Short answer: if you're baking from an American recipe, cup measurements are the part most likely to trip you up — not because your measuring cups are wrong, but because "1 cup" isn't one fixed amount and can't convert to grams with a single number anyway. For liquids, a US recipe cup and the cup engraved on most UK measuring sets are close but not identical. For dry ingredients like flour and sugar, the same cup holds a different weight depending on what's in it, so the only way to get a genuinely precise result is to weigh the important ingredients rather than scoop them.
A US "cup" and a UK-sold "cup" aren't quite the same size
A standard American recipe cup is 240ml, according to consumer body Which?, which publishes a widely used US-to-UK conversion guide for home cooks. Many measuring cup sets sold in the UK — including copper and stainless steel sets — are engraved in the rounder metric measure of 250ml per cup, which is the convention used across Europe and Australia. That's only a 4% difference on a single cup, but it adds up: four cups of liquid in an American recipe comes to roughly 960ml, while four cups measured on a 250ml-marked set gives you 1000ml. For a loose soup or a stew that's nothing to worry about. For a delicate sponge or a choux pastry, it's enough to change the texture.
Cups can't convert to grams with one universal number
The reason recipe websites publish long conversion tables instead of a single "1 cup = X grams" rule is that a cup measures volume, and different ingredients pack into that volume at different densities. UK food magazine delicious. lists 1 cup of plain flour as 125g, while 1 cup of caster or granulated sugar comes to 200g — a 60% difference for the exact same size of cup. Butter, cocoa powder and oats each land somewhere else again. So a cup measure only tells you the true weight once you already know which specific ingredient you're scooping, which is exactly why a set of kitchen scales is the more reliable tool whenever a bake depends on getting the ratios right.
Which recipes actually need this level of precision?
Not every dish needs weighing to the gram. Pancake batter, soups, stews, smoothies and most sauces are forgiving enough that measuring cups alone will get you a good result, and this is where cups genuinely earn their keep — they're quick, they don't need a plug socket, and they're easy to rinse between wet and dry ingredients. Where precision starts to matter is anything with a tight structure to hold: bread doughs, choux pastry, macarons, and enriched cakes where too much or too little flour changes whether the bake rises, holds its shape, or turns out dense. If an American recipe you're following falls into that second group, that's the moment to reach for a scale and a published gram conversion rather than trusting the cup alone.
Using measuring cups and spoons alongside an American recipe
The practical approach most UK bakers settle on is a hybrid one: use cups for the liquids and the forgiving ingredients, and switch to grams for the ingredient that actually defines the structure of the bake — usually the flour. Our copper measuring cups and spoons set is engraved with both cup and millilitre markings on every piece, in sizes from a quarter cup up to a full cup, plus a matching set of teaspoons and tablespoons, so it covers the liquid and small-quantity side of a recipe well. It's stainless steel underneath the copper plating, so it holds its shape and its markings for years, and every Good For You product carries a 2-year warranty — if a piece ever works loose, we replace that piece rather than you having to replace the whole set.
Bake Off season is a good excuse to get this right
The Great British Bake Off is back on Channel 4 for series 17, and nothing sends people to the kitchen quite like an hour of choux pastry drama on a Tuesday night. If you're trying an American baker's recipe you've seen online this season, the flour-to-grams switch above is the single change most likely to make it turn out the way it's supposed to. And once a bake is out of the oven and cooling, our glass meal prep containers are a genuinely useful way to keep a batch of biscuits, traybakes or Bake-Off-inspired sponge fresh for the following few days — the airtight lids and LFGB-certified glass keep flavour and moisture in far better than resting a tea towel over a plate.
Copper is also the traditional gift for a 7th wedding anniversary, and our copper measuring cups and spoons set — cups, spoons and a copper foiled gift box included — is one we regularly see bought for that reason as well as for keen bakers who've caught the Bake Off bug. If you're shopping early for Christmas, it's already tagged for that too.
Frequently Asked Questions
How many ml is a standard American recipe cup?
A standard US recipe cup is 240ml, according to consumer body Which?. Many measuring cup sets sold in the UK are marked in the rounder metric cup of 250ml, so a US recipe's "1 cup" is slightly smaller than the cup engraved on a UK-bought set.
How many grams is a cup of plain flour?
UK food magazine delicious. lists 1 cup of plain flour as 125g. This figure is specific to flour — it isn't a general "cups to grams" rule, because different ingredients pack into the same cup at different densities.
How many grams is a cup of sugar?
According to delicious. magazine, 1 cup of caster or granulated sugar is 200g, noticeably heavier than the same cup of flour at 125g. This is why a single cup-to-gram conversion doesn't work across every ingredient in a recipe.
Do I need kitchen scales, or are measuring cups accurate enough?
Measuring cups are accurate enough for forgiving recipes like soups, stews, pancake batter and smoothies. For bakes with a tight structure — bread, choux pastry, macarons, delicate sponges — weighing the flour and other structural ingredients in grams gives a far more consistent result than scooping by volume.
Can I still use measuring cups and spoons with an American recipe?
Yes — cups and spoons are genuinely useful for the liquid and small-quantity ingredients in an American recipe, such as milk, oil, vanilla extract or baking powder. The main adjustment worth making is switching the main dry ingredient, usually flour, to a gram measurement from a published conversion chart.
Is a copper measuring cup and spoon set a good gift?
Yes — copper is the traditional 7th wedding anniversary gift, and a copper measuring cup and spoon set presented in a gift box is a popular choice for that occasion as well as for anyone who bakes regularly, including as a Christmas present.