Fuel Economy Conversion
Convert fuel efficiency units
Features
Conversion among 37 units
Supports 37 units such as km/L and mpg
Absorbs notation differences between Japan, the US, and the UK
Covers US and UK gallons and nautical mile notation as well
Display all units instantly as you type
Just pick a base unit to list all the other units
Both fuel economy and consumption notations
Convert between km/L-type and L/100km-type units
How to use
Enter the value to convert
Enter the fuel efficiency value in the value field for instant conversion
Select the base unit
Select the unit of your input value from the base unit field
Check and copy the converted results
Check the value for each unit in the list on the right and copy it
Use cases
Comparing imported car catalogs
Convert overseas mpg figures to km/L to compare with domestic cars
Calculating refueling on overseas trips
Convert a rental car's fuel efficiency to domestic standards to understand it
Interpreting European-style fuel economy
Convert L/100km notation into fuel efficiency per distance
Conversion in technical materials and assignments
Unify figures in materials that mix multiple units
Basic Knowledge
Difference between km/L and L/100km
Japan expresses fuel efficiency as "how many kilometers can be driven per liter" (km/L), while Europe uses "how many liters are needed to drive 100km" (L/100km). These are reciprocal relationships. For example, 20km/L is exactly equivalent to 5L/100km.
What is MPG (Miles Per Gallon)?
MPG is a fuel efficiency unit used in the US and UK, measuring "how many miles can be driven per gallon". Although both use MPG, the US gallon (approximately 3.785L) and the Imperial gallon (approximately 4.546L) have different volumes, so the values cannot be directly compared between the two countries.
Fuel Cost Calculation Formula
Fuel cost can be estimated using the formula: "distance traveled ÷ fuel efficiency × price per liter of fuel". For example, if a car with 15km/L fuel efficiency travels 300km, the fuel consumed is 300 ÷ 15 = 20L.
Safety and privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
unit conversion is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
input values and converted results and input suggestions are not stored on the server.
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We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.