how much is 4 quarts of water

February 15, 2026

4 quarts of water is the same as 1 gallon of water in US measurements.

Basic conversions

4 quarts = 1 gallon.

1 gallon ≈ 3.8 liters (about 3.79 L).

So 4 quarts ≈ 3.8 liters of water.

If you’re following recipes or hydration advice online in early 2026, “drink a gallon of water a day” is effectively telling you to drink 4 quarts (about 3.8 liters).