Gallons to Cups Converter

About the gal to cup calculation

One gallon is exactly 16 cups, 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 US legal cup is 240 ml; the customary cup used in recipes is 236.6 ml.

Formula

cup = gal × 16

1 gal = 16 cup
1 cup = 0.0625 gal

Worked example

To convert 1 gal, multiply by 16: 1 × 16 = 16 cup.

Frequently asked questions

How many cups are in a gallon?

There are 16 cups in one gallon. To convert any amount, multiply the number of gallons by 16.

How do I convert cups back to gallons?

Divide instead of multiplying, or equivalently multiply by 0.0625. One cup is 0.0625 gallons.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between gallons and cups 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. Cups: the US legal cup is 240 ml; the customary cup used in recipes is 236.6 ml.

Sources

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