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Fuel Economy Converter: Convert Units Online

This free fuel economy converter converts 4 units, including litres per 100 km, miles per us gallon and miles per imperial gallon. Type a value, choose the units and read the answer, plus the value in every other unit.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is It and When Do You Need It?

Fuel economy tells you how far a vehicle travels on a given amount of fuel. Europe and India mostly use litres per 100 kilometres or kilometres per litre, while the US and UK use miles per gallon, and the two gallons are not the same size.

This converter handles 4 units for litres per 100 km and shows the result in all of them at once, so you rarely need a second lookup.

How to Use This Tool

  1. Type the value you want to convert.
  2. Choose the unit you have in the From list.
  3. Choose the unit you want in the To list.
  4. Press Convert and read the answer and the table of every unit.

How the Calculation Works

Every unit is stored as a multiple of one reference unit (the litres per 100 km). To convert, the value is multiplied into the reference unit and then divided by the size of the target unit. Fuel economy is reciprocal: a lower litres-per-100-km figure is a higher miles-per-gallon figure, so the tool converts through litres per 100 km.

Worked Example

You enterYou get
1 L/100km235.21458 mpg (US)
10 L/100km28.248094 mpg (UK)
100 mpg (US)2.3521458 L/100km

Reference values:

FromTo
1 Litres per 100 km235.21458 mpg (US)
1 Litres per 100 km282.48094 mpg (UK)
1 Litres per 100 km100 km/L

Common Uses

  • Comparing cars advertised in different countries.
  • Estimating trip fuel cost.
  • Converting a manual or review to your local unit.
  • Checking claimed efficiency.

Tips and Common Mistakes

  • For litres per 100 km, a lower number is better. For mpg and km/L, a higher number is better.
  • US and UK miles per gallon differ by about 20 percent.
  • Use the table under the answer to see the same value in every unit.

Next, you may need the flow rate converter, density converter, illuminance converter, radioactivity converter.

Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.

Frequently Asked Questions

Choose litres per 100 km in the From list and miles per us gallon in the To list, type your value and press Convert. For example 1 L/100km equals 235.21458 mpg (US).
It uses the exact or standard definitions of each unit and shows up to ten significant digits. It is suitable for school, cooking, travel, engineering estimates and general use.
Yes. Decimals, commas and scientific notation such as 1.5e6 are accepted. Very large and very small results are shown in scientific notation.
No. The conversion runs in your browser and nothing is sent to us.

Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.