How many quarts are in one gallon?

One gallon is equivalent to four quarts. This relationship stems from the standard units of volume used in the United States customary system. Knowing that a quart is a quarter of a gallon helps to establish this conversion: since four quarts make up one whole gallon, the correct answer is that there are four quarts in a gallon. This understanding is essential for various practical applications, such as cooking and measuring liquids.