US Quarts to UK Gallons Converter

How to convert US Quarts to UK Gallons

To convert US Quarts to UK Gallons, multiply the value in US Quarts by 0.20816856. For example, 5 qt = 1.0408428 gal.

Going from US Quarts to UK Gallons means applying a fixed conversion factor: one US Quarts (qt) is exactly 0.20816856 UK Gallons (gal). Type any number into the converter above and the equivalent updates instantly, or use the reference table for quick lookups.

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 Quarts and UK 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 US Quarts to UK Gallons values

The most frequently searched conversions are 1 US Quarts = 0.20816856 UK Gallons, 5 US Quarts = 1.0408428 UK Gallons, 10 US Quarts = 2.0816856 UK Gallons, and 100 US Quarts = 20.816856 UK Gallons. The full table further down covers every common value, and the calculator handles any number you need in between.