Cups of Brown Sugar to Grams Conversion
1 cup packed brown sugar = 220g
Brown sugar gets its color and moisture from molasses mixed with white sugar. Light brown has about 3.5% molasses. Dark brown has 6.5%.
This moisture makes brown sugar clump together, which is why recipes specify "packed" measurements. 1 cup packed brown sugar weighs 220 grams. The same cup holds only 195 grams if you pour it in loosely. That 25-gram difference changes texture in cookies and moisture in cakes.
Professional bakers weigh brown sugar because packing consistency varies between cooks. One person's "firmly packed" might be another's "lightly pressed." A scale removes the guesswork.
How to Convert
For packed brown sugar: multiply cups by 220. For unpacked: multiply cups by 195.
To pack brown sugar properly, spoon it into the measuring cup. Press down firmly with your fingers or the back of a spoon. Add more sugar. Press again. Continue until the cup is full and the sugar holds its shape when turned out.
Example: A cookie recipe needs 1.5 cups packed brown sugar. Calculate 1.5 x 220 = 330 grams. Place your mixing bowl on the scale. Tare to zero. Add brown sugar until the scale reads 330g.
For fractional cups: - 1/4 cup packed = 55g - 1/3 cup packed = 73g - 1/2 cup packed = 110g - 3/4 cup packed = 165g
Common Mistakes
Using the white sugar conversion (200g per cup) for brown sugar. Brown sugar is denser when packed. The extra 20 grams per cup affects sweetness and moisture.
Measuring brown sugar in a liquid measuring cup. The wide mouth and angled sides make consistent packing impossible. Use dry measuring cups with straight sides.
Not specifying packed vs unpacked in recipes. If a recipe just says "brown sugar" without clarification, assume packed. Most baking recipes mean packed unless they specifically say "loosely packed" or "unpacked."
Substituting dark for light brown sugar by weight alone. Dark brown has more molasses, which adds moisture. In delicate cakes, this extra moisture can make the texture dense. Cookies handle the swap better.
Pro Tips
Store brown sugar with a terra cotta disk or slice of bread to prevent hardening. The sugar absorbs moisture and stays soft. Replace the bread every 2-3 days.
To soften hard brown sugar quickly, microwave it with a damp paper towel for 20-30 seconds. Check every 10 seconds. The sugar softens as the moisture redistributes.
Make your own brown sugar: mix 1 cup white sugar (200g) with 1 tablespoon molasses for light brown or 2 tablespoons for dark. Blend thoroughly. This weighs slightly less than commercial brown sugar because you're starting with less dense white sugar.
Freeze brown sugar in recipe-sized portions. It doesn't freeze solid. You can scoop directly from the freezer bag. No thawing needed.
Ingredient-Specific Notes
Light brown sugar
220g per packed cup, 195g unpacked. Contains 3.5% molasses by weight. Most common type in American baking. Gives cookies a mild caramel flavor without overpowering other ingredients.
Dark brown sugar
220g per packed cup, 195g unpacked. Contains 6.5% molasses. The extra molasses adds deeper flavor and more moisture. Makes chewier cookies and moister cakes. Some gingerbread recipes specifically call for dark.
Muscovado sugar
200g per packed cup. Unrefined cane sugar with natural molasses. Stickier than regular brown sugar. Strong toffee flavor. Common in British recipes. Light muscovado substitutes 1:1 for light brown sugar by weight.
Turbinado sugar
200g per cup. Large crystals don't pack the same way. Often called "raw sugar." Less moisture than brown sugar. Won't give the same texture in cookies. Better as a crunchy topping.
Coconut sugar
190g per cup. Granulated, doesn't pack like brown sugar. Lower moisture content. Substitutes better for white sugar than brown in most recipes. Has a slight caramel flavor.
Frequently Asked Questions
Why do recipes say "packed" brown sugar?
Brown sugar contains molasses, making it moist and clumpy. Without packing, air gaps between clumps create inconsistent measurements. 1 cup can hold anywhere from 195g (loose) to 220g (packed). Most recipes assume packed because that's how brown sugar was traditionally sold in blocks before modern processing. Packing gives consistent results. Think of it like measuring flour in reverse: flour needs gentle handling to avoid compression, while brown sugar needs firm packing to eliminate air pockets.
Can I substitute white sugar for brown sugar by weight?
Not directly. 220g brown sugar contains about 213g sugar and 7g molasses (for light brown). Substituting 220g white sugar makes recipes sweeter and drier. For each cup of brown sugar, use 200g white sugar plus 1 tablespoon molasses for light brown or 2 tablespoons for dark. Mix thoroughly. This recreates both the sweetness level and moisture content. In cookies, the moisture difference affects spread and chewiness. In cakes, it changes crumb texture.
How do I measure brown sugar without a scale?
Use dry measuring cups with straight sides. Spoon brown sugar into the cup. Press firmly with your fingers or spoon back, adding more sugar as it compresses. Level with a straight edge. The packed sugar should hold the cup shape when turned out. For 1/2 cup or less, pack with your thumb. For larger amounts, use the heel of your hand. The goal is 220g per cup, so pack firmly enough that the sugar feels dense, not fluffy.
Does brown sugar expire or go bad?
Brown sugar lasts indefinitely if stored properly. It hardens when moisture evaporates but remains safe to eat. Hard sugar just needs moisture added back. Store in an airtight container with a brown sugar saver disk or apple slice. If it hardens, microwave with a damp towel for 20 seconds or seal overnight in a bag with fresh bread. The sugar absorbs moisture and softens. Properly stored brown sugar keeps its flavor for 2 years, though it's safe much longer.
Is there a difference between 1 cup sugar, packed and 1 packed cup sugar?
No difference. Both mean the same thing: pack the sugar firmly into a 1-cup measure. Recipe writers use both phrases interchangeably. The key word is "packed," which tells you to compress the sugar to 220g per cup. Without "packed," you'd get only 195g. Some recipes specify "firmly packed" or "lightly packed" for different densities, but most simply say "packed" and mean the standard 220g firm pack.