The short answer: 1 litre = 4.2268 cups. That single number is the whole conversion — multiply any amount in litres by 4.2268 and you have the amount in cups. It is an exact conversion between two units of volume in the US customary system, so there is no estimating, no density to look up and no ingredient that changes it. A litre of water, a litre of milk and a litre of stock are all 4.2268 cups.
Most people meet this conversion when a recipe is written in one system and their tools are marked in the other. American recipes use litres; metric recipes use cups; and a cook who follows recipes from both ends up converting constantly. The good news is that volume-to-volume conversions are the simplest kind: the factor is exact, it never depends on the ingredient, and it works the same way for water, milk, oil, stock and every other liquid you cook with.
Conversion table
| Litres | Cups |
|---|---|
| ¼ litre | 1.0567 cups |
| ½ litre | 2.1134 cups |
| ¾ litre | 3.1701 cups |
| 1 litre | 4.2268 cups |
| 1.5 litres | 6.3401 cups |
| 2 litres | 8.4535 cups |
| 3 litres | 12.6803 cups |
| 4 litres | 16.907 cups |
Read the table in either direction. Going from litres to cups, multiply by 4.2268; going back, divide by 4.2268 or multiply by 0.2366. The middle rows are the ones recipes use most — 1 litre is 4.2268 cups, and 2 litres is 8.4535 cups. If your amount is not in the table, multiply it by 4.2268 and you have the answer. For a quick check: 1 litre is 4.2268 cups, 2 litres are 8.4535 cups, and 10 litres are 42.2675 cups.
Worked examples
A curry sauce that needs ¾ litre. The recipe calls for ¾ litre and your jug is marked in cups. That is 3.1701 cups — pour to that line and you have the right amount. If you double the recipe for a crowd, you need 1.5 cups, which is 6.3401 cups. The conversion itself never changes with the ingredient: whether the curry sauce uses milk, water or melted butter, ¾ litre is always 3.1701 cups. What changes is only the weight, never the volume.
A small batch, halved. A strawberry jam recipe makes too much, so you halve it. The original uses 1.5 litres; halved, that is 0.75 litre, which is 3.1701 cups. Small amounts are where conversion errors hurt most, because a 10% error in a small amount of liquid is a bigger share of the recipe. When the halved amount is awkward, measure it in cups — the finer unit gives you a cleaner number.
Baking, where precision matters. A cake batter that needs 1.5 litres of milk has no room for guessing: that is 6.3401 cups. In baking, liquid is a structural ingredient, and a 10% error changes the crumb. If your recipe gives the liquid in cups and your cups are in litres, convert before you start, not while the oven is heating. And if the recipe also gives a weight in grams, use the weight — it is the most accurate measure of all.
How the conversion works
The US litre is defined as 1000 ml, and the cup is defined as 236.5882 ml. Divide the first by the second and you get 4.2268 — 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 litre your recipe means. This page uses the US customary litre 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 4.2268 to four decimal places, and the full value runs further (1000.00 ml divided by 236.59 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.
Common mistakes
The most common mistake is mixing up volume and weight: a fluid ounce is a volume, an ounce is a weight, and they are only the same number for water. A cup of flour and a cup of honey are the same volume and very different weights. The second mistake is the cup itself: a US cup is 236.59 ml, a metric cup is 250 ml, and an imperial cup is 284 ml, so a recipe that just says 'cup' without saying which cup can be off by a fifth before you start. The third mistake is the pint: a US pint is 473 ml and 16 fluid ounces, while an imperial pint is 568 ml and 20 fluid ounces — a big difference in a beer batter or a stock pot. The fourth is the tablespoon: a US tablespoon is 14.79 ml, but an Australian tablespoon is 20 ml, so an Australian recipe measured with US spoons is short by a quarter. The fifth mistake is rounding too early: converting each ingredient separately and rounding each one lets small errors add up, so convert once, at the end, and keep the full number until the final step. Check which system your recipe uses before you measure anything, and the rest is simple arithmetic.
Frequently asked questions
Is a US litre the same as a metric or imperial litre?
Not always, and this is the biggest trap in unit conversion. This page uses the US litre (1000 ml). A metric cup is 250 ml, an imperial cup is 284 ml, a US pint is 473 ml while an imperial pint is 568 ml, and an Australian tablespoon is 20 ml against the US 14.79 ml. If your recipe comes from outside the US, check which system it uses before converting — the factor on this page is correct for US measures only.
Can I use a kitchen scale instead of converting?
For liquids, often yes. A kitchen scale removes volume conversion entirely if the recipe gives grams, and for water-based liquids 1 ml weighs about 1 g, so millilitres and grams are nearly interchangeable. But the shortcut fails for fats and syrups: a cup of olive oil weighs about 216 g, not 237 g, and a cup of honey about 336 g. Use the scale when the recipe gives weights, and use this conversion when the recipe gives volumes.
Does temperature change the conversion?
No, not in any way that matters in a kitchen. Liquids expand slightly when heated, so a cup of boiling stock is a fraction of a percent larger in volume than a cup of cold stock, but the difference is far smaller than ordinary measuring error. Measure liquids at room temperature where you can, and never worry about temperature when converting between volume units.
How many litres are in 1 cup?
0.2366 litre — the reverse of the main conversion. Divide the number of cups by 4.2268, or multiply by 0.2366. For example, 0.9464 litre is 4 cups. Use the reverse direction when a metric recipe gives you cups and your cups are in litres.
How do I convert litres to cups without a calculator?
Multiply by 4.2268; 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 litres and a half litre separately and add them. If the factor is smaller than 1, remember that one cup is 0.2366 litre, 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.