My car gets 30 MPG. What is that in L/100km?

235.214583 / 30 = approximately 7.84 L/100km.

Why is the conversion factor 235.214583?

It combines 1.609344 km per mile and 3.785411784 liters per US gallon with the 100 km reference distance into one constant.

Can I convert L/100km back to MPG?

Yes. MPG = 235.214583 / (L/100km). The same constant works in reverse because the relationship is a simple reciprocal.

MPG to Liters per 100 km Calculator

Convert fuel economy from miles per gallon (MPG) to liters per 100 kilometers (L/100km). Enter MPG to get the equivalent metric fuel consumption figure used in Canada, Europe, and Australia.

By AbraCalc Editorial Team · Reviewed by AbraCalc Methodology Review · Last reviewed: 2026-06-25

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How to use this tool

Enter miles per gallon (mpg) in the fields above.
Results update instantly as you type — or click Calculate.
Read your liters per 100 km and the full breakdown beneath it.

Formula

L/100km = 235.214583 / MPG

How it works

The conversion constant 235.214583 comes from the number of liters per US gallon (3.785411784) multiplied by 100 km per 62.13712 miles. Divide this constant by the MPG value to get L/100km.

Worked example

Convert 30 MPG to L/100km

L/100km = 235.214583 / 30 = 7.8405 L/100km

Common mistakes to avoid

Confusing US MPG with UK (Imperial) MPG; UK gallons are larger, so UK MPG values are about 20% higher than US MPG for the same vehicle.
Interpreting a lower L/100km result as worse fuel economy; L/100km is an inverse scale, so a smaller number means better efficiency.
Rounding MPG before converting, which introduces noticeable error at low MPG values where the L/100km curve is steep.

Key terms

Frequently asked questions

My car gets 30 MPG. What is that in L/100km?: 235.214583 / 30 = approximately 7.84 L/100km.
Why is the conversion factor 235.214583?: It combines 1.609344 km per mile and 3.785411784 liters per US gallon with the 100 km reference distance into one constant.
Can I convert L/100km back to MPG?: Yes. MPG = 235.214583 / (L/100km). The same constant works in reverse because the relationship is a simple reciprocal.