How Many Grams of White Sugar Are in a Cup
If you don’t have a scale on hand, you can use spoons as a reference, although always with slightly less precision:
- 1 tablespoon = 12.5 g
- 1 teaspoon = 4.2 g
- 16 tablespoons = 1 cup (200 g)
This method works in a pinch, but for fine baking—where the sugar-fat-flour ratio directly affects the final structure—it’s always best to use exact grams.
When it makes sense to measure in ounces instead of grams
Many English-language recipes, especially older ones or those of British origin, list weight in ounces (oz) instead of grams. A cup of white sugar equals approximately 7.05 oz. If you come across a recipe mixing ounces and grams, or you simply prefer working with your scale in that format, you can use the grams-to-ounces calculator to avoid wasting time doing the math by hand every time.
Common mistakes when converting sugar from cups to grams
These are the most common mistakes I see repeated in baking recipes:
- Confusing the US cup (240 ml) with the metric cup (250 ml), which slightly changes the result.
- Using the same conversion for powdered sugar, which weighs much less per cup since it’s lighter and more aerated.
- Not leveling the cup and assuming the result is still 200 g.
- Mixing up volume and weight units without realizing it, for example writing ‘200 ml of sugar’ when the original recipe said grams.
Apply it to real recipes
If you’re converting a whole American recipe and not just the sugar, it’s worth reviewing the entire process step by step in how to convert an American recipe from cups to grams, which also covers other ingredients that typically appear alongside sugar, such as flour, butter, or eggs.
Frequently asked questions
How many grams of white sugar are in a cup?
A US cup of granulated white sugar, measured level, weighs 200 grams. This is the standard equivalence used in most English-language baking recipes.
How much does a cup of powdered sugar weigh?
Powdered sugar (icing sugar) weighs less than granulated sugar per cup, approximately 120 grams, because its fine particles trap more air and take up more volume with less mass.
Is a US cup the same as a metric cup?
Not exactly. The US cup equals 240 ml, while the metric cup used in some countries equals 250 ml. For sugar, that difference means about 8 grams more if you use the metric cup.
How many grams of sugar are in half a cup?
Half a cup of white sugar equals 100 grams, following the same proportion of 200 g per full cup.
Why does my recipe turn out differently if I measure sugar with a cup instead of a scale?
Because measuring by volume introduces variability: if you pack the sugar down while filling the cup or don’t level it, the actual weight can vary by up to 20-25 grams from the standard 200 g, affecting the final texture of the result.
A US cup of white sugar weighs 200 grams. That’s the figure used in most American baking recipes, and it’s what you need if your recipe is written in cups but your scale only understands grams. There’s no trick or approximation here: it’s the real weight of 240 ml of granulated white sugar, packed normally, not pressed down.
Grams of white sugar in a cup: the quick table
If you need partial measurements, here’s the sugar cup-to-grams conversion broken down so you don’t have to do mental math while your hands are covered in flour:
- 1 cup of white sugar = 200 g
- 3/4 cup = 150 g
- 2/3 cup = 133 g
- 1/2 cup = 100 g
- 1/3 cup = 67 g
- 1/4 cup = 50 g
- 1 tablespoon of white sugar = 12.5 g
This table solves 90% of the doubts when converting a recipe that uses cups into a gram-based format, which is what you need to weigh precisely on a kitchen scale.
Why a cup of sugar weighs differently than a cup of flour
A cup is a unit of volume (240 ml), not weight. What changes the final result in grams is the density of the ingredient you put inside. Granulated white sugar has small, uniform crystals that pack together fairly predictably, which is why its weight per cup is more stable than other ingredients like flour, which traps much more air.
If you’re curious to compare, you can check how many grams of flour are in a cup and you’ll see the number drops quite a bit compared to sugar, even though the volume is identical.
How much a cup of sugar weighs depending on how you measure it
White sugar is one of the most consistent ingredients to measure, but there’s still room for error if you don’t follow a method:
- Level cup: fill the cup and run the back of a knife across the top to remove the excess. This is the standard method and the one that gives 200 g.
- Heaped cup: without leveling, this can add between 15 and 25 g extra, throwing off the recipe.
- Sugar packed with a spoon: pressing the sugar into the cup can add up to 20 g more than expected.
For baking, especially meringues, sponge cakes, or macarons, that 20-25 g difference can be noticeable in the final texture. So if your scale allows it, it’s always better to weigh in grams than to rely on volume.
White sugar vs. brown sugar: they don’t weigh the same
A common mistake is assuming all sugars weigh the same per cup. That’s not the case. Brown sugar contains molasses, which makes its crystals clump together and take up less air space, giving it a higher weight per cup. If your recipe calls for brown sugar, check how many grams of brown sugar are in a cup before swapping one for the other blindly.
How to weigh white sugar without a scale (approximate method)
If you don’t have a scale on hand, you can use spoons as a reference, although always with slightly less precision:
- 1 tablespoon = 12.5 g
- 1 teaspoon = 4.2 g
- 16 tablespoons = 1 cup (200 g)
This method works in a pinch, but for fine baking—where the sugar-fat-flour ratio directly affects the final structure—it’s always best to use exact grams.
When it makes sense to measure in ounces instead of grams
Many English-language recipes, especially older ones or those of British origin, list weight in ounces (oz) instead of grams. A cup of white sugar equals approximately 7.05 oz. If you come across a recipe mixing ounces and grams, or you simply prefer working with your scale in that format, you can use the grams-to-ounces calculator to avoid wasting time doing the math by hand every time.
Common mistakes when converting sugar from cups to grams
These are the most common mistakes I see repeated in baking recipes:
- Confusing the US cup (240 ml) with the metric cup (250 ml), which slightly changes the result.
- Using the same conversion for powdered sugar, which weighs much less per cup since it’s lighter and more aerated.
- Not leveling the cup and assuming the result is still 200 g.
- Mixing up volume and weight units without realizing it, for example writing ‘200 ml of sugar’ when the original recipe said grams.
Apply it to real recipes
If you’re converting a whole American recipe and not just the sugar, it’s worth reviewing the entire process step by step in how to convert an American recipe from cups to grams, which also covers other ingredients that typically appear alongside sugar, such as flour, butter, or eggs.
Frequently asked questions
How many grams of white sugar are in a cup?
A US cup of granulated white sugar, measured level, weighs 200 grams. This is the standard equivalence used in most English-language baking recipes.
How much does a cup of powdered sugar weigh?
Powdered sugar (icing sugar) weighs less than granulated sugar per cup, approximately 120 grams, because its fine particles trap more air and take up more volume with less mass.
Is a US cup the same as a metric cup?
Not exactly. The US cup equals 240 ml, while the metric cup used in some countries equals 250 ml. For sugar, that difference means about 8 grams more if you use the metric cup.
How many grams of sugar are in half a cup?
Half a cup of white sugar equals 100 grams, following the same proportion of 200 g per full cup.
Why does my recipe turn out differently if I measure sugar with a cup instead of a scale?
Because measuring by volume introduces variability: if you pack the sugar down while filling the cup or don’t level it, the actual weight can vary by up to 20-25 grams from the standard 200 g, affecting the final texture of the result.