1 cup of flour, how many grams is that?

125 g. And for the rest of the recipe, it's just below. Converting American measurements to metric, adjusted by ingredient — because a cup of butter doesn't weigh the same as a cup of flour.

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Ingredient (needed to convert volume ↔ weight)

250 ml

≈ 250 g of water

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Quick reference

1 cup = 250 ml (240 ml in the US)

1 tbsp = 15 ml

1 tsp = 5 ml

1 oz = 28.3 g

1 lb = 454 g

350 °F = 175 °C

1 cup flour = 125 g

1 cup sugar = 200 g

1 cup butter = 227 g

Why a cup isn't always 250 ml of everything

American recipes measure by volume, metric recipes by weight. For liquids, the conversion is straightforward. But for dry ingredients, density changes everything: a cup of flour weighs about 125 g, a cup of sugar 200 g, a cup of packed brown sugar 220 g. Defaulting to "1 cup = 250 g" is a guaranteed way to ruin a cake. This converter applies the correct density for each common baking ingredient.