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UK Cup to Milliliter Converter

Enter UK cups to convert to milliliters.

How it is calculated

The conversion is a single multiplication: mL = cups × 284.130625 and L = mL ÷ 1000. The factor is exactly half an imperial pint, which is how the UK cup is defined here. Cups can be whole or decimal, so a quarter cup is 0.25. Millilitres are shown with two decimals and litres with four. The tool does not round to kitchen-friendly amounts, so you will see values like 71.03 mL for a quarter cup, and it accepts any number, including negatives, without complaint. This is the UK imperial cup only. The US cup (236.59 mL) is about 17% smaller, and metric cups used in some countries are different again, so check which cup your recipe means.

Worked example

A recipe calls for 1.5 UK cups of milk. Millilitres: 1.5 × 284.130625 = 426.1959 mL, shown as 426.20 mL. Litres: 426.1959 ÷ 1000 = 0.4262 L. On a metric jug, fill to a little under the 430 mL line.

Try this example →

Common mistakes

  • Using the UK factor for a recipe written with US cups. A US cup is roughly 17% smaller, so cakes and breads can come out too wet or too heavy.
  • Typing a fraction such as 1/2 or 1 1/2. Enter decimals instead, 0.5 or 1.5.
  • Mixing up fluid and dry cups. The conversion gives a liquid volume; for flour or sugar the weight of one cup varies, so it cannot be turned into grams from this figure.
  • Treating a rounded result as exact for small amounts. 71.03 mL for a quarter cup is fine for a jug, but for tiny amounts of strong ingredients such as baking powder, use spoon measures from the recipe.

About this calculator

The UK imperial cup is a cooking measure equal to 284.13 mL (10 imperial fluid ounces) — noticeably larger than the US cup (236.59 mL) that appears in most American recipes and measuring cups sold internationally. This converter multiplies the number of UK cups by that fixed factor to give milliliters, and divides by 1000 for liters.

Bakers and cooks following older British or Commonwealth recipes that still specify "cups" need this conversion to use a standard metric measuring jug accurately, since substituting a US cup measure for a UK cup — or vice versa — throws off ratios in baking recipes where precision matters most.

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Comments (1)

  • Editorial team

    This converts volume only, and a cup of flour, sugar or butter does not weigh the same from one cook to the next because it depends on how it is packed. For baking where precision matters, convert the volume here and then weigh the ingredient if the recipe or a trusted source gives grams. Also note the factor is half an imperial pint, so a recipe that clearly means a 250 mL metric cup needs a different figure. Which old recipe are you converting?

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