Fuel Consumption Calculator Mpg to L 100km

Understanding fuel consumption in different units is essential for comparing vehicle efficiency. This calculator converts between miles per gallon (MPG) and liters per 100 kilometers (L/100km), the two most common fuel efficiency measurements used worldwide.

Conversion Formula

The relationship between MPG and L/100km is based on the conversion between miles and kilometers, and gallons and liters. The exact formula is:

L/100km = 235.215 / MPG

This formula accounts for:

1 gallon ≈ 3.78541 liters
1 mile ≈ 1.60934 kilometers
235.215 is the conversion factor derived from these relationships

For reverse calculation (L/100km to MPG):

MPG = 235.215 / L/100km

How to Use This Calculator

Enter your fuel consumption in either MPG or L/100km
Click "Calculate" to see the equivalent value
Review the result and interpretation
Use the "Reset" button to start over

The calculator provides instant conversion and includes a visual comparison chart when both values are available.

Common Fuel Consumption Units

Different countries use different units for measuring fuel efficiency:

Unit	Description	Common in
MPG	Miles per gallon	United States, United Kingdom
L/100km	Liters per 100 kilometers	Europe, Australia, most of the world
km/L	Kilometers per liter	Some European countries

Understanding these units helps when comparing vehicle specifications from different regions.

Example Calculations

Let's look at some practical examples:

Example 1: Converting MPG to L/100km

A vehicle gets 30 MPG. What is this in L/100km?

L/100km = 235.215 / 30 ≈ 7.84 L/100km

This means the vehicle consumes about 7.84 liters of fuel for every 100 kilometers traveled.

Example 2: Converting L/100km to MPG

A European car has a fuel consumption of 5.5 L/100km. What is this in MPG?

MPG = 235.215 / 5.5 ≈ 42.77 MPG

This indicates the car is more fuel-efficient than the previous example.

Frequently Asked Questions

Why do different countries use different fuel consumption units?: Historical reasons and measurement systems evolved differently in various regions. The metric system is used in most of the world, while the US and UK use imperial units.
Is L/100km better than MPG?: Neither unit is inherently better. L/100km is more intuitive for metric users as it directly shows fuel consumption per distance unit. MPG is more familiar in the US and UK.
How accurate is this conversion?: The conversion uses standard unit relationships and provides precise results. The slight rounding in the formula (235.215) accounts for the exact conversion between gallons and liters, and miles and kilometers.
Can I use this calculator for diesel vehicles?: Yes, the calculator works for any liquid fuel vehicle. The same conversion principles apply regardless of the fuel type.
What if I have fuel consumption in km/L?: You can first convert km/L to L/100km by taking the reciprocal (1 / km/L), then use this calculator to convert to MPG.