Four quarts is equal to 1 gallon. It is also the equivalent of 128 ounces, 16 cups and 8 pints. It takes 768 teaspoons to equal 4 quarts and 168 tablespoons.
Most recipes in the United States use the above U.S. customary units borrowed from the imperial system of measurement to measure volume. Most recipes in other industrialized nations use units of volume from the metric system, such as liters and milliliters. In converting from one system to the other, it is helpful to know that 1.06 liters equals roughly 1 quart, so 4 quarts is also equivalent to approximately 4.24 liters.