The Short Answer
So 100 grams of packed brown sugar comes to just under ½ cup, and 250 grams is about 1⅛ cups. This is the number to use whenever a recipe simply says "brown sugar" without further instruction — packed is the default assumption in the overwhelming majority of American recipes.
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Why Brown Sugar Needs Two Different Numbers
According to the USDA FoodData Central composition data, brown sugar is essentially granulated sugar with molasses added back in — typically somewhere between 3.5% and 6.5% molasses by weight for light and dark varieties. Molasses is thick, sticky, and hygroscopic (it actively attracts and holds onto moisture), which is exactly why brown sugar clumps instead of pouring freely like white sugar. That stickiness is also why brown sugar's volume changes so dramatically depending on how it's handled:
| Fill Method | Grams per Cup | Behavior |
|---|---|---|
| Packed (pressed firmly) | ~220 g | Holds the shape of the cup when tipped out |
| Unpacked (loose fill) | ~160 g | Collapses loosely, doesn't hold shape |
That's roughly a 27% difference between the two — far more than the packing variance you'd see with something like flour or granulated sugar. If a recipe was developed assuming a packed cup and you measure it loose instead, you're effectively adding almost a quarter less brown sugar than the recipe intended, which shows up as drier, less chewy, less caramelized results See more about almonds grams to cups conversion.
The Sandcastle Test
The traditional way bakers confirm they've packed a cup correctly: press the brown sugar in firmly with the back of a spoon, level off the top, then tip the cup upside down. Properly packed brown sugar should hold its shape like a small sandcastle rather than crumbling apart. If it collapses, it wasn't packed firmly enough — and the actual weight in the cup was probably closer to the loose-fill figure than the packed one.
Grams to Cups Chart (Packed vs. Unpacked)
| Grams | Cups (Packed, 220g/cup) | Cups (Unpacked, 160g/cup) |
|---|---|---|
| 25 g | 0.11 cup | 0.16 cup |
| 55 g | ¼ cup | ~⅓ cup |
| 110 g | ½ cup | ~⅔ cup |
| 165 g | ¾ cup | ~1 cup |
| 220 g | 1 cup | 1⅜ cups |
| 300 g | ~1⅜ cups | ~1⅞ cups |
| 440 g | 2 cups | 2¾ cups |
| 500 g | ~2¼ cups | ~3⅛ cups |
Not All Brown Sugar Is the Same, Either
Beyond the packing question, brown sugar itself comes in a few distinct types that differ in both density and flavor intensity:
| Type | Grams per Cup (packed) | Molasses Content | Best For |
|---|---|---|---|
| Light brown sugar | ~215 g | ~3.5% | Everyday baking — cookies, muffins, banana bread |
| Dark brown sugar | ~225 g | ~6.5% | Gingerbread, barbecue sauce, deep caramel flavor |
| Muscovado sugar | ~220 g | ~13%+ | British-style baking, treacle desserts, intense molasses flavor |
| Demerara sugar | ~200 g | ~2% | Crumble toppings, coffee — large crystals, not for smooth batters |
Light and dark brown sugar can generally substitute for each other by weight without ruining a recipe, but they aren't flavor-identical — dark brown sugar brings noticeably more molasses depth, which matters in recipes like gingerbread where that flavor is the point.
Where Brown Sugar Shows Up (and Why the Amount Matters)
Brown sugar isn't just "sweeter white sugar" — the molasses changes texture, moisture, and browning in ways that make the correct amount genuinely important to a recipe's outcome:
- Cookies: molasses moisture is a major reason chewy cookies (chocolate chip, oatmeal) stay soft — too little brown sugar and they turn crisp and dry instead of chewy.
- Quick breads: banana bread and spice cakes rely on brown sugar's moisture retention; underfilling the cup tends to leave the crumb drier and less rich.
- Barbecue sauce and glazes: brown sugar contributes body and stickiness, not just sweetness — a thin, underwhelming glaze is often a brown-sugar-measurement problem, not a recipe problem.
- Gingerbread and dark bakes: these recipes are usually built around dark brown sugar specifically, since the stronger molasses flavor is part of the intended taste.
Quick Recipe Reference
| Recipe | Typical Amount | Grams (packed) |
|---|---|---|
| Chocolate chip cookies (24) | ¾ cup | ~165 g |
| Banana bread (1 loaf) | ⅔ cup | ~150 g |
| Barbecue sauce (~400 ml) | ½ cup | ~110 g |
| Sticky toffee pudding (6) | 1 cup | ~220 g |
| Gingerbread cookies (24) | ~⅞ cup | ~200 g |
How to Measure Packed Brown Sugar Correctly
Assume "packed" unless told otherwise.
If a recipe just says "brown sugar," treat it as packed — that's the near-universal default in US baking.
Spoon the sugar into the cup
rather than scooping directly from the bag, which gives more control over clumping.
Press firmly with the back of a spoon
as you fill, working out air pockets until the sugar is dense.
Level the top and run the sandcastle test
described above to confirm it's packed correctly.
When precision matters, weigh it instead.
220 grams removes the packing guesswork entirely — no sandcastle test needed, no wondering whether you pressed hard enough.
Quick Reference
- 55 g packed brown sugar = ¼ cup
- 110 g packed brown sugar = ½ cup
- 220 g packed brown sugar = 1 cup
- 440 g packed brown sugar = 2 cups
The Bottom Line
Brown sugar is one of the few ingredients where the method matters as much as the amount — a packed cup (220 g) and a loose cup (160 g) aren't a rounding difference, they're nearly a quarter apart. When a recipe just says "brown sugar," pack it. When precision genuinely matters — chewy cookies, sticky glazes, anything where texture depends on getting the moisture right — weighing the sugar directly is the only way to remove the guesswork entirely. For conversions involving plain granulated or powdered sugar instead, see our sugar grams to cups guide, where packing isn't nearly as large a factor.
Other Ingredients
Grams-to-cups conversion isn't only useful for oats. Each of these has its own weight-per-cup because densities differ: