Cups to Gallons Converter

About the cup to gal calculation

One cup is exactly 0.0625 gallons, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The US legal cup is 240 ml; the customary cup used in recipes is 236.6 ml. The US gallon is 3.785 L. The imperial gallon is 4.546 L — a 20% difference.

Formula

gal = cup × 0.0625

1 cup = 0.0625 gal
1 gal = 16 cup

Worked example

To convert 1 cup, multiply by 0.0625: 1 × 0.0625 = 0.0625 gal.

Frequently asked questions

How many gallons are in a cup?

There are 0.0625 gallons in one cup. To convert any amount, multiply the number of cups by 0.0625.

How do I convert gallons back to cups?

Divide instead of multiplying, or equivalently multiply by 16. One gallon is 16 cups.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between cups and gallons 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?

Cups: the US legal cup is 240 ml; the customary cup used in recipes is 236.6 ml. Gallons: the US gallon is 3.785 L. The imperial gallon is 4.546 L — a 20% difference.

Sources

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