Gallons to Quarts
Type a value in either box to convert between gallons and quarts. The factor is 4.
| Gallons | Quarts |
|---|---|
| 1 gal | 4 qt |
| 2 gal | 8 qt |
| 3 gal | 12 qt |
| 5 gal | 20 qt |
| 10 gal | 40 qt |
| 25 gal | 100 qt |
| 50 gal | 200 qt |
| 100 gal | 400 qt |
How to use
- Enter a value in the Gallons field.
- The Quarts figure appears immediately — no button to press.
- Typing in the Quarts field converts back to Gallons the same way.
- Use the reference table for the values that come up most often.
Gallons to Quarts formula
Converting gallons to quarts is a single multiplication by 4.
qt = gal × 4
Put another way, one gallon is exactly 4 quarts.
Why this factor: the gallon and the quart are both defined against the liter, so dividing one definition by the other gives 4 directly. Both definitions are set out in full below.
To go the other way, divide by 4 — or use the Quarts to Gallons converter, which is the same calculation reversed.
Worked example
Take 50 gal and multiply by the factor 4: the result is 200 qt.
50 gal × 4 = 200 qt
The converter above does this for any value you type, in either direction.
What is a gallon?
A US liquid gallon is the standard large-volume unit in the United States.
Definition: Defined as exactly 231 cubic inches, which works out to exactly 3.785411784 liters.
Where it is used: Fuel sales, milk and beverage containers, and paint in the US.
Worth knowing: The imperial gallon used in the UK and Canada is about 20% larger, at 4.54609 L — so 'miles per gallon' figures are not comparable between the two.
What is a quart?
A quart is a quarter of a US gallon — two pints.
Definition: Exactly one quarter of a US liquid gallon, so exactly 0.946352946 liter.
Where it is used: Milk, motor oil, stock and broth, and ice cream in the US.
Worth knowing: Close to a liter but about 5% smaller, which makes it an easy source of recipe error.
Gallons vs Quarts
The gallon and the quart belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many quarts are in a gallon?
One gallon equals 4 quarts.
What is the formula to convert gallons to quarts?
Multiply the number of gallons by 4. To reverse it, divide by 4 instead.
How do I convert quarts back to gallons?
Divide by 4, which is the same as multiplying by 0.25.
How many quarts are in 10 gallons?
10 gal works out to 40 qt.
Is there anything to watch out for with gallons?
The imperial gallon used in the UK and Canada is about 20% larger, at 4.54609 L — so 'miles per gallon' figures are not comparable between the two.
How is the gallon defined?
Defined as exactly 231 cubic inches, which works out to exactly 3.785411784 liters.