Ingredient Weight Converter · sweetener
Light Brown Sugar: cups to grams
1 cup of light brown sugar weighs 213 grams. Use the converter below for any other amount, or check the quick-reference table.
By Andrew Flores, Editor and publisher, Nathan Management. Last reviewed .
Density source: USDA FoodData Central, cross-checked against the King Arthur Baking weight chart. How these figures are derived and corrected is documented in our editorial standards.
Light Brown Sugar baseline: 1 cup = 213 g.
Common amounts
| Cups | Tablespoons | Grams | Ounces (weight) | Milliliters |
|---|---|---|---|---|
| 1/4 cup | 4.0 | 53 g | 1.88 oz | 59 mL |
| 1/3 cup | 5.3 | 71 g | 2.50 oz | 79 mL |
| 1/2 cup | 8.0 | 107 g | 3.76 oz | 118 mL |
| 2/3 cup | 10.7 | 142 g | 5.01 oz | 158 mL |
| 3/4 cup | 12.0 | 160 g | 5.64 oz | 177 mL |
| 1 cup | 16.0 | 213 g | 7.51 oz | 237 mL |
| 1.5 cups | 24.0 | 320 g | 11.27 oz | 355 mL |
| 2 cups | 32.0 | 426 g | 15.03 oz | 473 mL |
| 3 cups | 48.0 | 639 g | 22.54 oz | 710 mL |
| 4 cups | 64.0 | 852 g | 30.05 oz | 946 mL |
Spoon weights
Derived from the same 213 g per cup — a US tablespoon is 1/16 of a cup and a teaspoon is 1/48.
| Amount | Grams |
|---|---|
| 1 tablespoon | 13 g |
| 1 teaspoon | 4.4 g |
| 1/2 teaspoon | 2.2 g |
| 1/4 teaspoon | 1.1 g |
Light Brown Sugar at a glance
- Molasses content
- roughly 3.5% — the coating, not the crystal, is what changes
- 1 lb bag yields
- about 2 1/8 cups packed (454 g ÷ 213 g)
- It is acidic
- Brown sugar reacts with baking soda; swapping it for white sugar can change how a recipe rises
What a cup of light brown sugar actually weighs
The published 213 g assumes one specific way of filling the cup. Here is what the same cup weighs under the other common handling methods and product forms, and how far off the recipe you end up.
| How it was measured | Grams per cup | vs. published | Why |
|---|---|---|---|
| Firmly packed — what recipes mean | 213 g | published figure | Pressed down with the back of a spoon until it holds the cup's shape when turned out. |
| Scooped loose, not packed | 165 g | -23% | The molasses makes the crystals clump, so an unpacked cup is mostly air pockets. This is a 25% shortfall the recipe never accounted for. |
Why measuring light brown sugar by cup goes wrong
Brown sugar is granulated sugar coated with molasses. The molasses is what makes it clump and what makes the recipe say 'packed.' Light brown sugar firmly packed runs about 213 grams per cup. Loose, scooped brown sugar can be as little as 165 grams in the same cup — a 25 percent error that the recipe author absolutely did not expect.
Practical tips for working with light brown sugar
To pack brown sugar, scoop it into the cup and press it down with the back of a spoon until it holds its shape when you turn the cup over. If the sugar has hardened in the bag, microwave it for 15 seconds with a damp paper towel laid on top — the steam softens it without melting. A slice of bread or apple in the bag overnight does the same thing more slowly.
Note from this ingredient's record: Firmly packed. When a recipe says 'packed,' press the sugar into the cup with the back of a spoon until it holds the cup's shape when turned out.
Substitutions that work — and what they cost you
Make it from white sugar
Ratio: 1 cup granulated sugar plus 1 tablespoon molasses
Trade-off: Mix until no pale streaks remain. Slightly wetter than commercial brown sugar, and it clumps faster.
Dark brown sugar
Ratio: 1:1 packed
Trade-off: More molasses: chewier, moister, more caramel flavor, and slightly more acid for the baking soda to work on.
When light brown sugar ruins the recipe
| What you see | What went wrong | What to do |
|---|---|---|
| Cookies came out dry and crumbly instead of chewy | Brown sugar measured loose instead of packed — up to 48 g short per cup. | Pack it into the cup, or weigh 213 g. |
| The bag has set into a brick | The molasses coating lost its moisture to the air. | Microwave 15–20 seconds under a damp paper towel for immediate use, or seal it overnight with a slice of bread for a permanent fix. |
Storing light brown sugar
Airtight is the whole game — brown sugar hardens because it dries out, not because it spoils. A terracotta sugar saver or a slice of bread in the bag keeps it scoopable for months.
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