Cups to Millilitres Converter
Convert cups to millilitres with precision for all your baking and cooking needs. Whether you’re following an American recipe or need to convert between different cup standards, this converter handles US customary cups, metric cups, and Imperial cups with accurate results every time.
Types of Cups Explained
The term “cup” as a volume measurement varies significantly depending on the measurement system. Understanding these differences is vital for achieving accurate results in recipes, particularly when converting between US, metric, and Imperial measurements.
US Customary Cup
The US customary cup equals precisely 236.588 mL, though it’s commonly rounded to 237 mL or 240 mL in recipes and on nutrition labels. This is the most frequently encountered cup measurement in American cookbooks and online recipes. One US cup contains exactly 8 fluid ounces or 16 tablespoons.
Metric Cup
The metric cup is standardised at 250 mL and is widely adopted in Australia, New Zealand, Canada, and increasingly in the UK. This measurement simplifies conversions within the metric system and is particularly convenient for scaling recipes. Many modern measuring cup sets sold in the UK feature metric cup measurements.
Imperial Cup
The Imperial cup, historically used in the UK, equals 284.131 mL. Whilst less common in contemporary British kitchens, you may encounter this measurement in older cookbooks or traditional recipes. The Imperial system is based on the Imperial pint (568 mL), with one Imperial cup being half a pint.
Conversion Formulae
US Cup to Millilitres
Example: 2 cups × 236.588 = 473.18 mL
Metric Cup to Millilitres
Example: 1.5 cups × 250 = 375 mL
Imperial Cup to Millilitres
Example: 0.5 cups × 284.131 = 142.07 mL
Common Cup to Millilitre Conversions
| Cups | US (mL) | Metric (mL) | Imperial (mL) |
|---|---|---|---|
| 1/8 | 30 | 31 | 36 |
| 1/4 | 59 | 63 | 71 |
| 1/3 | 79 | 83 | 95 |
| 1/2 | 118 | 125 | 142 |
| 2/3 | 158 | 167 | 189 |
| 3/4 | 177 | 188 | 213 |
| 1 | 237 | 250 | 284 |
| 1.5 | 355 | 375 | 426 |
| 2 | 473 | 500 | 568 |
| 3 | 710 | 750 | 852 |
| 4 | 946 | 1000 | 1136 |
Visual Volume Comparison
US Cup
237 mL
Metric Cup
250 mL
Imperial Cup
284 mL
The visual representation above illustrates the relative volume differences between the three cup standards. The Imperial cup holds approximately 20% more liquid than a US cup, whilst the metric cup sits between them at 250 mL.
Baking Measurements in Millilitres
When baking, precise measurements matter. Here are common baking ingredient volumes converted to millilitres, based on US cup measurements which are most prevalent in online recipes.
| Ingredient | 1 Cup (mL) | 1/2 Cup (mL) | 1/4 Cup (mL) |
|---|---|---|---|
| Water | 237 | 118 | 59 |
| Milk | 237 | 118 | 59 |
| Vegetable Oil | 237 | 118 | 59 |
| Honey | 237 | 118 | 59 |
| Double Cream | 237 | 118 | 59 |
| Buttermilk | 237 | 118 | 59 |
Note that whilst the volume in millilitres remains constant for liquids, the weight in grammes varies considerably depending on the ingredient’s density. For example, 237 mL of water weighs 237 grammes, but 237 mL of honey weighs approximately 340 grammes due to its higher density.
International Recipe Adaptation
When adapting recipes from different countries, recognising which cup standard the original recipe employs prevents measurement errors. American recipes invariably use US cups, whilst Australian and New Zealand recipes typically use metric cups. For older British recipes published before metrication, Imperial cups may appear.
Recipe Conversion Strategy
If you’re working with a US recipe and have metric measuring cups, add approximately 5-6% more liquid than the metric cup indicates, or simply use 240 mL as one cup. For most home baking, this minor difference won’t significantly affect outcomes. However, for precise patisserie work or bread making, exact conversions matter.
Many professional bakers recommend weighing ingredients in grammes rather than measuring by volume, as this eliminates ambiguity and produces more consistent results, especially for dry ingredients where settling and packing affect volume measurements.
Millilitres to Cups Conversion
| Millilitres | US Cups | Metric Cups | Imperial Cups |
|---|---|---|---|
| 50 mL | 0.21 | 0.20 | 0.18 |
| 100 mL | 0.42 | 0.40 | 0.35 |
| 150 mL | 0.63 | 0.60 | 0.53 |
| 200 mL | 0.85 | 0.80 | 0.70 |
| 250 mL | 1.06 | 1.00 | 0.88 |
| 300 mL | 1.27 | 1.20 | 1.06 |
| 500 mL | 2.11 | 2.00 | 1.76 |
| 750 mL | 3.17 | 3.00 | 2.64 |
| 1000 mL | 4.23 | 4.00 | 3.52 |
Frequently Asked Questions
How many millilitres are in one cup?
This depends on the cup type. A US customary cup contains 237 mL, a metric cup holds 250 mL, and an Imperial (UK) cup equals 284 mL. Most modern recipes from the UK use metric cups at 250 mL.
Can I use a US cup measurement in British recipes?
Yes, but be aware that US cups (237 mL) hold slightly less than metric cups (250 mL). For most recipes, this 13 mL difference won’t substantially affect results, but precision baking may require adjustment. If following an American recipe in the UK, use 240 mL as a practical equivalent.
Why do different countries use different cup sizes?
Historical measurement systems evolved independently. The US retained its customary units based on the older British Imperial system, whilst most Commonwealth nations adopted the metric system in the 1970s. The UK Imperial cup derives from the Imperial pint (half a pint equals one cup), whereas the metric cup represents a quarter litre.
Should I measure flour in cups or millilitres?
Cups measure volume, not weight. For flour and other dry ingredients, professional bakers recommend weighing in grammes for accuracy, as the amount of flour in a cup varies with how it’s filled (sifted, spooned, or scooped). However, if a recipe specifies cups, convert the volume to millilitres then measure the liquid displacement.
How do I convert recipes from cups to litres?
Divide the millilitre result by 1000. For example, 4 US cups equals 946 mL, or approximately 0.95 litres. For metric cups, 4 cups equals exactly 1 litre (4 × 250 mL = 1000 mL).
Are measuring cups the same as teacups or coffee cups?
No. Standard teacups and coffee mugs vary widely in capacity, typically holding 150-350 mL. Measuring cups are calibrated instruments designed for precise volume measurement. Always use proper measuring cups for recipes rather than drinking vessels.
What’s the difference between liquid and dry measuring cups?
Liquid measuring cups usually feature a spout and graduated markings, allowing you to pour liquids and read measurements at eye level. Dry measuring cups are designed to be filled and levelled off with a straight edge. However, when converting cups to millilitres, the volume remains identical regardless of whether you’re measuring liquids or dry ingredients.
How many tablespoons equal one cup in millilitres?
One US cup contains 16 tablespoons. Since one US tablespoon equals approximately 14.8 mL, 16 tablespoons total 237 mL. In the metric system, one tablespoon is often standardised at 15 mL, making 16 tablespoons equal to 240 mL.