⚖️ Grams to Cups Converter
Pick an ingredient and convert between cups, tablespoons, grams and ounces — using the correct weight for that ingredient, not a one-size-fits-all number.
Weight
120 g
4.23 oz
Volume
237 mL
Flour, all-purpose: 120 g per US cup Weights from King Arthur Baking's Ingredient Weight Chart. 🔒 In your browser.
How the grams to cups converter works
A cup is a measure of volume, but grams measure weight, so the conversion depends entirely on the ingredient: a US cup of all-purpose flour is about 120 g, but a cup of granulated sugar is 198 g and a cup of honey is 336 g. The tool multiplies your amount by the ingredient’s weight per cup (from King Arthur Baking’s Ingredient Weight Chart, the US baking standard) to convert volume to weight, or divides to go the other way.
For accuracy, baking is best done by weight — a kitchen scale removes the guesswork of how tightly flour is packed. Weights here are per US customary cup (236.6 mL); a metric or Australian cup (250 mL) holds about 6% more.
Frequently asked questions
How many grams is one cup?
It depends on the ingredient. One US cup is about 120 g of all-purpose flour, 198 g of granulated sugar, 226 g of butter, 227 g of water or milk, and 336 g of honey. There is no single grams-per-cup number — that’s why this converter asks which ingredient you mean.
How many grams of flour in a cup?
About 120 g of all-purpose, bread or cake flour per US cup (whole wheat is ~113 g), using King Arthur Baking’s standard. Flour is easily compressed, so scooping straight from the bag can add 20% or more — weighing is far more reliable.
Why do a cup of flour and a cup of sugar weigh different amounts?
Because they have different densities. Sugar granules pack more tightly and are heavier than the fluffy, air-filled particles of flour, so the same volume (one cup) weighs more for sugar (198 g) than flour (120 g).
Is a cup 236 ml or 250 ml?
A US customary cup is 236.6 mL; the metric cup used in Australia, New Zealand and much of Europe is 250 mL — about 6% larger. This tool’s weights are based on the US cup. In baking, that 6% difference can matter.
Should I measure by weight or volume?
Weight (grams) is more accurate and consistent, especially for flour and other easily-packed ingredients. Professional and serious home bakers weigh their ingredients; a cheap digital scale pays for itself in reliable results.