Using the US liquid standard: 1 gallon = 4 quarts exactly, so 1 quart = 0.25 gallons.
1 US liquid quart is approximately 0.946 litres, and 1 US liquid gallon is approximately 3.785 litres.
US liquid quarts are the standard for beverages, paint, motor oil, and most everyday cooking in the United States.
Next stepNeed to convert to other units? This converter also shows the equivalent in pints, litres, and cups so you can cross-check across measurement systems.