer reporting distance.
Divide 235.214583 by the entered US mpg value to obtain fuel consumption in L/100km. For the default input, 235.214583 ÷ 1 = 235.214583 L/100km, displayed as 235.215 L/100km after rounding to three decimal places.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Value in mpg1 mpg
Results
- L/100km235.215
- 1 mpg =235.215 L/100km inverse
- FormulaL/100km = 235.214583 ÷ mpg
How to use the MPG to L/100km
- 1Confirm that your fuel-economy figure uses US gallons, not Imperial gallons.
- 2Enter a positive number in Value in mpg (mpg), or leave the default value of 1.
- 3Calculate the conversion using L/100km = 235.214583 ÷ mpg.
- 4Read the consumption result; the default input produces 235.215 L/100km.
- 5Review the equivalence and formula rows to confirm the input, units, and inverse relationship.
Reading your result
The result row, “L/100km = 235.215,” means that the default fuel economy corresponds to consuming 235.215 liters over 100 kilometers. The equivalence row, “1 mpg = = 235.215 L/100km inverse,” states the same conversion; the repeated equals sign is a display artifact, and “inverse” indicates that L/100km decreases as mpg increases. The formula row, “L/100km = 235.214583 ÷ mpg,” shows the calculation rule. Lower L/100km indicates lower fuel consumption per distance, whereas higher mpg indicates greater distance traveled per unit of fuel.
Limitations
This calculator assumes US liquid gallons and is not suitable for directly converting Imperial mpg. The input must be finite and greater than zero: zero causes division by zero, and negative mpg is not physically meaningful here. The displayed result is rounded, and the conversion constant is given to six decimal places. This is a unit conversion, not a prediction of real-world consumption; its accuracy depends on the supplied mpg figure and does not account for changes in driving conditions.
Common questions
Can I enter UK or Imperial mpg into this calculator?+
No. This tool uses US gallons, which differ in volume from Imperial gallons. Convert your figure to US mpg first or use a calculator explicitly designed for Imperial mpg.
Why does increasing mpg decrease L/100km?+
MPG measures distance per unit of fuel, while L/100km measures fuel per fixed distance. Because mpg is the divisor in 235.214583 ÷ mpg, increasing it reduces the L/100km result.
Why does the default input of 1 mpg show 235.215 L/100km?+
Dividing the conversion constant 235.214583 by 1 gives 235.214583 L/100km. Rounding that value to three decimal places gives 235.215 L/100km.
Does the “inverse” label mean I should invert the displayed result again?+
No. The displayed L/100km value is already the converted result. The label describes the reciprocal relationship between mpg and L/100km, not an additional calculation you need to perform.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
Further reading
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Results are estimates for informational purposes and are not financial, medical or legal advice.