What this calculator does
Converting grams to cups only works once you know what you are weighing, because a cup of flour and a cup of honey do not weigh the same amount. This calculator holds a typical density for each common baking ingredient and uses it to turn a weight in grams into the equivalent volume in cups.
The thing people get wrong is treating "cup" as a fixed weight the way a litre or a kilogram is fixed. A cup is a volume, and how much a cup of a given ingredient weighs depends on how densely it packs: sifted flour sits lighter in the cup than scooped and levelled flour, which is why weighing on a kitchen scale is more reliable than measuring by cup for anything where the ratio matters, like baking.
The formula
Divide the weight in grams by the number of grams a level cup of the chosen ingredient typically weighs. The result is the equivalent volume in cups, using standard reference densities for each ingredient.
| Term | Meaning |
|---|---|
| Grams per cup | How much a level, packed cup of the chosen ingredient typically weighs. |
| Cup | A volume measure (240 ml in the US), not a fixed weight, so its weight changes with what is inside it. |
| Volume | The converted amount, in cups, tablespoons and fluid ounces. |
The inputs explained
| Field | What to enter |
|---|---|
| Weight (g) | The weight in grams you want converted to cups. |
| Ingredient | The ingredient being measured. Density varies a lot between ingredients, so this changes the result. |
When to use it
Converting a recipe given in grams
Recipes from outside the US, or from bakers who weigh their ingredients, often list weights in grams. This converts those weights back to cup measures for a US-style recipe or a kitchen without scales.
Checking a specific weight you keep looking up
Searches for a specific figure, such as how many cups is 100 grams or 250 grams, are common because the same few weights come up in recipes again and again. The table below covers the most common ones directly.
Comparing ingredients at the same weight
The same 100 grams is under half a cup of sugar but well over a cup of rolled oats, since oats are far less dense; seeing several ingredients side by side at one weight shows how much that density difference matters.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How many cups is a given weight of flour?
A range of common flour weights converted to cups.
How many cups is 100 g of different ingredients?
The same 100 g weight, converted using the density of each ingredient.
Questions
How many cups is 100 grams of flour?
About 0.83 cups, using the common reference of 120 g per level cup of all-purpose flour. Because a cup is a volume, this figure shifts slightly depending on whether the flour is sifted, scooped or spooned into the cup.
How many cups is 250 grams to cups for sugar?
About 1.25 cups of granulated sugar, taking a level cup of sugar as 200 g. Brown sugar, packed, weighs more per cup, so the same 250 g comes to a smaller volume.
Why is 100 grams in cups different for every ingredient?
A cup measures volume, not weight, so the same 100 g fills different amounts of a cup depending on how densely the ingredient packs. Honey and butter are dense and take up little volume for their weight; oats are light and airy and take up a lot.
Is weighing more accurate than measuring by cup?
Yes, for anything where the ratio of ingredients matters, such as baking. Cup measures depend on how the ingredient was packed into the cup, which varies from person to person, while a gram on a scale is the same everywhere.
For the reverse conversion, cups to grams for the same set of ingredients, see the cups to grams calculator.