Cups to Grams: Why One Cup Is Never One Number
Written by the Calculator Heaven team ·
Ask how many grams are in a cup and the only correct reply is: a cup of what? Cups measure volume and grams measure weight, so the answer changes with every ingredient. A US cup of water weighs 237 grams. A cup of all-purpose flour weighs about 125 grams, barely half as much.
What a cup of common ingredients weighs
These are typical weights for one US cup (236.6 mL), with dry goods spooned in and leveled. The cups to grams converter handles any amount.
| Ingredient | 1 cup | 1/2 cup | 1/4 cup |
|---|---|---|---|
| Water or milk | 237-245 g | 118-123 g | 59-61 g |
| All-purpose flour | 125 g | 63 g | 31 g |
| Granulated sugar | 200 g | 100 g | 50 g |
| Brown sugar, packed | 220 g | 110 g | 55 g |
| Powdered sugar | 120 g | 60 g | 30 g |
| Butter | 227 g | 113 g | 57 g |
| Honey | 340 g | 170 g | 85 g |
| Rolled oats | 90 g | 45 g | 23 g |
| Cocoa powder | 85 g | 43 g | 21 g |
Look at the spread. Honey is four times as heavy as cocoa powder for the same cup. Any chart that offers a single cups-to-grams figure is quietly assuming you are measuring water.
Why flour causes the most trouble
Flour compresses. Dip the cup straight into the bag and you pack in 140 to 150 grams. Spoon it in lightly and level the top, and you get about 125. That 20% swing is the difference between a tender cake and a dry one, and it is the most common reason a recipe "didn't work".
Sugar, salt and liquids pour and settle the same way every time, so cup measures are dependable for them. Flour, cocoa and powdered sugar are the ones worth weighing.
Is your cup the same as the recipe's cup?
Not always. A US cup is 236.6 mL. Australia, Canada and the UK use a 250 mL metric cup, about 5% bigger. Older British recipes may mean an imperial cup of 284 mL. On a single cup the difference is small; across a whole recipe it adds up.
Tablespoons differ too: 14.8 mL in the US, 15 mL in most metric countries, and 20 mL in Australia. If a recipe was written abroad, the cooking converter helps you check the volumes, and the oven temperature converter sorts out Celsius, Fahrenheit and gas mark.
Butter is the easy one
In the US, butter comes in 4-ounce sticks with tablespoons marked on the wrapper. One stick is half a cup, 8 tablespoons or 113 grams. The butter converter covers the rest.
When to use cups and when to weigh
- Weigh for baking: bread, cakes, pastry and macarons depend on ratios, and a scale removes the guesswork.
- Cups are fine for cooking: soups, stews and sauces tolerate a little more or less of almost anything.
- Weigh sticky things. Putting the bowl on the scale and pouring honey to 85 grams is easier than scraping out a quarter cup.
- For small amounts of salt, yeast or baking powder, measuring spoons are more practical than most kitchen scales. The tablespoons to grams converter gives the weights.
Converting a favorite recipe once and writing the gram weights in the margin saves doing the sums again. Go from weight back to volume with the grams to cups converter.
Try the Baking Conversions CalculatorConvert any baking ingredient between cups, tablespoons, grams and ounces, by weight or volume.