Gallons to Cups Converter
Enter the volume in gallons below to convert it to cups.
Convert Gallons (US) to Cups (US)
Enter a value in gallons (us) (gal (US)) to convert to cups (us) (cup).
Gallon to Cup Conversion Table
Table showing various gallon measurements converted to cups. Click any preset value or arrow to load it into the converter.
How to Convert Gallons to Cups
To convert gallons to cups, multiply the volume by the following conversion ratio: 16 cups/gallon.
Since one gallon is equal to 16 cups, you can use this simple formula to convert:
The volume in cups is equal to the volume in gallons multiplied by 16.
For example, here's how to convert 1 gallons to cups using the formula above.
How Many Cups Are in a Gallon?
There are 16 cups in a gallon, which is why we use this value in the formula above.
Our gallon to cup calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Gallons and cups are both units used to measure volume. Keep reading to learn more about each unit.
What Is a Gallon?
A gallon is a unit of volume equal to 3.7854118 liters (L), the base unit for volume. US liquid gallon defined as exactly 231 cubic inches (3.78541 L). [1]
The gallon is classified as a US customary unit of volume. Gallons can be abbreviated as gal (US); for example, 1 gallon can be written as 1 gal (US).
When working with gallons (gal (US)) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, gallons (gal (US)) are widely used across standard volume applications within US customary workflows, engineering documentation, and technical data sheets.
What Is a Cup?
A cup is a unit of volume equal to 0.2365882 liters (L), the base unit for volume. Equal to 8 US fluid ounces or 16 US tablespoons (236.59 mL). [2]
The cup is classified as a US customary unit of volume. Cups can be abbreviated as cup; for example, 1 cup can be written as 1 cup.
When working with cups (cup) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, cups (cup) are widely used across standard volume applications within US customary workflows, engineering documentation, and technical data sheets.
When converting volume between gallons (gal (US)) and cups (cup), keep full floating-point precision (1 gal (US) = 16 cup; 1 cup = 0.0625 gal (US)) during intermediate calculations and round only the final cup figure to match your instrument tolerance.
More Gallon & Cup Conversions
Need to calculate in the opposite direction? Use our cups (us) to gallons (us) converter (cup to gal (US)) to switch your starting unit immediately. You can also explore related tools such as converting tablespoons (us) to cups (us), converting liters to cups (us), or converting gallons (us) to liters.
Convert from Gallons
Weight and volume require ingredient density (g/mL). Choose a USDA FoodData Central verified ingredient below:
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Gallons (US) (gal (US)) to Cups (US) (cup)
- [2]NIST HB 44 SpecificationNIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Gallon (US Liquid) (gal (US)) & Cup (US Customary) (cup)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (gal (US) to cup)