It depends on the ingredient: 1¼ cups of granulated sugar is 250 g and 1¼ cups of butter is 283.8 g. Every common ingredient is in the chart below.
Converter
156.3 g
That is 5.51 oz by weight.
Type a number — fractions like 3/4 or 1 1/2 work too.
1¼ cups in grams, by ingredient
One level US cup is 16 tablespoons. The weight depends on what is in the cup.
Recipes write this as 1 1/4 cups, which is easy to misread.
A quarter cup (1/4 cup) is a fifth as much: flour 31.3 g, sugar 50 g, butter 56.8 g.
1¼ cups in grams and ounces for each ingredient
Ingredient
Grams
Ounces
All-purpose flour
156.3 g
5.51 oz
Granulated sugar
250 g
8.82 oz
Butter
283.8 g
10 oz
Powdered sugar
150 g
5.29 oz
Brown sugar (packed)
275 g
9.7 oz
Milk
305 g
10.8 oz
Water
296.3 g
10.4 oz
Rice (uncooked)
231.3 g
8.16 oz
Rolled oats
101.3 g
3.57 oz
Cocoa powder
107.5 g
3.79 oz
By volume, 1¼ cups is 20 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).