Gallons to Quarts
Type US gallons (gal), see US quarts (qt).
By Akash Yadav Updated 19 October 2026
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The formula
How to convert gallons to quarts
To change gallons into quarts, multiply by 4.
quarts = gallons × 4
Going the other way: gallons = quarts ÷ 4
1 US liquid gallon = 4 quarts. This factor is the exact definition of the unit, not a rounded estimate.
Worked example
You have 2.5 gallons. Multiply by 4. 2.5 × 4 = 10 qt.
Common values
Gallons to quarts conversion table
| Gallons (gal) | Quarts (qt) |
|---|---|
| 0.25 gal | 1 qt |
| 0.5 gal | 2 qt |
| 0.75 gal | 3 qt |
| 1 gal | 4 qt |
| 1.25 gal | 5 qt |
| 1.5 gal | 6 qt |
| 2 gal | 8 qt |
| 2.5 gal | 10 qt |
| 3 gal | 12 qt |
| 4 gal | 16 qt |
| 5 gal | 20 qt |
| 6 gal | 24 qt |
| 10 gal | 40 qt |
| 20 gal | 80 qt |
Before you rely on it
US liquid gallons and quarts
This page uses US liquid units, the ones on milk jugs, paint cans and motor oil. Exactly 4 US quarts make 1 US gallon, so nothing on this page is rounded.
The UK Imperial gallon also holds 4 Imperial quarts, but both are bigger: the Imperial gallon is exactly 4.54609 liters against the US gallon’s 3.785411784.
The US dry gallon and dry quart, used for produce, are separate units. Nothing on this site converts them.
The family divides neatly: 1 gallon is 4 quarts, 8 pints or 16 cups.
Common questions
Frequently asked questions
How many quarts are in a gallon?
1 US gallon is exactly 4 quarts.
How many quarts are in half a gallon?
Half a gallon is exactly 2 quarts.
How many quarts are in 1.5 gallons?
1.5 gallons is exactly 6 quarts.
How many quarts are in 2 gallons?
2 gallons is exactly 8 quarts.
How many quarts are in 5 gallons?
5 gallons is exactly 20 quarts — a standard bucket.
How many cups are in a gallon?
1 US gallon is exactly 16 cups.
Keep going
Related converters
- Quarts to Gallons qt → gal
- Gallons to Liters gal → L
- Pints to Cups pt → cup
- Cups to Pints cup → pt
- All volume converters
Read next
Guides that cover this conversion
Every factor on this page is listed in our conversion methodology.