Grams vs cups: why weighing wins

The problem with cups

A cup measures volume, not mass. The same cup of flour weighs 110 g spooned-and-levelled, but up to 150 g scooped-and-packed — a 35 % error that ruins cakes before the oven is even on.

Density is the missing variable

Every converter on this site uses the measured density of each ingredient — flour 0.53 g/ml, sugar 0.85 g/ml, honey 1.42 g/ml. That is why « 1 cup = 240 g » charts are wrong: the answer depends on what is in the cup.

• All-purpose flour — 0.529 g/ml
• Granulated sugar — 0.845 g/ml
• Honey — 1.42 g/ml

Cup conventions differ

A US cup is 236.6 ml, a metric cup 250 ml, an imperial cup 284 ml, a Japanese cup 200 ml. American recipes assume the first; European kitchens the second — an 6 % gap before you even start.

When cups are fine

For liquids and forgiving cooking (soups, stews, batters you adjust by feel), cups are fast and adequate. Baking is where the margin disappears — yeast, gluten and sugar ratios punish 10 % errors.

How to switch

A €15 digital scale with 1 g precision is the single highest-leverage tool in a home kitchen. Convert your five most-used recipes once with our ingredient pages, write the grams on the card, done.