US Gallons to US Quarts Converter

How to convert US Gallons to US Quarts

To convert US Gallons to US Quarts, multiply the value in US Gallons by 3.9999979. For example, 5 gal = 19.999989 qt.

If you need to convert from US Gallons to US Quarts, the key figure to remember is that one US Gallons equals 3.9999979 US Quarts. This page gives you a live calculator, a full reference table, and the underlying formula so you can convert gal to qt with complete confidence.

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 US Gallons and US Quarts

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 US Gallons to US Quarts values

The most frequently searched conversions are 1 US Gallons = 3.9999979 US Quarts, 5 US Gallons = 19.999989 US Quarts, 10 US Gallons = 39.999979 US Quarts, and 100 US Gallons = 399.99979 US Quarts. The full table further down covers every common value, and the calculator handles any number you need in between.