Cups to Grams
This cups to grams converter handles the fact that a cup of flour and a cup of sugar weigh different amounts. Pick your ingredient, type the cups, and you'll get the grams and ounces, or flip it to go from grams back to cups. It covers the common baking ingredients with their real densities, so your measurements line up with a kitchen scale. It's free, you won't need an account, and it runs on any device, so following any recipe is easy. You'll see the result the moment you type.
- Cups to grams
- Grams to cups
- By ingredient
- Grams and ounces
- Real densities
Last updated July 24, 2026 US cups, by ingredient Reviewed by the Calcowa team
Based on the US cup of about 237 ml. Densities are typical baking averages, since how you scoop and pack changes the exact weight.
1 cup to grams, at a glance
One US cup weighs a different number of grams for each ingredient, because a cup measures volume and grams measure weight. For the three most common baking ingredients, 1 cup is about 120 g of all-purpose flour, 200 g of granulated sugar, and 227 g of butter. Choose your ingredient above for the exact figure, or scan the amount tables below for half, third, and quarter cups.
Why does cups to grams depend on the ingredient?
A cup measures volume, the space something fills, while a gram measures weight, so converting between them needs to know how heavy that ingredient is per cup. Light, airy things like flour pack loosely, so a cup is about 120 grams, while dense ones like sugar settle tightly at around 200 grams, and a liquid like honey is heavier still near 340 grams. To convert cups to grams you multiply the cups by that per-cup weight, and to go the other way you divide the grams by it. This tool stores the typical density for each common baking ingredient, so you pick the food, type the amount, and it handles the math in both directions, showing grams and ounces so it fits whatever your scale or recipe uses. You don't have to look up a density chart, and you won't mix up flour with sugar, since each ingredient carries its own number. That's the part that's easy to get wrong when you're converting a recipe by hand. For a deeper walk-through with photos and per-ingredient notes, see our cups to grams baking guide, or flip the whole thing around in the grams to cups guide.
Converting a measurement, step by step
Here's the quick routine for any recipe, and it's just four steps:
- 1
Pick a directionCups to grams, or grams to cups.
- 2
Choose the ingredientFlour, sugar, butter, and the rest are in the list.
- 3
Type the amountEnter your cups or grams, and it converts live.
- 4
Read grams and ouncesYou'll get both, so it fits any scale.
Grams in one cup by ingredient
Typical weight of one US cup of each common baking ingredient.
| Ingredient | 1 cup | In ounces |
|---|---|---|
| All-purpose flour | 120 g | 4.2 oz |
| Bread flour | 127 g | 4.5 oz |
| Granulated sugar | 200 g | 7.1 oz |
| Brown sugar (packed) | 220 g | 7.8 oz |
| Powdered sugar | 120 g | 4.2 oz |
| Butter | 227 g | 8.0 oz |
| Milk | 240 g | 8.5 oz |
| Water | 237 g | 8.4 oz |
| Vegetable oil | 218 g | 7.7 oz |
Common cup amounts to grams
Recipes rarely call for a flat cup, so here's a quarter, third, half, two-thirds, three-quarter, and full US cup for the three most-used baking ingredients. Grams are rounded to the nearest whole, and every figure comes straight from the same per-cup densities the converter uses.
| Amount | All-purpose flour | Granulated sugar | Butter |
|---|---|---|---|
| 1/4 cup | 30 g | 50 g | 57 g |
| 1/3 cup | 40 g | 67 g | 76 g |
| 1/2 cup | 60 g | 100 g | 114 g |
| 2/3 cup | 80 g | 133 g | 151 g |
| 3/4 cup | 90 g | 150 g | 170 g |
| 1 cup | 120 g | 200 g | 227 g |
Need a different ingredient or amount, like 1.5 cups or a metric cup? Type it into the converter at the top.
Frequently asked questions
You multiply the number of cups by how many grams that ingredient weighs in one cup, because a cup is a measure of volume, not weight. A cup of all-purpose flour is about 120 grams, while a cup of granulated sugar is about 200 grams, so the same cup gives a different weight for each. Pick your ingredient from the list, type the amount, and the tool does the multiplication and shows grams and ounces, both ways.
Because cups measure space and grams measure weight, and ingredients pack differently. Flour is light and fluffy, so a cup holds about 120 grams, while sugar is dense and pours tight, so a cup is closer to 200 grams. Honey is heavier still at around 340 grams a cup. That's exactly why baking recipes that care about accuracy give weights, and it's why a single cups-to-grams number won't work for everything, so you'll want to pick the ingredient.
Not quite. A US cup is about 237 milliliters, while a metric cup used in much of the world is 250 milliliters, so a metric cup holds a little more. The figures here use the US cup, which is what most American recipes mean. The difference is small for a single cup but adds up across a big batch, so it's worth knowing which cup your recipe was written in, and you'll be glad you checked on a large bake.
About 227 grams, which is the same as 8 ounces or two US sticks, so a stick of butter is roughly 113 grams. Recipes often give butter in sticks or tablespoons, and this converter lets you go from cups to grams quickly when a recipe is written one way and your scale reads the other. Half a cup is about 113 grams, and a quarter cup is about 57 grams.
Weighing is more accurate, because the way you scoop and pack a cup changes how much you get, especially with flour. Spooning flour in lightly versus scooping straight from the bag can swing the weight by 20 percent, which is enough to throw off a bake. A kitchen scale removes that guesswork, so if a recipe matters, weigh it in grams using the figures here as your guide.
It depends on the ingredient, since half a cup is just half of that ingredient's per-cup weight. Half a cup of all-purpose flour is about 60 grams, half a cup of granulated sugar is about 100 grams, and half a cup of butter is about 113 grams, which is one US stick. For a third of a cup, take a third of the full-cup figure, so a third of a cup of flour is about 40 grams. The amount table above lists quarter, third, half, and three-quarter cups side by side.
Yes, it's completely free, with no sign-up, and it runs right in your browser, so your numbers never leave the page. Switch between cups to grams and grams to cups, pick from common baking ingredients, and read grams and ounces in a tap. Bookmark it for following recipes across regions, scaling a batch, or working with a kitchen scale, and you'll have the conversion ready whenever you cook.
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