Cups to Gallons Converter

Sixteen U.S. cups make a gallon. Use it to scale recipes for drinks, soups and party batches.

How to use the Cups to Gallons Converter

1. Type the number of US cups into the US cups field. Decimals such as 8 are fine.
2. Read the answer in US gallons – it updates as you type, with no button to press.
3. To convert the other way, type into US gallons and the US cups 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 cup ⇄ US gal. 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 cup equals 0.0625 US gallons. The calculator multiplies the number of US cups you type by 0.0625 to give US gallons, and when you type into the US gallons field it divides by the same factor to give US cups. Because the ratio never changes, doubling the US cups always doubles the US gallons. 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 cups to US gallons

1. Write down the value in US cups, for example 16 US cup.
2. Multiply by the conversion factor 0.0625 (because 1 US cup = 0.0625 US gal).
3. 16 × 0.0625 = 1 US gal.
4. To go back from US gallons to US cups, divide by 0.0625 – or multiply by 16.

US cup to US gal conversion table

What is a US cup?

The U.S. customary cup is 8 U.S. fluid ounces, about 236.6 mL. Recipes from Australia, Canada and New Zealand often use the 250 mL metric cup instead.

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.

Quick mental conversion

For a fast estimate, multiply US cups by about 0.062 to get US gallons; the error is about 0.8%. Use the calculator above when you need the exact figure.

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.