Cups to Grams Calculator

A cup is a volume, but grams are a weight, and the bridge between them depends entirely on the ingredient. This cups to grams calculator uses trusted per-ingredient weights so a cup of flour and a cup of honey convert correctly, not with one generic number.

How the cups to grams calculator works

Every ingredient has a density, so the same cup holds a different weight depending on what fills it. The cups to grams calculator stores a grams-per-cup value for each common ingredient and simply multiplies it by the number of cups you enter. One cup of all-purpose flour is about 120 grams, while one cup of granulated sugar is about 200 grams and a cup of honey is roughly 340 grams.

Choose your ingredient, type the number of cups, and the tool returns both grams and ounces. Because it never assumes one blanket conversion, it stays accurate across flours, sugars, fats, and liquids. The reference weights match the widely used King Arthur ingredient weight chart.

A worked example

A recipe calls for 2 cups of all-purpose flour and you want to weigh it for accuracy. Select flour, enter 2 cups, and the calculator shows 240 grams, or about 8.5 ounces. Weighing to that number removes the biggest source of error in baking, which is packing too much flour into the cup.

Now switch the ingredient to butter and keep 2 cups. The result jumps to 454 grams, because butter is far denser than flour. That difference is exactly why a single generic cup-to-gram number fails and why choosing the ingredient matters so much.

Getting the most accurate result

Flour is the ingredient most sensitive to measuring technique. Scooping straight from the bag compacts it and can add 20 percent more weight than the spoon-and-level method, so if you must use cups, spoon the flour in lightly and sweep it level. Weighing sidesteps the problem entirely, which is why professional bakers and the King Arthur Baking success guide push scales so hard.

To go the other direction, use our grams to cups calculator, and for scaling a whole recipe up or down first, the recipe scaler calculator handles the ratios. All of the kitchen conversion tools live together on the kitchen calculators hub.

Frequently asked questions

How many grams are in one cup?

It depends on the ingredient. One cup of all-purpose flour is about 120 grams, granulated sugar is about 200 grams, butter is about 227 grams, and honey is about 340 grams. The cups to grams calculator applies the right weight for each.

Why does the answer change when I switch ingredients?

Because grams measure weight and cups measure volume. Denser ingredients weigh more per cup, so the conversion has to be specific to each one rather than a single fixed number.

Is a cup of flour really 120 grams?

That is the King Arthur Baking standard for all-purpose flour measured by spooning and leveling. Scooping directly from the bag can push a cup to 140 grams or more, which is why weighing is more reliable.

Does US cup and metric cup give different grams?

Slightly. This calculator uses the US customary cup (about 236 millilitres). A metric cup is 250 millilitres, so it holds a little more, but for most home recipes the difference is small.

Can I convert liquids with this tool?

Yes. Water and milk are included, and both sit near 227 to 236 grams per cup because their density is close to water. For thicker liquids like honey, the calculator uses their higher specific weight.