Gallons to Milliliters Converter

About the gal to ml calculation

One gallon is exactly 3,785.41 milliliters, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The US gallon is 3.785 L. The imperial gallon is 4.546 L — a 20% difference. The everyday unit for drinks, medicine doses and recipe liquids.

Formula

ml = gal × 3,785.41

1 gal = 3,785.41 ml
1 ml = 0.00026417 gal

Worked example

To convert 1 gal, multiply by 3,785.41: 1 × 3,785.41 = 3,785.41 ml.

Frequently asked questions

How many milliliters are in a gallon?

There are 3,785.41 milliliters in one gallon. To convert any amount, multiply the number of gallons by 3,785.41.

How do I convert milliliters back to gallons?

Divide instead of multiplying, or equivalently multiply by 0.00026417. One milliliter is 0.00026417 gallons.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between gallons and milliliters is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Where is each of these units used?

Gallons: the US gallon is 3.785 L. The imperial gallon is 4.546 L — a 20% difference. Milliliters: the everyday unit for drinks, medicine doses and recipe liquids.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units