Imagine you find an enticing scone recipe on a British blog or a classic lamington formula from Australia. You grab your American measuring cups, carefully follow the measurements, pop the tray into the oven, and end up with a disappointing texture. The culprit? A cup is not the same size around the world.

The 4 Major World Cup Sizes Compared

1. US Customary Cup (236.59 ml / 8 fl oz)

236.6 ml

The historical American cup based on 8 US fluid ounces. Common in domestic kitchens and vintage family recipe boxes across the United States.

2. US Legal / Nutrition Cup (240 ml)

240.0 ml

Established by the FDA for standardized nutrition facts labeling and modern calibrated measuring cups sold in North America today.

3. Metric Cup (250 ml)

250.0 ml

The standard metric cup utilized in Australia, New Zealand, Canada, and modern British recipe portals. It holds exactly 250 grams of pure water.

4. UK Imperial Cup (284.13 ml / 10 imperial fl oz)

284.1 ml

Found in mid-20th-century British cookbooks. Represents exactly half an Imperial pint (10 Imperial fluid ounces). It is over 20% larger than a US cup!

How Much Difference Does it Make?

If an old British recipe calls for 2 cups of flour and you use standard American 240ml cups, you will add 240 grams of flour instead of the intended 284 grams—a deficit of 44 grams! That turns what was meant to be a thick scone dough into a runny, unmanageable batter.

That is why our Cups To Grams converter provides a dedicated Cup Standard / Country selector, allowing you to instantly align with whichever regional standard your recipe author utilized.