mL to cups: US, metric and Imperial cups
To convert mL to cups, divide by 236.588, the US cup. 500 mL is 2.11 US cups.
Cups in 500 mL
500 mL / 236.588 mL per cup = 2.11 cups
US customary cup 236.588 mL, NIST SP 811. How we calculate this
Milliliters: 500. Cup: US customary, 236.6 mL.
To convert mL to cups, divide the milliliters by 236.588, the US customary cup listed in NIST SP 811. So 250 mL is 1.06 US cups and 500 mL is 2.11 US cups. For a metric cup, divide by 250 instead, which makes 250 mL exactly 1 cup. The converter above shows both, plus the 240 mL labeling cup and the 284 mL Imperial cup.
Enter the milliliters and pick the cup your recipe uses. US customary is the default. The big figure is the nearest kitchen fraction when one is within 3 percent, and two decimals when none is; the line under it always shows the division to two decimals.
Quick answer: how do you convert mL to cups?
Divide the milliliters by 236.588, the US customary cup in NIST SP 811. So 250 mL is 1.06 US cups and 500 mL is 2.11 US cups. For a metric cup, divide by 250 instead, which makes 250 mL exactly 1 cup. The converter also covers the 240 mL labeling cup and the 284 mL Imperial cup.
Key takeaways
- 1 US cup is 236.588 mL, a metric cup is 250 mL and the nutrition label cup is 240 mL.
- mL to cups does not change for flour or sugar, because both units measure volume.
- 1 liter is about 4.23 US cups (1,000 / 236.588).
- Small amounts read better in spoons: 100 mL is 0.42 US cups, or 6 tablespoons plus 2 teaspoons.
Worked example: 500 mL to cups
Take 500 mL. Divide by the US customary cup: 500 / 236.588 = 2.1134, so 500 mL is 2.11 US cups, or 2 1/8 cups in kitchen fractions. With the 240 mL labeling cup the same 500 mL is 500 / 240 = 2.0833 cups. With the 250 mL metric cup it is exactly 2.00 cups. With the Imperial cup it is 500 / 284.131 = 1.76 cups.
The math reverses. Two US cups are 2 x 236.588 = 473.176 mL, and 473.176 / 236.588 brings you back to 2.000 cups. A full liter is 1,000 / 236.588 = 4.2268 US cups.
| Cup | Milliliters | Source | Where you meet it |
|---|---|---|---|
| US customary cup | 236.588 | NIST SP 811, Appendix B.8 (0.236 588 2 L) | US recipes and US measuring cups |
| US labeling cup | 240 | 21 CFR 101.9(b)(5)(viii) | Nutrition Facts labels on US packaged food |
| Metric cup | 250 | Defined as 250 mL | Australia, Canadian recipes, UK metric recipes |
| Imperial cup | 284.131 | 2 Imperial gills, NIST SP 811 (gill 0.142 065 3 L) | UK recipes in Imperial units, 10 Imperial fluid ounces |
| mL | US cups | Kitchen measure | Metric cups |
|---|---|---|---|
| 5 | 0.02 | 1 teaspoon (labeling) | 0.02 |
| 15 | 0.06 | 1 tablespoon (labeling) | 0.06 |
| 30 | 0.13 | 1/8 cup | 0.12 |
| 50 | 0.21 | none within 3 percent | 0.20 |
| 60 | 0.25 | 1/4 cup | 0.24 |
| 75 | 0.32 | none within 3 percent | 0.30 |
| 80 | 0.34 | 1/3 cup | 0.32 |
| 100 | 0.42 | none within 3 percent | 0.40 |
| 120 | 0.51 | 1/2 cup | 0.48 |
| 125 | 0.53 | none within 3 percent | 0.50 |
| 150 | 0.63 | 5/8 cup | 0.60 |
| 180 | 0.76 | 3/4 cup | 0.72 |
| 200 | 0.85 | none within 3 percent | 0.80 |
| 240 | 1.01 | 1 cup | 0.96 |
| 250 | 1.06 | none within 3 percent | 1.00 |
| 300 | 1.27 | 1 1/4 cups | 1.20 |
| 350 | 1.48 | 1 1/2 cups | 1.40 |
| 400 | 1.69 | 1 2/3 cups | 1.60 |
| 450 | 1.90 | 1 7/8 cups | 1.80 |
| 500 | 2.11 | 2 1/8 cups | 2.00 |
| 600 | 2.54 | 2 1/2 cups | 2.40 |
| 750 | 3.17 | 3 1/8 cups | 3.00 |
| 1,000 | 4.23 | 4 1/4 cups | 4.00 |
| mL | US customary (236.588) | Labeling (240) | Metric (250) | Imperial (284.131) |
|---|---|---|---|---|
| 100 | 0.42 | 0.42 | 0.40 | 0.35 |
| 250 | 1.06 | 1.04 | 1.00 | 0.88 |
| 500 | 2.11 | 2.08 | 2.00 | 1.76 |
| 1,000 | 4.23 | 4.17 | 4.00 | 3.52 |
How we calculate this
Formula
Cups = milliliters / milliliters per cup.
500 / 236.5882365 = 2.1134 cups.
Shown to two decimals as 2.11 cups, and as 2 1/8 cups because that kitchen fraction is within 3 percent.
Your inputs
Milliliters: 500. Cup: US customary, 236.5882365 mL (1/16 of the 231 cubic inch gallon, NIST Handbook 44).
Sources
- NIST Special Publication 811, Appendix B.8 (read 8 October 2026). The US customary cup is 0.236 588 2 L, which is 236.5882 mL. The same table lists the tablespoon at 14.786 76 mL, the teaspoon at 4.928 922 mL and the Imperial gill at 0.142 065 3 L. The Imperial cup is two Imperial gills, 284.1306 mL, shown as 284.131.
- 21 CFR 101.9(b)(5)(viii) (read 8 October 2026), the FDA nutrition labeling rule on the eCFR. It sets the labeling cup at 240 mL, the labeling tablespoon at 15 mL and the labeling teaspoon at 5 mL. The metric cup is 250 mL by definition.
- NIST Handbook 44, Appendix C, General Tables of Units of Measurement (read 9 October 2026), 2026 edition. It defines the US gallon as 231 cubic inches exactly, which is 3,785.411784 mL, and 128 US fluid ounces exactly, with the measuring cup at 8 fluid ounces. So the converter divides by the exact cup, 3,785.411784 / 16 = 236.5882365 mL. NIST SP 811 rounds the same cup to 236.5882 mL.
Limits
Results show two decimals, and a kitchen fraction in eighths or thirds appears only when it is within 3 percent of the decimal: 500 mL shows 2 1/8 cups, while 200 mL shows no fraction because 7/8 cup is 3.5 percent off. This is a volume conversion, so the ingredient does not change the answer. It cannot account for how level or how full your measuring cup is, and a drinking cup is not a measuring cup.
Video: Convert cups to fluid ounces to milliliters and back
How many mL in a cup
One US customary cup is 236.588 mL, or 8 US fluid ounces. The number comes from the US gallon, which is 231 cubic inches, split into 16 cups. A labeling cup on a US Nutrition Facts panel is 240 mL. A metric cup is 250 mL. An Imperial cup, the UK cup of 10 Imperial fluid ounces, is 284.131 mL. Going the other way, 1 mL is 0.0042 US cups, 0.0040 metric cups or 0.0035 Imperial cups. A cup is far bigger than a milliliter, so cup values for small amounts are tiny decimals, and teaspoons and tablespoons serve you better below about 30 mL.
Is a cup 240 mL or 250 mL
Both numbers are real, and they belong to different rules. The US customary cup is 236.588 mL, which rounds to 237 mL. The 240 mL cup is the figure the FDA fixes for serving sizes on US food labels in 21 CFR 101.9. So a recipe that lists 1 cup as 240 mL matches the labeling rule, and one that lists 237 mL matches the rounded customary cup. The 250 mL cup is the metric cup, used in Australia, in Canadian recipes and in UK recipes written in metric. The difference between 236.588 and 250 is 5.7 percent. When a recipe gives no country, the spelling and the oven temperature unit can tell you where it comes from.
The difference between US and metric cups
A US cup holds 236.588 mL and a metric cup holds 250 mL, so the metric cup is 13.4 mL larger. For 1 cup of milk that gap is under a tablespoon. For 4 cups it grows to 53.6 mL, a little under a quarter US cup (59.1 mL). The spread table above shows the effect at 100, 250, 500 and 1,000 mL across all four cups. The Imperial cup is the outlier. At 284.131 mL it is 20 percent bigger than the US cup, so a recipe written in Imperial cups and measured with US cups comes out short. If you own metric measuring cups and cook from US recipes, divide by 236.588 and measure the milliliters, or use the converter with the US cup selected.
Is 200 mL one cup
No. In US customary cups, 200 mL is 0.85 cups. In labeling cups it is 0.83 cups, and in metric cups it is 0.80 cups. None of those round to 1 within the 3 percent rule, which is why the chart shows no fraction for 200 mL. The closest kitchen measure in US cups is 3/4 cup plus 1 tablespoon plus 1 teaspoon, which under the NIST spoon sizes adds up to 197.2 mL. If a recipe lists 200 mL as 1 cup, it is using a cup the converter does not offer, and you should treat the milliliters as the real figure.
How to measure mL without a measuring cup
Measuring spoons will do it. Under the FDA labeling rule a teaspoon is 5 mL and a tablespoon is 15 mL, so 100 mL is 6 tablespoons plus 2 teaspoons. The NIST customary spoons are a little smaller, 4.929 mL and 14.787 mL, so the same spoons give 98.6 mL. Either way you are within 2 percent. A US cup is 16 tablespoons or 48 teaspoons, so 3 tablespoons is 0.1875 cups, or 44.36 mL. For the full tablespoon and teaspoon tables, see the tablespoons in a cup page. A kitchen scale also works for water, where 1 mL weighs 1 g.
Does mL to cups change for flour or sugar
No. Milliliters and cups both measure volume, so 236.588 mL of flour is 1 US cup of flour, the same as it is for water. What changes is the weight. USDA FoodData Central lists 1 cup of all-purpose flour at 125 g and 1 cup of water at 237 g. So the 1 g = 1 mL shortcut holds for water and fails for flour, oil and honey. If your recipe gives grams and you have cups, you need the ingredient's own cup weight. The grams to cups converter has those USDA weights for flour, sugar and other common ingredients.
Cups in a liter
A liter is 1,000 mL, so it is 4.2268 US cups or exactly 4 metric cups. For quarts, pints and gallons, see the cups in a gallon page, and for fluid ounces (1 fl oz is 29.574 mL) see the ounces in a cup page.
Frequently asked questions
How do I convert 2/3 cup to mL? Multiply by the cup size. In US customary cups 2/3 cup is 157.73 mL, in labeling cups it is 160 mL and in metric cups it is 166.67 mL.
How many cups is 750 mL? 750 mL is 3.17 US cups, which the chart shows as 3 1/8 cups, or 3 metric cups exactly.
How many cups is 100 mL? 100 mL is 0.42 US cups or 0.40 metric cups. No kitchen fraction fits within 3 percent, so measure it as 6 tablespoons plus 2 teaspoons.
Which is bigger, a milliliter or a cup? A cup. One US cup holds 236.588 mL, so 1 mL is 0.0042 of a cup.
How many mL is 1 cup? 236.588 mL for a US customary cup, 240 mL for the nutrition label cup, 250 mL for a metric cup and 284.131 mL for an Imperial cup.
Conclusion
Converting mL to cups is one division, and the only choice is which cup your recipe means. Pick that cup in the converter and it shows the nearest kitchen fraction. For recipes to try it on, browse the TheSawad cookbooks.