Gallons to Quarts Converter

A gallon is four quarts; the name quart comes from “quarter gallon”. Engine oil and paint are often sold in both sizes.

How to use the Gallons to Quarts Converter

1. Type the number of US gallons into the US gallons field. Decimals such as 0.5 are fine.
2. Read the answer in US quarts – it updates as you type, with no button to press.
3. To convert the other way, type into US quarts and the US gallons are recalculated.
4. Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.

This page converts only US gal ⇄ US qt. Need a different unit? Use the general volume converter, where you can choose any “from” and “to” unit.

How it works

Both units measure volume, so they are always in the same ratio: one US gallon equals 4 US quarts. The calculator multiplies the number of US gallons you type by 4 to give US quarts, and when you type into the US quarts field it divides by the same factor to give US gallons. Because the ratio never changes, doubling the US gallons always doubles the US quarts. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).

How to convert US gallons to US quarts

1. Write down the value in US gallons, for example 1 US gal.
2. Multiply by the conversion factor 4 (because 1 US gallon = 4 US qt).
3. 1 × 4 = 4 US qt.
4. To go back from US quarts to US gallons, divide by 4 – or multiply by 0.25.

US gal to US qt conversion table

What is a US gallon?

The U.S. liquid gallon is exactly 231 cubic inches, about 3.785 litres. It is used for fuel, milk, water and paint in the United States.

What is a US quart?

A U.S. quart is a quarter of a gallon, about 946 mL. Engine oil, ice cream and soups are often sold by the quart.

Common mistakes to avoid

Mixing u.s. and uk gallons, pints and fluid ounces, assuming a cup is always 250 ml, and treating volume and weight as interchangeable for anything except water.