It depends on the ingredient: 1 cup of granulated sugar is 200 g and 1 cup of butter is 227 g. Every common ingredient is in the chart below.
Converter
125 g
That is 4.41 oz by weight.
Type a number — fractions like 3/4 or 1 1/2 work too.
1 cup in grams, by ingredient
One level US cup is 16 tablespoons. The weight depends on what is in the cup.
The one recipes ask about most: 1 cup of flour in grams is 125 g of
all-purpose flour, with ½ cup, tablespoons and a 5 lb bag worked out.
1 cup in grams and ounces for each ingredient
Ingredient
Grams
Ounces
All-purpose flour
125 g
4.41 oz
Granulated sugar
200 g
7.05 oz
Butter
227 g
8.01 oz
Powdered sugar
120 g
4.23 oz
Brown sugar (packed)
220 g
7.76 oz
Milk
244 g
8.61 oz
Water
237 g
8.36 oz
Rice (uncooked)
185 g
6.53 oz
Rolled oats
81 g
2.86 oz
Cocoa powder
86 g
3.03 oz
By volume, 1 cup is 16 tablespoons whatever the ingredient.
Where these numbers come from
All-purpose flour: 125 g per cup — FDC ID 168894, “Wheat flour, white, all-purpose, enriched, bleached”, portion “1 cup”.
Granulated sugar: 200 g per cup — FDC ID 169655, “Sugars, granulated”, portion “1 cup”.
Butter: 227 g per cup — FDC ID 173430, “Butter, without salt”, portion “1 cup”.
Powdered sugar: 120 g per cup — FDC ID 169656, “Sugars, powdered”, portion “1 cup unsifted”.
Brown sugar (packed): 220 g per cup — FDC ID 168833, “Sugars, brown”, portion “1 cup packed”.
Milk: 244 g per cup — FDC ID 171265, “Milk, whole, 3.25% milkfat, with added vitamin D”, portion “1 cup”.
Water: 237 g per cup — FDC ID 173647, “Beverages, water, tap, drinking”, portion “1 serving 8 fl oz”.
Rice (uncooked): 185 g per cup — FDC ID 168877, “Rice, white, long-grain, regular, raw, enriched”, portion “1 cup”.
Rolled oats: 81 g per cup — FDC ID 173904, “Cereals, oats, regular and quick, not fortified, dry”, portion “1 cup”.
Cocoa powder: 86 g per cup — FDC ID 169593, “Cocoa, dry powder, unsweetened”, portion “1 cup”.
Everything else is worked out from those figures: spoons from 1 cup =
16 tablespoons = 48 teaspoons, and ounces and pounds
from their exact definitions (1 oz = 28.349523125 g, 1 lb = 453.59237 g, NIST).