Qt to gallons (qt to gal)

One US liquid quart is exactly a quarter of a US gallon. The name is the definition: quart is from quarter.

Worked through: 5 qt x 0.25 = 1.25 gal.

Going the other way, one US gallon is 4 US quarts.

For mental arithmetic: Divide by 4.

The US has two quarts, which is the thing worth knowing here. The liquid quart is 0.946 liters, a quarter of the 231-cubic-inch gallon. The dry quart, used for berries, tomatoes and produce sold by the box, is 1.101 liters, a quarter of a different, larger dry gallon. So a 'quart of strawberries' is about 16% more volume than a quart of milk. This converter uses the liquid quart throughout; the dry units are almost never converted and are disappearing from shop shelves in favor of weight.

Precision is worth matching to the input. A measurement given as 1 qt carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.