Convert quarts to gallons
Convert quarts to gallons instantly. 1 qt = 0.25 gal. Formula, worked examples and a quick reference table.
Last updated
One us quart equals 0.25 us gallons. To convert any number of us quarts to us gallons, multiply by 0.25.
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.
quarts to gallons formula
To go the other way, use us quart = us gallon ÷ 0.25.
About these units
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".
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.
US Quart is also written quarts and qts. US Gallon is also written gallons, gals and us gal.
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.
quarts to gallons conversion table
| US Quart | US Gallon |
|---|---|
| 1 qt | 0.25 gal |
| 2 qt | 0.5 gal |
| 3 qt | 0.75 gal |
| 5 qt | 1.25 gal |
| 10 qt | 2.5 gal |
| 20 qt | 5 gal |
| 25 qt | 6.25 gal |
| 50 qt | 12.5 gal |
| 100 qt | 25 gal |
| 250 qt | 62.5 gal |
| 500 qt | 125 gal |
| 1,000 qt | 250 gal |
Frequently asked questions
How many us gallons are in a us quart? +
There are 0.25 us gallons in one us quart.
What is 10 qt in gal? +
10 qt equals 2.5 gal. Multiply 10 by 0.25.
How do I convert us gallon back to us quart? +
Use us quart = us gallon ÷ 0.25. The converter above handles both directions, or see our dedicated gallons to quarts page.
How accurate is this us quart to us gallon conversion? +
The factor used is 0.25, 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 qt to gal in my head? +
Divide by 4. That matches the true factor of 0.25 exactly, so no adjustment is needed for a mental estimate.