How to Convert mL to Gallons

Instructor: Artem Cheprasov
In this lesson you will learn how to convert milliliters into gallons using the relationships between the metric system, the U.S. customary units, and the British imperial units.

Steps to Solve

The unit of 'mL' is spelled out as 'milliliter.' 'Milli-' means 'one-thousandth.' A mL is a metric system unit, the kind of measurement system that's used in most of the world. A mL is a unit of volume.

Like a mL, a gallon is also a unit of volume. However, it is not a metric unit. A gallon is a unit of volume in the United States customary system of units.

To convert from mL to gallons, use the following steps:

Step 1

Know that 1 U.S. gallon = 3785.41 mL, which you can also find if you search for it on Google.

Step 2

Divide the number of mL you have by 3785.41 to get your answer in gallons. Let's say that you have 5,000 mL. How many gallons is that? Using the two steps above, you should write out your problem as:

(5,000 mL) / ( 3785.41 mL/gallon)

British Gallons

Please note, we defined a gallon by US customary units. However, it can also be defined using the British imperial system of measurement. In that case:

1 gallon = 4546.09 mL


When using U.S. customary units:

(5,000 mL) / ( 3785.41 mL/gallon) = 1.32 gallons

When using British Imperial units:

(5,000 mL) / (4546 mL/gallon) = 1.10 gallons


How would we use all of this in the real world? Well, let's say that you fill up your car with gas in the U.S. at a price of $3/gallon. Then, the next day you travel to a country called Mando, where you see the price of gas listed as $0.95/liter. Assume both countries use the same currency.

Which country has the more expensive gasoline?

Well, Mando sells its gas at $0.95/liter. As you learned before, a 'milli-' is one thousandth of something. Thus a milliliter is one-thousandth of a liter. In other words, there are 1,000 milliliters/liter. That means you are paying $0.95 per 1,000 milliliters of gas:

$0.95/liter = $0.95/1,000 mL

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