A half cup of granulated sugar weighs about 100 grams, so it adds about 100 grams of sugar to a recipe.
If a recipe lists 1/2 cup sugar and you want the weight in grams, the number most home cooks need is 100 grams. That figure fits standard U.S. measuring cups and plain granulated white sugar. It’s the number that shows up in baking charts again and again because one full cup lands right around 200 grams.
That sounds almost too neat, but it tracks with how table sugar behaves in the kitchen. Granulated sugar is close to pure sucrose, so its weight and its sugar content are nearly the same. Measure out half a cup, and you’re looking at about 100 grams on the scale and about 100 grams of sugar going into the bowl.
There’s one catch. “1/2 cup sugar” does not always mean the same thing across every recipe. Cup size, sugar type, and the way you fill the cup can nudge the count up or down. That’s why a rounded answer is handy, but the details still matter when you bake often, track sugar intake, or scale a recipe for a bigger batch.
Half Cup Sugar In Grams For Everyday Kitchen Math
In most recipes, “sugar” means granulated white sugar unless another type is named. With that default, 1/2 cup is about 100 grams. You can treat that as your working number for cakes, cookies, muffins, syrups, and sweet sauces.
Using grams instead of cups helps in two ways. First, your recipe stays steadier from batch to batch. Second, the math gets easier when you halve or double ingredients. If 1/2 cup is 100 grams, then 1/4 cup is 50 grams, 1 cup is about 200 grams, and 2 cups land near 400 grams.
Why The Scoop Still Matters
Sugar is less fussy than flour, yet the filling method still changes the count a bit. A lightly filled cup and a packed cup do not weigh the same. Small swings rarely ruin a pan of brownies, but they can change spread, browning, and texture in cookies or candy work.
- Spoon-and-level gives a steadier result than digging the cup straight into the bag.
- A digital scale trims out guesswork when a recipe is sugar-heavy.
- Brown sugar, powdered sugar, and caster sugar do not match granulated sugar gram for gram by volume.
That last point trips people up all the time. A half cup of packed brown sugar weighs more than a half cup of granulated sugar. A half cup of powdered sugar weighs much less. Same cup measure, different weight.
When The 100-Gram Rule Shifts
The 100-gram rule works best for a U.S. half cup of granulated sugar. Shift the setup and the answer can move. Recipes from the U.K., Australia, and parts of Europe may use a metric cup instead of a U.S. cup. A metric cup is 250 milliliters, while a U.S. cup is about 237 milliliters. That gap sounds small, yet it changes the number enough to matter in tight baking formulas.
Sugar type matters too. Light brown sugar and dark brown sugar hold moisture from molasses, so they weigh more when packed. Powdered sugar is airy. Superfine sugar falls somewhere else again. If the recipe writer names a sugar type, match that type on the scale instead of leaning on the 100-gram shortcut.
The same logic applies to nutrition labels. If you are trying to estimate sugar intake from a recipe, the safest path is to weigh the sugar you add, then divide by the number of servings. Cup measures are handy. Gram weights are cleaner.
Common Sugar Measures At A Glance
This chart gives the plain granulated sugar numbers most cooks reach for. These are rounded kitchen figures, not lab figures, so they’re easy to use while you cook.
| Measure | Approximate Weight | Sugar Added |
|---|---|---|
| 1 teaspoon | 4 grams | 4 grams |
| 1 tablespoon | 12.5 grams | 12.5 grams |
| 1/8 cup | 25 grams | 25 grams |
| 1/4 cup | 50 grams | 50 grams |
| 1/3 cup | 67 grams | 67 grams |
| 1/2 cup | 100 grams | 100 grams |
| 3/4 cup | 150 grams | 150 grams |
| 1 cup | 200 grams | 200 grams |
If you want a hard reference for the kitchen side of this, King Arthur’s ingredient weight chart lists one cup of granulated sugar at 198 grams. That puts a half cup at 99 grams, which is why cooks round it to 100 grams without much trouble.
What That Means For Sugar Intake
A half cup of table sugar is not a small amount. Since granulated sugar is nearly all sugar, half a cup can blow past what many labels treat as a full day’s added sugar target. The FDA’s added sugars Daily Value is 50 grams on a 2,000-calorie diet. Put next to that marker, 1/2 cup of granulated sugar lands at about double the daily figure.
That does not mean every recipe with half a cup of sugar is out of bounds. A cake or sauce gets split into servings, and the sugar per serving may drop a lot. Still, seeing the full bowl number in grams helps you judge a recipe with open eyes. The CDC’s added sugars facts page also notes that many people get more added sugar than they think, mainly from drinks, desserts, snacks, and sweet baked foods.
If you’re cooking for one person, a half cup might stretch across days. If you’re mixing a pitcher of sweet tea, that same amount may vanish into just a few glasses. Context changes the nutrition story fast.
| Amount Of Granulated Sugar | Grams | Share Of FDA Daily Value |
|---|---|---|
| 1 tablespoon | 12.5 grams | 25% |
| 1/4 cup | 50 grams | 100% |
| 1/2 cup | 100 grams | 200% |
| 3/4 cup | 150 grams | 300% |
| 1 cup | 200 grams | 400% |
Where People Get Thrown Off
A lot of confusion starts with one small missing detail: what kind of sugar is in the cup. If a recipe says “packed” or “sifted,” the cup weight changes right away. If it comes from an older cookbook, the writer may also be using a different measuring style than a newer baking site.
Watch These Three Trouble Spots
- Different cup systems: A U.S. cup and a metric cup are not twins.
- Different sugar textures: Powdered sugar is fluffy, brown sugar is dense when packed, and superfine sugar settles differently.
- Different goals: Recipe conversion, nutrition tracking, and candy making each need a different level of precision.
If your main goal is recipe success, rounding 1/2 cup granulated sugar to 100 grams works well. If your main goal is sugar counting, weigh the ingredient and divide by servings. If your main goal is candy or syrup work, use the scale from the start and follow the recipe’s exact sugar type.
Practical Ways To Use The Number
Once you know the half-cup figure, the rest gets easier. Need to cut a recipe by half? Swap 1/2 cup sugar for 100 grams, then divide from there. Need 3/8 cup? Split the difference between 1/4 cup and 1/2 cup and you land near 75 grams.
That same number helps when you read nutrition claims online. If someone says a drink recipe uses “just half a cup of sugar,” you can translate that at once: about 100 grams in the pitcher. Then you can judge the sugar per glass instead of getting lulled by the cup measure.
A Simple Kitchen Habit That Pays Off
Keep one cheap digital scale near the mixing bowl. Set the bowl on the scale, tare it to zero, and pour the sugar in until you hit the gram target. It’s cleaner than filling cups, faster once you get used to it, and much easier when you scale recipes up or down.
So, how many grams of sugar are in 1/2 cup? For plain granulated sugar in a standard U.S. cup, the working answer is 100 grams. That’s the number to reach for unless the recipe names a different sugar or a different cup system.
References & Sources
- King Arthur Baking.“Ingredient Weight Chart.”Provides a baking weight chart that lists one cup of granulated sugar at 198 grams, which backs the half-cup figure used in the article.
- U.S. Food and Drug Administration.“Added Sugars on the Nutrition Facts Label.”States that the Daily Value for added sugars is 50 grams on a 2,000-calorie diet.
- Centers for Disease Control and Prevention.“Get the Facts: Added Sugars.”Summarizes added sugar intake patterns and notes links between excess added sugar intake and health problems.
