Quarts to Gallons Converter

How to use the quarts to gallons converter

1. Enter a number in the Quarts field or the Gallons field.
2. The other field updates automatically as you type.
3. Read the converted value below the fields along with equivalent pints and cups.
4. Clear either field to start a new conversion.

How the conversion works

The relationship between US liquid quarts and US liquid gallons is fixed by definition: one gallon contains exactly four quarts. To convert quarts to gallons, divide the number of quarts by four. To convert gallons to quarts, multiply by four.

For example, if you have 18 quarts of paint, the calculation is 18 / 4 = 4.5 gallons. If you need 3.25 gallons of water for a recipe, that is 3.25 * 4 = 13 quarts. Because the factor is an exact integer, there is no floating-point drift when converting whole numbers.

Common conversions reference

This table lists frequently used values for quick reference when converting quarts to gallons.

Where this conversion is used

Quarts and gallons are standard US customary units for measuring liquid volume. You will encounter them in several everyday situations:

• Cooking and recipes: Large-batch recipes for soups, stocks, or beverages often list ingredients in quarts or gallons.
• Automotive fluids: Motor oil, coolant, and transmission fluid are commonly sold by the quart in the United States.
• Paint and coatings: Paint is typically sold in quarts, gallons, and five-gallon buckets.
• Agriculture and gardening: Liquid fertilizers and pesticides are measured in gallons per acre or mixed in quart-sized sprayers.

If you need to convert larger volumes such as those used in pools or tanks, you might also use a cubic feet to gallons converter alongside this tool.

US liquid vs US dry vs UK imperial

The word "quart" can refer to three different volumes depending on the system. This converter uses only the US liquid quart, which is exactly 0.946352946 liters. The US liquid gallon is exactly 3.785411784 liters.

The US dry quart is about 1.101221 liters and is used for agricultural commodities like grain. The UK imperial quart is about 1.136523 liters, and the imperial gallon is about 4.54609 liters. Mixing these systems is a common source of error. Always confirm whether your source material refers to US liquid, US dry, or imperial units before converting.

Relationship to smaller units

Understanding how quarts and gallons fit into the broader US customary system helps avoid mistakes. One quart equals two pints, and one pint equals two cups. Therefore, one gallon equals eight pints or sixteen cups.

When scaling a recipe up or down, it is often easier to convert everything to the smallest unit first (such as cups), do the arithmetic, and then convert back to quarts or gallons. For instance, 2.5 gallons is 40 cups. If you halve the recipe, you need 20 cups, which is 5 quarts or 1.25 gallons.

Worked examples

Each result below was produced by the same code the tool runs, so you can check your own numbers against them.