How many US gallons are in a US cup?

1 cup = 0.0625 gal. To convert any amount, multiply by 0.0625.

How do you convert US cups to US gallons?

Multiply the number of US cups by 0.0625 to get US gallons. The formula is shown in the "How it's calculated" section above.

Where does the conversion factor come from?

It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.

Unit converter — Volume

US cups to US gallons converter

Convert US cups (cup) to US gallons (gal). Source-cited conversion factor, exact to the displayed precision.

Results are mathematically exact for the displayed precision. How we calculate.

How it's calculated

Convert US cups to US gallons— the formula

US cups convert to US gallons by multiplying by the published conversion factor. The factor below is exact to the precision shown, sourced from the citation under the formula.

gal = cup × 0.0625

cup = gal × 16

Metric volumes per BIPM SI definitions. US customary volumes per NIST Handbook 44: 1 US gal = 3.785411784 L exactly; 1 fl oz = 1/128 US gal.

Questions

Frequently asked questions

How many US gallons are in a US cup?
1 cup = 0.0625 gal. To convert any amount, multiply by 0.0625.
How do you convert US cups to US gallons?
Multiply the number of US cups by 0.0625 to get US gallons. The formula is shown in the "How it's calculated" section above.
Where does the conversion factor come from?
It's a published international standard. Most are defined exactly by international agreement (e.g. 1 inch = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Source citations are listed under the formula above.