Cups to US Gallons Converter

How to convert Cups to US Gallons

To convert Cups to US Gallons, multiply the value in Cups by 0.062499967. For example, 5 cup = 0.31249983 gal.

The Cups-to-US Gallons conversion comes up often in everyday and professional contexts alike. With 1 cup equal to 0.062499967 gal, you can use the tool above for any value, or scan the table below for the most common Cups amounts and their US Gallons equivalents.

Volume conversions are essential in the kitchen, in science, and in any situation involving liquids or capacity. They're also one of the trickiest areas because US and UK (imperial) measurements share names but differ in size.

Understanding Cups and US Gallons

A US gallon (3.785 liters) is noticeably smaller than a UK gallon (4.546 liters) — about 20% less. The same applies to pints, quarts, and fluid ounces. Cups, tablespoons, and teaspoons are the backbone of recipe measurement, while liters and milliliters dominate scientific and most international contexts. This US/UK split is the single biggest source of error in volume conversion.

How accurate is this conversion?

Volume conversions here use the internationally accepted definitions: the US gallon is exactly 3.785411784 liters and the imperial gallon is exactly 4.54609 liters. Always confirm which system a recipe or specification uses before converting.

All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.

Quick reference: common Cups to US Gallons values

The most frequently searched conversions are 1 Cups = 0.062499967 US Gallons, 5 Cups = 0.31249983 US Gallons, 10 Cups = 0.62499967 US Gallons, and 100 Cups = 6.2499967 US Gallons. The full table further down covers every common value, and the calculator handles any number you need in between.