Cups, Grams and Tablespoons Explained
Every baker eventually meets the recipe that fails for no visible reason. Very often the invisible reason is a conversion: cups measure space, grams measure matter, and the bridge between them changes with every ingredient.
The density problem
“How many grams is a cup?” has no single answer. The same 237 ml of space holds:
- All-purpose flour: ~120 g
- Granulated sugar: ~200 g
- Packed brown sugar: ~220 g
- Butter: ~227 g
- Cocoa powder: ~85 g
- Honey: ~340 g
A single “grams per cup” factor applied to everything can be off by a factor of four. Ingredient-specific conversion is the only correct kind.
Flour: the worst offender
Flour compresses. Spooned gently into the cup and leveled, it weighs about 120 g; scooped straight from the bag, the packing pushes it to 140–150 g. That's up to 25% extra flour — enough to turn a tender cookie dense and a batter stiff. It's the single most common cause of “I followed the recipe exactly” failures. Weight has no such ambiguity: 120 g is 120 g however it was handled.
Which cup? The US/metric trap
The word “cup” itself is ambiguous: a US cup is ~237 ml, a metric cup (Australia, NZ) is 250 ml, and old UK recipes may mean the 284 ml imperial half-pint-based cup. A British flapjack recipe made with American cups quietly loses 5% of everything. Check the recipe's origin — or better, find a gram-based version.
The volume hierarchy worth memorizing
- 1 tablespoon = 3 teaspoons ≈ 15 ml
- 1 US cup = 16 tablespoons = 8 fl oz ≈ 237 ml
- 1 stick of butter = 1/2 cup = 8 tbsp ≈ 113 g
These cover the great majority of in-recipe conversions — halving 3/4 cup becomes “6 tablespoons” instead of an awkward fraction.
When precision matters — and when it doesn't
Baking is chemistry: flour, sugar, butter, leaveners and liquids set structure, so weigh them or convert carefully. Cooking is more forgiving — an extra 20 g of onion changes nothing. Spend your precision where the science is.
Convert by ingredient
The cooking converter has an ingredient-aware cups→grams mode (flour, sugars, butter, cocoa, honey and more), plus general volume and weight tabs — and a half-cup column for scaling down. For the fraction arithmetic recipes love to demand, the fraction calculator handles 3/4-of-2/3 without tears.