How to Measure Brown Sugar: What "Packed" Really Means
How to pack brown sugar into a measuring cup, why recipes say packed, how many grams a cup holds, how much is in a 1 lb box, and how to deal with hardened sugar.
Brown sugar is the one sugar where the way you fill the cup changes the answer. Granulated sugar pours and settles the same way every time, but brown sugar is damp with molasses, so it can be pressed down hard or left loose, and a cup of it can hold very different amounts. This guide explains what recipes mean, how to pack a cup correctly, and what to do when you would rather weigh.
Why recipes say "packed"
The molasses coating on brown sugar crystals makes them clump and cling together. Spooned loosely into a cup, they leave air gaps. Pressed in firmly, they close up. Recipe writers almost always develop their recipes with firmly packed brown sugar, so when a recipe just says "1 cup brown sugar" it usually means packed, even if the word is missing.
On this site, a cup of packed brown sugar is 213 g. A loosely filled cup holds noticeably less, which is why a recipe measured loosely can taste less sweet and bake up drier than intended. Our guide to recipe measuring terms covers "packed" alongside sifted, scant and heaping.
How to pack brown sugar into a cup
- Break up lumps first. Fluff the sugar with a fork so you are not trapping big clumps and voids.
- Spoon it in and press. Add sugar to a dry measuring cup a little at a time, pressing down with the back of a spoon or your fingers as you go.
- Fill to the rim and level. Keep adding and pressing until the sugar is level with the top, then scrape off any excess with a knife.
- Check it. Turn the cup out. The sugar should hold the shape of the cup like a small sandcastle. If it collapses into loose crumbs, it was not packed enough.
"Firmly" means firmly, but you are not compacting it into a brick. Pressing hard enough to make the sugar hold together is the target.
Light versus dark brown sugar
Light brown sugar has less molasses than dark, and dark brown sugar is a little moister and more strongly flavored. For measuring, the difference is small enough that most recipes and conversion charts treat them the same, and so does this site: use 213 g per packed cup for either. Swapping one for the other in a recipe changes flavor and chewiness more than it changes the amount. If you only have one kind and need the other, our baking substitutions guide shows how to make brown sugar from granulated sugar and molasses.
Brown sugar compared with other sugars, cup for cup
| Sugar (1 cup) | Grams |
|---|---|
| Brown sugar, packed | 213 g |
| Granulated sugar | 200 g |
| Powdered sugar | 120 g |
Packed brown sugar is a little heavier than granulated per cup, so swapping one for the other cup for cup shifts the weight by about 6%. Powdered sugar is far lighter and should never be swapped for either by volume.
Common amounts in grams
| Packed brown sugar | Grams |
|---|---|
| 1/4 cup | 53 g |
| 1/3 cup | 71 g |
| 1/2 cup | 107 g |
| 3/4 cup | 160 g |
| 1 cup | 213 g |
| 2 cups | 426 g |
For smaller amounts, one packed tablespoon is about 13 g.
How much brown sugar is in a box?
A standard US box or bag of brown sugar holds 1 pound, which is 454 g. At 213 g per packed cup, that is a little over 2 cups. Packaging often rounds this to about 2 1/4 cups; the exact figure depends on how firmly you pack. If a recipe needs more than 2 cups, check you have enough before you start, or weigh the sugar and stop at the number you need.
Keeping brown sugar soft
Brown sugar hardens as its moisture escapes, and a rock-hard lump is impossible to pack or measure. Store it in an airtight container. To soften a block, seal it in a container with a slice of bread or a damp paper towel overnight, or microwave it in short bursts under a damp towel. Weigh hardened sugar rather than measuring it: a chunk chipped into a cup leaves big gaps, so a cup of it is far less than 213 g.
The reliable way: weigh it
Put the bowl on a scale, press tare, and pour in brown sugar until you reach the number. Nothing needs packing, hard lumps do not matter, and the result is the same in every kitchen. If a recipe gives cups, convert it with the brown sugar chart, and see why baking by weight is worth it. The same logic applies to flour, where the problem is the opposite one: scooping packs it down. See how to measure flour.