100 grams of sugar in cups
Granulated sugar is one of the few ingredients a cup measure gets right. 100 grams comes to about 0.51 of a US cup, near enough a clean half, and 200 g fills a whole cup. Flour never lines up this neatly.
The clean half cup
A US cup of granulated sugar weighs 198 g, close to 200, so the grams and the cup marks fall almost together. 100 g sits on the half, 200 g on the full cup. A level half cup weighs 99 g, a gram under your 100. Sugar is the rare ingredient where reading grams off the cup lines barely costs you a thing.
| Sugar | US cups |
|---|---|
| 100 g | 0.51 cups |
| 200 g | 1 cups |
Why sugar reverses when flour will not
Two things line up. A cup of sugar is 198 g, heavier than flour's, so its weights sit near the round 100 and 200 the cups are marked in. Sugar crystals also hold their shape; they do not pack down under a spoon the way flour does, so the half-cup line means 99 g whether you pour it gently or firmly. Flour's 100 g lands on 0.83 of a cup, an unpourable five-sixths that shifts with every scoop. Same weight, opposite luck.
The sugar master page carries the full cup chart and the note on why sugar's charts nearly agree.
Other sugar weights in cups
The same reading for the weights a recipe tends to name:
| Sugar | US cups |
|---|---|
| 50 g | 0.25 cups |
| 100 g | 0.51 cups |
| 150 g | 0.76 cups |
| 200 g | 1 cups |
| 250 g | 1.3 cups |
Not every ingredient reverses this cleanly. The same 100 grams is an unpourable five-sixths for flour and most of a stick for butter. Double it and 200 grams of sugar lands on a full US cup.
Sugar by weight, common questions
- Is 100 grams of sugar half a cup?
- Close to it. 100 g of granulated sugar is about 0.51 of a US cup, and a level half cup weighs 99 g, so the two sit within a gram or two.
- How many cups is 200 grams of sugar?
- About 1 of a US cup, near enough a full one. A cup of granulated sugar is 198 g, so 200 g rounds clean where flour or oats would not.
- Does 100 grams of every ingredient equal half a cup?
- No, only the dense ones that hold their shape. Sugar does, at 0.51 of a cup. Flour's 100 g is 0.83, and light flakes run higher still, because a cup of them weighs far less.
Sources
King Arthur Baking for the 198 gram cup and USDA FoodData Central SR Legacy for the 200 gram cup, two grams apart. The full chart and the low-compression note are on the sugar master. Full citations on the sources page.