The answer depends on which cup you mean
A liter is always 1,000 ml. The confusion comes entirely from the cup, which is three different sizes depending on where the recipe was written. Divide 1,000 by the cup size and you get a different answer every time — which is why a quick web search returns 4, 4.23 and 3.52 for the same question.
| Cup | Size | Cups in 1 liter |
|---|---|---|
| US customary cup | 236.588 ml | 4.23 cups |
| US legal cup (nutrition labels) | 240 ml | 4.17 cups |
| Metric cup (Australia, NZ, Canada) | 250 ml | 4 cups |
| Imperial cup (UK) | 284.131 ml | 3.52 cups |
How to tell which cup your recipe uses
American recipes use the US customary cup (236.588 ml), so 4.23 cups per liter is the right figure for them. Recipes from Australia, New Zealand or Canada usually mean the metric cup, so a liter is a neat 4 cups. Older British recipes that still talk in cups generally mean the imperial cup, and a liter is only 3.52 of those. If the recipe also lists grams or milliliters anywhere, trust those instead — they do not change across borders.
A practical conversion table
| Liters | US cups | Metric cups | Imperial cups |
|---|---|---|---|
| 0.5 L | 2.11 | 2 | 1.76 |
| 1 L | 4.23 | 4 | 3.52 |
| 1.5 L | 6.34 | 6 | 5.28 |
| 2 L | 8.45 | 8 | 7.04 |
Worked example: scaling a soup
A stock recipe calls for 2 liters of water and you are measuring with US cups. That is 2 × 4.22675 = 8.45 cups — call it 8½ cups. If you instead used metric cups, 2 liters would be exactly 8 cups, and the ½-cup difference is enough to thin a soup noticeably. The liters to cups converter does any figure instantly, and the cup sizes guide explains why the three cups differ in the first place.
When cups are the wrong tool
For anything over about 2 liters — stock pots, brines, big-batch baking — stop converting to cups and measure in liters or milliliters directly. A measuring jug with ml markings removes the cup-size question entirely, and for baking, weighing liquids in grams is more accurate still: 1 liter of water weighs exactly 1,000 g.
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