A 2 lb bag of brown sugar holds about 4.3 cups — but only if you pack it. Brown sugar is measured packed, not spooned: you press it firmly into the cup measure until it holds its shape when you turn it out, like a little sandcastle. Packed, a cup of brown sugar weighs 213 g, and 907 divided by 213 is 4.3 cups. Loosely spooned, a cup weighs only about 170 g, which would give you 5.3 cups from the same bag — a whole cup more. The difference is the packing, and it is the largest packing effect of any common ingredient, which is why brown sugar is the one ingredient where the measuring method truly matters.
Four point three cups is about four batches of chocolate chip cookies at 1 cup each, or eight batches at half a cup each, or two sticky toffee puddings at 2 cups each. Brown sugar is granulated sugar with molasses added back, which gives it a moist texture, a caramel flavour and a tendency to clump. It is sold in 2 lb bags because most bakers use it in smaller amounts than white sugar, often mixed with white sugar rather than used alone. Knowing the bag holds 4.3 cups — packed — lets you plan: if a recipe uses 1 cup, a bag covers four batches, and you will know when it is time to buy another bag.
Bag of brown sugar conversion table
The table below shows how many cups you get from fractions of a 2 lb bag, and how many cups of brown sugar weigh how many grams. All figures use 213 g per cup, packed firmly.
| Amount | Cups (approx.) | Weight |
|---|---|---|
| 1/4 bag | 1.07 cups (about 1 1/8 cups) | 227 g |
| 1/2 bag | 2.15 cups (about 2 1/8 cups) | 454 g |
| 3/4 bag | 3.22 cups (about 3 1/4 cups) | 680 g |
| Full bag | 4.30 cups (about 4 1/4 cups) | 907 g |
| Cups | Grams (approx.) |
|---|---|
| 1 cup | 213 g |
| 2 cups | 426 g |
| 3 cups | 639 g |
| 4 cups | 852 g |
| 5 cups | 1,065 g |
| 10 cups | 2,130 g |
Brown sugar must be measured packed. Loosely spooned, a cup weighs about 170 g, which would give 5.3 cups per bag — a whole cup more. Pack it firmly into the cup and level it off.
Worked examples
Chocolate chip cookies for a bake sale
A batch of chocolate chip cookies uses 1 cup of brown sugar — packed — mixed with 1/2 cup of white sugar, butter, eggs, flour and chocolate chips. One 2 lb bag holds 4.3 cups packed, so it covers four batches — 96 cookies. The brown sugar gives the cookies their chewy texture and caramel flavour, and it helps them stay moist. Pack the sugar firmly into the cup: press it down with the back of a spoon until it holds its shape. If you spoon it in loosely, you will use too little sugar and the cookies will be dry and crisp instead of chewy.
Sticky toffee pudding for eight
A sticky toffee pudding for eight people uses 2 cups of brown sugar — packed — in the sponge and the toffee sauce combined. One 2 lb bag holds 4.3 cups, so it covers two puddings with a little left over. The brown sugar gives the pudding its deep caramel flavour and its moist, sticky texture. Measure the sugar packed for both the sponge and the sauce, because the recipe depends on the full amount: too little sugar and the sauce will be thin and the sponge will be dry. Serve the pudding warm with custard or ice cream.
A barbecue rub for a summer of grilling
A barbecue rub uses 1/2 cup of brown sugar — packed — mixed with paprika, salt, pepper, garlic powder and cumin. One 2 lb bag holds 4.3 cups, so it covers eight batches of rub — a whole summer of grilling. The brown sugar caramelises on the meat and gives it a sweet, smoky crust. Pack the sugar firmly into the cup, because a loosely measured half cup is noticeably less sugar, and the rub will be less sweet and less caramelised. Store the rub in an airtight jar, and use it within a month.
How the figure is worked out
Think of the answer as a conversion, not a measurement. The package weight is a standard 2 lb (907 g) bag of brown sugar, packed. One cup of this ingredient weighs a known number of grams, so the cups in the package are the package weight divided by the cup weight. The method matters as much as the number: a spooned and levelled cup is the standard, and a scooped cup packs in more, which is why two bakers can get different cup counts from the same bag. The cup weight used here is 213 g per cup, packed, sourced from King Arthur Baking. Packed firmly, per King Arthur; loosely spooned brown sugar weighs about 170 g per cup, so packing matters more than for any other sugar.
Practical guidance
Brown sugar dries out and hardens into a brick, and that is the most common problem with it. The molasses that gives brown sugar its flavour also makes it moist, and when that moisture evaporates, the sugar hardens. Store brown sugar in an airtight container, and put a piece of bread or a terracotta sugar saver in the container — the bread gives up its moisture to the sugar and keeps it soft. If your brown sugar has already hardened, put it in a bowl with a damp paper towel, cover it with cling film, and microwave it for twenty seconds — the steam will soften it. Or put a slice of bread in the bag overnight, and the sugar will be soft by morning.
Measure brown sugar packed, always. Press it firmly into the cup measure with the back of a spoon, level it off, and turn it out — it should hold its shape like a little sandcastle. If it falls apart, it was not packed firmly enough. The difference between packed and loose is 43 g per cup — 213 g packed versus about 170 g loose — which is a fifth of the sugar in the recipe. In a cookie recipe, that is the difference between chewy and crisp. Weighing is even better: 1 cup packed is 213 g, every time, and weighing removes the packing variable entirely. And remember that light brown sugar and dark brown sugar weigh the same per cup — the difference is the amount of molasses, not the weight — so the 4.3 cup figure holds for both.
Frequently asked questions
How do I measure brown sugar — packed or loose?
Packed, always. Press the brown sugar firmly into the cup measure until it holds its shape when turned out. Packed, a cup weighs 213 g; loosely spooned, it weighs about 170 g — a difference of 43 g per cup, which is a fifth of the sugar in the recipe. Weighing is even better: 1 cup packed is 213 g.
How many cups are in a 5 lb bag of brown sugar?
About 10.7 cups packed. A 5 lb bag is 2,268 g, and at 213 g per cup that divides out to 10.65 cups. That is about ten batches of cookies at 1 cup each, or five sticky toffee puddings at 2 cups each. Loosely measured, the same bag would give about 13.3 cups — which is why packing matters.
What is the difference between light and dark brown sugar?
The amount of molasses. Light brown sugar has less molasses and a milder flavour; dark brown sugar has more molasses and a stronger, more caramel flavour. They weigh the same per cup — 213 g packed — so they swap measure for measure. Use dark brown sugar when you want a deeper flavour, and light brown sugar when you want a gentler one.
How do I soften hard brown sugar?
Put it in a bowl with a damp paper towel, cover it with cling film, and microwave it for twenty seconds. Or put a slice of bread in the bag overnight — the bread gives up its moisture to the sugar and softens it by morning. To prevent hardening, store brown sugar in an airtight container with a piece of bread or a terracotta sugar saver.
How long does brown sugar keep?
Indefinitely, if it is kept soft and dry — sugar does not go off. But brown sugar hardens as it dries out, and once it is rock hard it is difficult to use. Store it in an airtight container with a piece of bread or a terracotta saver, and it will stay soft for months.