Convert gallons to quarts
Convert gallons to quarts instantly. 1 gal = 4 qt. Formula, worked examples and a quick reference table.
Last updated
One us gallon equals 4 us quarts. To convert any number of us gallons to us quarts, multiply by 4.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Volume is the category where the US and imperial systems diverge most damagingly. Gallons, quarts, pints and fluid ounces all exist in two sizes that differ by up to 20%, and nothing in the name warns you which one a figure uses. Recipes, fuel economy figures and container capacities all cross borders regularly, so it is worth checking which system a source is using before converting rather than after.
gallons to quarts formula
To go the other way, use us gallon = us quart ÷ 4.
About these units
A US gallon is 231 cubic inches, about 3.785 litres. It is noticeably smaller than the imperial gallon, which is a frequent source of fuel-economy confusion.
A quart is a quarter of a gallon, so it inherits the US and imperial split: 946 millilitres against 1,137. The name is simply a contraction of "quarter".
US Gallon is also written gallons, gals and us gal. US Quart is also written quarts and qts.
Sources
- National Bureau of Standards, "Refinement of Values for the Yard and the Pound", Federal Register, 1 July 1959 — the international yard as exactly 0.9144 m and the avoirdupois pound as exactly 0.45359237 kg.
- NIST Special Publication 811, Guide for the Use of the International System of Units (SI), 2008 edition — conversion factors for units outside the SI.
gallons to quarts conversion table
| US Gallon | US Quart |
|---|---|
| 1 gal | 4 qt |
| 2 gal | 8 qt |
| 3 gal | 12 qt |
| 5 gal | 20 qt |
| 10 gal | 40 qt |
| 20 gal | 80 qt |
| 25 gal | 100 qt |
| 50 gal | 200 qt |
| 100 gal | 400 qt |
| 250 gal | 1,000 qt |
| 500 gal | 2,000 qt |
| 1,000 gal | 4,000 qt |
Frequently asked questions
How many us quarts are in a us gallon? +
There are 4 us quarts in one us gallon.
What is 10 gal in qt? +
10 gal equals 40 qt. Multiply 10 by 4.
How do I convert us quart back to us gallon? +
Use us gallon = us quart ÷ 4. The converter above handles both directions, or see our dedicated quarts to gallons page.
How accurate is this us gallon to us quart conversion? +
The factor used is 4, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate gal to qt in my head? +
Multiply by 4. That matches the true factor of 4 exactly, so no adjustment is needed for a mental estimate.