Converting cups to litres takes one multiplication: 1 cup = 0.2366 litre. Multiply the number of cups by 0.2366 and the answer comes out in litres. It sounds too simple to need a whole page, but in practice people look this up while cooking, with wet hands and a recipe written in the other system — and a wrong guess at this point puts the wrong amount of liquid in the pan. This page gives you the number, the table, and the worked examples so you can convert once and cook with confidence.
The reason this conversion is worth a page of its own is that it sits at the junction of two measuring traditions. The US customary system grew out of old English measures, while the metric system was designed to be decimal — and recipes cross between them constantly now that cooks follow recipes from every country on the internet. Knowing that 1 cup is a fixed number of litres means you can follow any recipe, whatever system it was written in, with the tools you already own.
Conversion table
| Cups | Litres |
|---|---|
| ¼ cup | 0.0591 litre |
| ⅓ cup | 0.0789 litre |
| ½ cup | 0.1183 litre |
| ⅔ cup | 0.1577 litre |
| ¾ cup | 0.1774 litre |
| 1 cup | 0.2366 litre |
| 1.5 cups | 0.3549 litre |
| 2 cups | 0.4732 litre |
| 3 cups | 0.7098 litre |
| 4 cups | 0.9464 litre |
Read the table in either direction. Going from cups to litres, multiply by 0.2366; going back, divide by 0.2366 or multiply by 4.2268. The middle rows are the ones recipes use most — ⅔ cup is 0.1577 litre, and 1 cup is 0.2366 litre. If your amount is not in the table, multiply it by 0.2366 and you have the answer. For a quick check: 1 cup is 0.2366 litre, 2 cups are 0.4732 litre, and 10 cups are 2.3659 litres.
Worked examples
A drink or a syrup. A jug of herb marinade needs 1.5 cups of liquid, which is 0.3549 litre. Drinks and syrups are the most forgiving place to practise conversions, because you can taste and adjust at the end. Use them to build confidence: convert, pour, taste, and next time the numbers will feel familiar instead of foreign.
Scaling a recipe up. Suppose a sauce recipe serves four and uses ¾ cup of stock, and you need to serve twelve. Triple it: 2.25 litres is 0.5323 litre. Work in the unit the recipe already uses, then convert once at the end — converting every ingredient separately invites rounding errors that add up. Remember that leavening, salt and cooking time do not scale in a straight line with volume, so scale the liquid exactly and season to taste at the end.
Doubling for the freezer. You make a double batch of chicken stock to freeze one for later. The recipe needs 1.5 cups; doubled, that is 3 litres, or 0.7098 litre. A large jug marked in litres is easier to read at this scale than counting cups one by one, and one reading means one chance to misread instead of eight. Label the frozen tub with the date and the recipe name, and the second dinner is already half cooked.
How the conversion works
The US cup is defined as 236.5882 ml, and the litre is defined as 1000 ml. Divide the first by the second and you get 0.2366 — that is the whole derivation, and it is why the conversion is exact rather than approximate. No kitchen experiment was needed to establish it; the units were defined this way, so the ratio follows from the definitions. That is also why the same factor appears in every reliable conversion chart: there is only one right answer, and every source that uses US customary units agrees on it.
The one thing to check is which cup your recipe means. This page uses the US customary cup throughout. A metric cup is 250 ml, an imperial cup is 284 ml, and older recipes sometimes use a 'cup' that means whatever cup the writer had in the cupboard. If a recipe from outside the US gives an amount that looks wrong after converting — a cake with far too much liquid, a soup that is far too thin — the cup is the first suspect. Convert the recipe to grams once, write the grams on the recipe card, and the question never comes up again.
Rounding deserves a note too. The exact factor is 0.2366 to four decimal places, and the full value runs further (236.59 ml divided by 1000.00 ml). For everyday cooking, rounding to two or three significant figures is fine: a 1% rounding error is invisible in a soup and barely noticeable in a cake. But round only at the end. If you round the factor and then multiply by a large amount, the rounding error grows with the amount — so keep the full factor through the calculation and round the answer, not the factor.
Volume is not weight
A conversion between two volume units is the same for every ingredient, but a conversion between volume and weight is not — and confusing the two is the most common conversion mistake in cooking. A cup of all-purpose flour weighs about 120 g spooned and levelled (King Arthur Baking), a cup of granulated sugar about 198 g, a cup of butter about 227 g, a cup of milk about 244 g (USDA), and a cup of honey about 336 g. All of those weights are approximate, because they depend on how the ingredient is measured: flour is spooned and levelled, brown sugar is packed at about 213 g a cup, and honey is poured.
Flour weight is the most disputed conversion in baking. King Arthur Baking lists 120 g per cup spooned and levelled, while other sources quote 125 g, 130 g and up to 142 g for a scooped cup. We use the King Arthur spooned-and-levelled value as primary, and the gap is a warning: if you scoop flour instead of spooning and levelling it, you can add 20 g or more per cup, which is enough to make a cake dry. Granulated sugar carries a smaller dispute — King Arthur lists 198 g per cup and the USDA rounds it to 200 g, a difference of rounding rather than a real disagreement. When a recipe matters, verify with a kitchen scale: weigh the ingredient instead of measuring it by volume, and every dispute on this page disappears.
Cooking with metric recipes
Most of the world cooks in millilitres and litres, and most American recipes cook in cups and spoons, so sooner or later every cook has to cross between the two systems. The way to do it is to convert the whole recipe to one system before you start, not ingredient by ingredient as you go. Pick the system your tools match — if your jug is marked in millilitres, convert everything to millilitres; if your cups are marked in cups, convert everything to cups — and write the converted amounts on the recipe. Round sensibly: 236.59 ml becomes 240 ml in practice, and 14.79 ml becomes 15 ml, because a 1% rounding is invisible in a soup and barely visible in a cake. But do not round the small things: a teaspoon of baking powder rounded up by 20% is a real error. If a recipe gives grams as well as millilitres, use the grams — weight is the same in every country, and a scale ends the whole argument about cups. After a few converted recipes, the common equivalents become familiar, and the crossing gets faster.
Frequently asked questions
How many cups are in 1 litre?
4.2268 cups — the reverse of the main conversion. Divide the number of litres by 0.2366, or multiply by 4.2268. For example, 16.907 cups is 4 litres. Use the reverse direction when a metric recipe gives you litres and your cups are in cups.
How do I convert cups to litres without a calculator?
Multiply by 0.2366; for a quick mental estimate, round the factor to a friendly number and accept a small error. If the factor is larger than 1, break the amount into whole units and fractions — for example, convert 2 cups and a half cup separately and add them. If the factor is smaller than 1, remember that one litre is 4.2268 cups, which is often easier to picture. For anything that matters, a phone calculator or the table on this page is faster and more accurate than mental maths mid-recipe.
How many cups are in 0.4732 litres?
Two cups — because 0.4732 litre divided by 0.2366 is 2. Doubling is the easiest check on any conversion: if doubling the input doubles the output, the factor is being applied correctly. Use it to sanity-check your maths whenever a converted amount looks surprising.
How many litres are in 1.5 cups?
0.3549 litre. Multiply 1.5 by 0.2366. Larger amounts like this are where a jug marked in litres earns its keep — counting them out in cups means many pourings and many chances to lose count.
What measuring tools do I need for cups and litres?
A set of dry measuring cups, a set of measuring spoons, and a liquid jug marked in both cups and millilitres will cover almost every recipe. A kitchen scale is the best single addition: it measures weight directly, which is more accurate than any volume measure, and it ends arguments about how a cup was filled. Check that your jug's markings are accurate by pouring a known amount — one cup of water should read 0.2366 litre on the litres scale.