1/3 Cup of Brown Sugar in Grams
1/3 cup of brown sugar (packed) weighs 71 grams (about 2.5 oz), based on 213 g per US cup (packed into the cup). That's the same as 5.3 tablespoons of brown sugar (packed). When a recipe's outcome depends on accuracy — especially baking — weigh it instead of measuring by cup.
Brown Sugar — all cup fractions in grams
| Cups | Grams | Ounces |
|---|---|---|
| ¼ cups | 53 g | 1.9 oz |
| ⅓ cups | 71 g | 2.5 oz |
| ½ cups | 107 g | 3.8 oz |
| ⅔ cups | 142 g | 5 oz |
| ¾ cups | 160 g | 5.6 oz |
| 1 cup | 213 g | 7.5 oz |
| 1½ cups | 320 g | 11.3 oz |
| 2 cups | 426 g | 15 oz |
How to measure 1/3 cup of brown sugar (packed)
Brown sugar is always measured packed: press it firmly into the cup until it holds the cup’s shape when turned out. Packed is 213 g per cup; loosely filled can weigh 25% less, which noticeably changes moisture and spread in cookies.
1/3 cup of other ingredients
- 1/3 cup all-purpose flour in grams — 40 g
- 1/3 cup granulated sugar in grams — 67 g
- 1/3 cup powdered sugar in grams — 40 g
- 1/3 cup honey in grams — 113 g
- 1/3 cup butter in grams — 76 g
Convert another amount
250 cups Light brown sugar (packed) = 53250 g
Based on 213 g per US cup.
Reverse conversion: grams of brown sugar to cups.
Density 213 g/cup — sources: King Arthur Baking ingredient weight chart, USDA FoodData Central. Data verified 2026-08-20. Methodology.