Converting cups to milliliters is one of the most searched kitchen calculations online, and for good reason. Recipes cross borders constantly, and the cup is not a universal unit. A cup in an American recipe and a cup in an Australian recipe differ by 13.4 mL each. That gap grows with every cup in the recipe, and in baking it changes the final texture.

This guide gives you the exact formula, a complete conversion table covering fractions through 16 cups, and a clear breakdown of every major cup standard so you always use the right number.

The Conversion Formula

The formula to convert cups to mL is a single multiplication. Choose the right factor for your cup standard.

US cups formula: mL = cups × 236.588
Example: 3 US cups = 3 × 236.588 = 709.76 mL

Metric cup formula (Australia, NZ, Canada, South Africa): mL = cups × 250
Example: 3 metric cups = 3 × 250 = 750 mL

To convert mL back to cups, divide by the same factor. For US cups divide by 236.588. For metric cups divide by 250.

Quick kitchen rule: Multiply US cups by 240 for a close working estimate. The extra 3.4 mL per cup is negligible in most cooking. For baking, use 236.588 for accuracy.

Cup Standards Around the World

The word “cup” refers to four different volumes depending on where the recipe originates. Using the wrong standard introduces errors that stack up across multiple cups.

Cup Standard	mL per Cup	Where Used
US Customary	236.588 mL	United States recipes and cookbooks
US Legal (FDA)	240 mL	US nutrition labels
Metric	250 mL	Australia, NZ, Canada, South Africa
Imperial	284.13 mL	Pre-1970s UK and Commonwealth recipes

The US customary cup and metric cup differ by 13.4 mL per cup. In a recipe with 4 cups of liquid, that difference reaches 53.6 mL — more than 3 tablespoons. In bread baking that changes dough hydration and alters the crumb structure.

How to identify which cup a recipe uses: If a recipe uses Fahrenheit temperatures, it almost certainly uses US cups. If it uses Celsius and originates from Australia, New Zealand, or South Africa, it uses metric cups (250 mL). Modern UK recipes use grams and mL, not cups.

Full Cups to mL Conversion Table

The table below covers US cups using 236.588 mL per cup and metric cups using 250 mL per cup.

Cups	US mL (236.6)	Metric mL (250)	Liters (US)
0.25 (1/4)	59.1 mL	62.5 mL	0.059 L
0.33 (1/3)	78.1 mL	83.3 mL	0.078 L
0.5 (1/2)	118.3 mL	125 mL	0.118 L
0.75 (3/4)	177.4 mL	187.5 mL	0.177 L
1	236.6 mL	250 mL	0.237 L
1.5	354.9 mL	375 mL	0.355 L
2	473.2 mL	500 mL	0.473 L
2.5	591.5 mL	625 mL	0.592 L
3	709.8 mL	750 mL	0.710 L
3.5	828.1 mL	875 mL	0.828 L
4	946.4 mL	1,000 mL	0.946 L
5	1,182.9 mL	1,250 mL	1.183 L
6	1,419.5 mL	1,500 mL	1.420 L
8	1,892.7 mL	2,000 mL	1.893 L
12	2,839.1 mL	3,000 mL	2.839 L
16	3,785.4 mL	4,000 mL	3.785 L

Common Fractions Converted

Recipes use fraction measurements constantly. Here are the values most used in everyday cooking and baking.

Fraction	Decimal	US mL	Metric mL
1/8 cup	0.125	29.6 mL	31.25 mL
1/4 cup	0.25	59.1 mL	62.5 mL
1/3 cup	0.333	78.9 mL	83.3 mL
1/2 cup	0.5	118.3 mL	125 mL
2/3 cup	0.667	157.7 mL	166.7 mL
3/4 cup	0.75	177.4 mL	187.5 mL
1 cup	1.0	236.6 mL	250 mL

Mistakes to Avoid

Most kitchen measurement errors come from a small set of recurring problems. These four affect cups to mL conversions most often.

1. Assuming all cups are the same

The US customary cup and the metric cup differ by 13.4 mL. That is about a tablespoon. In a 4-cup recipe the total difference reaches 53.6 mL. In baking, where ratios of liquid to flour determine texture, that volume shifts the outcome. Confirm which cup standard your recipe uses before you start.

2. Packing dry ingredients into the measuring cup

Scooping a cup directly into a flour bag compresses the flour. You end up with as much as 25% more flour compared to the spooned-and-leveled method. The cups to mL volume stays constant, but the weight varies by ingredient density. For baking, weigh dry ingredients in grams to remove this variable entirely.

3. Reading liquid cups from above

Liquid forms a curved surface in a measuring cup called a meniscus. Reading from above makes the cup appear fuller than it is. Place the cup on a flat surface and read at eye level, looking at the bottom of the curve. This gives the accurate mL reading marked on the jug.

4. Rounding too early when scaling a recipe

Convert cups to mL first, then scale the recipe from the mL total. Rounding at each step introduces compounding errors. Convert once, scale from the converted total, then round at the end.

The most common error in practice: A recipe calling for 2 metric cups (500 mL) measured with US cups delivers only 473 mL. That 27 mL gap, roughly 1.8 tablespoons, changes batter consistency in cakes and custards.

Dry vs Liquid Measurements

The cups to mL conversion is a volume-to-volume calculation. It applies equally to liquids and dry ingredients. One cup of water and one cup of flour occupy the same volume. They do not weigh the same, because they have different densities.

Ingredient	Volume (1 US Cup)	Weight
Water	236.6 mL	236.6 g
All-purpose flour	236.6 mL	~120 g
Granulated sugar	236.6 mL	~200 g
Butter	236.6 mL	~227 g
Honey	236.6 mL	~340 g
Milk	236.6 mL	~244 g

For liquids in everyday cooking, converting cups to mL is accurate enough without a scale. For dry ingredients in baking, grams remove any dependency on how tightly you fill the cup. Professional bakers measure all ingredients by weight because weight does not vary with technique.

Frequently Asked Questions

How many mL are in 1 cup?

One US cup equals 236.588 mL by the customary definition, or 240 mL by the FDA nutrition labeling standard. A metric cup equals exactly 250 mL. An imperial cup used in pre-1970s UK recipes equals 284 mL. For everyday US cooking, use 240 mL as your working number.

How do I convert cups to mL?

Multiply the number of cups by 236.588 for US cups. For metric cups, multiply by 250. To convert mL back to cups, divide by the same factor. Example: 500 mL divided by 236.588 equals 2.11 US cups.

Is a US cup the same as a metric cup?

No. A US cup is 236.588 mL. A metric cup is 250 mL. The difference is 13.4 mL per cup. Over 4 cups that adds up to 53.6 mL, which is enough to alter the texture of baked goods.

Does the ingredient change the cups to mL conversion?

No. The volume stays constant regardless of ingredient. One cup of water and one cup of flour both equal 236.6 mL. Their weights differ because their densities differ, but the mL value does not change.

How many mL is half a cup?

Half a US cup equals 118.294 mL, commonly rounded to 118 mL in recipes. Half a metric cup equals exactly 125 mL.

Why do some sources say 240 mL per cup instead of 236.588?

240 mL is the US legal cup defined by the FDA for nutrition labeling. For cooking, the 3.4 mL difference is negligible. For precise baking or scientific work, use 236.588 mL.

How many cups is 250 mL?

250 mL equals exactly 1 metric cup, used in Australia, New Zealand, Canada, and South Africa. In US cups, 250 mL equals approximately 1.057 cups, or just over 1 cup.

Can I use a regular drinking cup to measure?

No. Drinking cups vary from around 200 mL to over 350 mL. For accurate conversions, always use a calibrated measuring cup with mL markings, or weigh ingredients on a kitchen scale.