Gallon, Quart, Pint, US Volume Conversions Explained
An American gallon is 3.785 liters. A quart, a quarter of that amount, is 946 ml. A pint, half a quart, is 473 ml. These three units nest inside one another according to a strictly defined system, inherited from British imperial measures adapted for the United States.
How these units fit together
The system is based on the fluid ounce (fl oz), the smallest unit in the series:
- 1 gallon = 128 fl oz ≈ 3.785 L
- 1 half-gallon = 64 fl oz ≈ 1.89 L
- 1 quart = 32 fl oz ≈ 946 ml
- 1 pint = 16 fl oz ≈ 473 ml
- 1 cup (official US) = 8 fl oz ≈ 237 ml
Each unit doubles the one before it: 2 cups make 1 pint, 2 pints make 1 quart, 4 quarts make 1 gallon. It's a coherent system, just built on a different base than the metric one.
A detail worth noting about the cup
Our converter uses 250 ml for a cup, the common usage in Québécois cooking. The official US cup, meanwhile, is 236.6 ml (8 fl oz) — a slight gap that explains why the liter and gallon figures don't land on perfectly round numbers if you start from the site's cup rather than the American fluid ounce. For these larger volume units, it's better to convert starting from fluid ounces or milliliters directly, rather than multiplying a rounded cup.
Where you run into these units in cooking
Gallons and quarts show up mostly for large quantities: a gallon of milk, a quart of ice cream, a big batch of sauce or marinade for a group meal. Pints are more common for smaller liquid quantities — a pint of whipping cream, for example, or a pint of blueberries in a summer dessert recipe (note: a "pint" of fruit often refers to a sales container, not exactly 473 ml).
Quick reference for fast conversions
- ¼ gallon = 1 quart ≈ 946 ml
- ½ gallon ≈ 1.89 L
- 1 gallon ≈ 3.79 L
- 1 pint ≈ 2 cups (based on the official US cup)
If an American recipe gives you a quantity in gallons or quarts for canning or a marinade, convert to liters first using these reference points, then use our converter for the more precise quantities in cups, milliliters, or spoons once the large quantity has been brought down to a more workable scale.
Where these units really matter: canning, brines, drinks
You rarely meet a gallon in a cake. The recipes where these units genuinely count are large-batch preparations: canning and pickles ("1 gallon of cucumbers"), the brine for a Thanksgiving turkey ("2 gallons of water, 2 cups of salt"), lemonade or iced tea for a party, homemade stock. In these recipes, the gallon's precision hardly matters — 3.8 L or 4 L of brine changes nothing — but the proportion of salt or sugar per volume does. So convert the total volume to liters, then apply the recipe's ratio: for the brine above, 2 cups of salt (about 600 g of fine salt) for 7.6 L of water.
One special case: the "pint" of fruit (strawberries, blueberries, cherry tomatoes) sold at the market refers to a container, not exactly 473 ml. A pie recipe calling for "1 pint of blueberries" expects roughly 2 cups of fruit — measure by volume, without chasing precision to the milliliter.
The American pint and the British pint aren't the same
If you come across a British recipe, watch out: the UK imperial pint is about 20% larger than the American pint, because the imperial and US systems, though cousins, diverged in the 19th century. The same goes for the gallon and the imperial fluid ounce, slightly different from the American one. An English recipe asking for "half a pint of milk" therefore expects more milk than an American recipe with the same wording. The units in this article, and in the converter, are the American ones — by far the most common in online recipes.
Why this system persists in the US
Unlike Canada and France, which adopted the metric system for retail sales, the US continues to use gallons, quarts, and pints for most liquid products sold at the grocery store — milk, juice, oil. It's a matter of commercial and regulatory habit more than logic: the American imperial system remains perfectly consistent internally, it just doesn't line up with the units used elsewhere in the world.
For an occasional recipe that mentions a gallon or a quart, you rarely need a container graduated in those exact units: convert to liters first using the reference points above, then use whatever container graduated in milliliters or liters you already have at home.
To understand why the British pint differs from the American one, and what that changes for cups, read US cup vs imperial cup vs metric cup. The volume equivalents are also in the complete conversion chart.