How Much Does a Cup of Flour Weigh? Why Baking Needs a Scale
One cook's cup of flour is 120 g, another's is 160 g. That uncertainty in volume measures is a classic cause of baking failures.
If you've ever followed a recipe and produced a brick-like cake, the recipe probably wasn't wrong — the question is how much “one cup” really was.
Where volume measurement goes wrong
- How you fill it: flour scooped straight from the bag is denser than flour sifted and leveled — often by more than 20%.
- Ingredient state: whether flour is sifted, sugar is packed, or butter is softened all change the volume.
- Different cups: a “cup” isn't universal — about 240 mL in the US, about 200 mL in Japan.
Reference conversions
- All-purpose flour: 1 cup ≈ 120–130 g (sifted and leveled)
- Granulated sugar: 1 cup ≈ 200 g
- Butter: 1 cup ≈ 227 g; 1 tablespoon ≈ 14 g
- Milk/water: 1 cup ≈ 240 mL ≈ 240 g
- Honey/syrup: 1 cup ≈ 340 g (far denser)
Treat these as approximations; brands and technique shift them. For precise conversion, use the cooking units converter.
Why weighing is better
A digital scale costs little and usually reads to 1 g. Weights are fully repeatable, unaffected by how you scoop, and let you share a recipe without ambiguity — which is why professional formulas are written in grams.
When cups are fine
Not every dish needs weighing. Stir-fries, stews, and soups are forgiving: volume measures are plenty and adjusting by feel is more flexible. Reserve the scale for baking, sauces, and desserts where ratios matter.