Cups to Grams: Why the Ingredient Matters

There is no single number of grams in a cup. A cup is a measure of space, about 240 ml in the American system, and what that space weighs depends entirely on what you put in it. Flour is light and full of air; sugar is dense; butter is denser still.

Pick the ingredient and get the weight in grams: Cups to Grams Calculator

That spread is why a recipe converted with a single “1 cup = 125 g” rule works for flour and ruins a caramel. Going the other way is the same problem in reverse: Grams to Cups Converter.

Flour compacts. Scooping a cup straight from the bag can pack in noticeably more than spooning it in loosely and levelling it off, and American recipes generally assume the loose method. That variation is a real difference in a cake, and it is the single strongest argument for weighing.

If you own kitchen scales, converting the recipe once and writing the grams in the margin is quicker and more reliable than measuring cups every time you make it.

Butter in sticks. One stick is a quarter of a pound, not a cup: Butter Sticks to Grams.

Two different fluid ounces. The US fluid ounce and the imperial fluid ounce are not the same size, so a pint is not the same either: ml to Fluid Ounces.

Tablespoons. UK, US and Australian tablespoons differ, which matters for raising agents and salt: Spoons to ml.

Oven temperatures in Fahrenheit, usually for a conventional oven. Convert them before you set a fan oven.

Doing this ingredient by ingredient is slow. Convert the whole ingredient list in one go instead, then keep the metric version.

For a full ingredient list: US Recipe to UK Converter

Using one conversion factor for everything. The ingredient is the whole point.

Measuring sticky things in cups. Honey, syrup and yoghurt cling to the cup; weighing them avoids losing a spoonful to the washing up.

Assuming a UK cup exists. British recipes work in grams and millilitres. If a recipe says “cup”, it almost certainly means the American one.