US Cups to Gallons Converter

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Convert US cups to US gallons using the customary 8-fl-oz cup: 16 cups = 1 US gallon (3.785 L) exactly; 8 cups = 1/2 gallon; 32 cups = 2 gallons. Useful for batch cooking, party drink quantities and large-volume recipe scaling where individual portions are measured in cups but the total tracks in gallons. Browser-local.

Cup (US)
Gallon (US)

Cup (US) → Gallon (US)

Quick reference table

Cup (US)Gallon (US)
1 cup (US)0.0625 gal (US)
2 cup (US)0.125 gal (US)
5 cup (US)0.3125 gal (US)
10 cup (US)0.625 gal (US)
25 cup (US)1.5625 gal (US)
50 cup (US)3.125 gal (US)
100 cup (US)6.25 gal (US)

Glossary

US cup

A US customary cup is exactly 8 US fluid ounces or about 236.59 ml — the value used in most US recipes and on cooking measuring cups. The US legal cup used in nutrition labelling is slightly larger at exactly 240 ml (a 1.4 % difference). This converter uses the customary 8-fl-oz cup. One cup contains 16 tablespoons or 48 teaspoons.

US gallon

A US liquid gallon is exactly 231 cubic inches, or 3.785411784 L. It is the everyday US unit for fuel, milk, paint and bulk household liquids. One US gallon contains 4 quarts, 8 pints or 128 US fluid ounces. The UK imperial gallon (≈4.546 L) is about 20 % larger and is a different unit — always check which is meant.

Metric / SI volume

In the metric system, volume is reported in liters (everyday) or cubic meters (industrial), with millilters for fine resolution. The relations are exact powers of ten: 1 m³ = 1,000 L = 1,000,000 ml, and 1 ml = 1 cm³. The metric system is the standard worldwide for science, beverages, fuel in metric countries, and most modern recipes outside the United States.

Imperial / US Customary volume

US customary and UK imperial systems both use gallon, quart, pint and fluid ounce — but with different sizes. The US gallon is 3.785 L (128 US fl oz); the UK imperial gallon is 4.546 L (160 UK fl oz). Cooking units (tsp = 4.93 ml, tbsp = 14.79 ml, cup = 240 ml) follow the US standard in nearly all modern English-language recipes.

Related tools

US Gallons to US Cups
Convert US gallons to US cups — 1 gallon = 16 cups (8-fl-oz cup)
US Cups to US Pints
Convert US cups to US pints — 2 cups ≈ 1 pint
Gallons to Liters
Convert US gallons to liters — 1 US gal = 3.7854 L
Volume Converter
Convert volumes — ml, L, m³, cups, tbsp, fl oz, US/UK gallons and pints