Gallons to quarts
One gal equals 4 qt. Type any number and the answer appears as you type — the maths happens in your browser.
Result
The same value in every unit
| Unit | Value |
|---|
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Common values
| gallons | quarts |
|---|---|
| 1 gal | 4 qt |
| 2 gal | 8 qt |
| 3 gal | 12 qt |
| 5 gal | 20 qt |
| 10 gal | 40 qt |
| 15 gal | 60 qt |
| 20 gal | 80 qt |
| 25 gal | 100 qt |
| 50 gal | 200 qt |
| 100 gal | 400 qt |
| 500 gal | 2000 qt |
| 1000 gal | 4000 qt |
How to use
- Enter the number of gallons in the field.
- The result in quarts updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: qt = gal × 4. Going back the other way, one qt is 0.25 gal.
Where the odd number comes from
The factor is not a round number because the imperial units are defined through the metric ones by international agreement: an inch is exactly 25.4 mm and a pound is exactly 0.45359237 kg. Everything else follows from those definitions.
qt = gal × 4
Frequently asked questions
How many quarts are in one gallons?
One gal is 4 qt.
How do I convert gallons to quarts?
Multiply by the factor: qt = gal × 4.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert quarts back to gallons?
One qt is 0.25 gal — or open the reverse page linked below.