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Choose an ingredient, enter the number of US cups and the converter returns the weight in grams and ounces. Each ingredient has its own density, which is why one cup of flour and one cup of honey weigh very different amounts.
Last reviewed: November 2026. Methods, units and assumptions are explained below and follow our Editorial Policy.
Cups to Grams Converter
Results are estimates based on the values you enter. Nothing you type is sent to or stored on our servers.
Why cups and grams are not the same thing
A cup measures volume, the space an ingredient takes up. A gram measures mass, how much matter is there. Water is the one everyday ingredient where the two line up neatly, because one US cup of water weighs about 237 g. Everything else has its own density. A cup of sifted flour is light and airy, a cup of honey is dense and heavy, and a cup of chopped nuts has gaps between the pieces that a cup of ground nuts does not.
That is why a general rule such as one cup equals 240 g gives wrong answers for most dry ingredients. This converter uses ingredient-specific values, so a cup of all-purpose flour converts to about 120 g, a cup of granulated sugar to about 200 g and a cup of butter to about 227 g.
How to use the converter
- Enter the number of US cups. Decimals work, so 0.75 is three quarters of a cup.
- Select the ingredient that matches what you are measuring.
- Select the convert button.
- Read the weight in grams and the approximate ounces, and note the grams-per-cup value that was used.
If your ingredient is not listed, choose the closest match and treat the result as an approximation, or look at the package for a weight-based serving size and divide to get grams per cup.
Grams per US cup for common ingredients
The values below are the figures used by the converter. They follow widely used baking references and are rounded. Your own cup may deliver slightly more or less depending on technique.
| Ingredient | Grams per cup | Ounces per cup |
|---|---|---|
| All-purpose flour | 120 g | 4.2 oz |
| Bread flour | 127 g | 4.5 oz |
| Whole wheat flour | 113 g | 4.0 oz |
| Granulated sugar | 200 g | 7.1 oz |
| Brown sugar, packed | 213 g | 7.5 oz |
| Powdered sugar | 120 g | 4.2 oz |
| Butter | 227 g | 8.0 oz |
| Water | 237 g | 8.4 oz |
| Whole milk | 245 g | 8.6 oz |
| Honey | 340 g | 12.0 oz |
| Vegetable oil | 218 g | 7.7 oz |
| White rice, uncooked | 185 g | 6.5 oz |
| Rolled oats | 90 g | 3.2 oz |
| Cocoa powder | 85 g | 3.0 oz |
| Chocolate chips | 170 g | 6.0 oz |
How measuring technique changes the weight
Flour is the best example. If you dip a cup into the bag and level it off, you compress the flour and can end up with 140 to 150 g. If you spoon flour into the cup and level the top, you get closer to 120 g. That difference of 20 to 30 g per cup is enough to turn a tender cake into a dry one. Brown sugar is meant to be packed firmly, powdered sugar settles in the bag, and cocoa clumps, so each behaves differently.
Humidity, sifting and the brand of flour add small variations. This is why many recipe developers prefer to give weights. When a recipe lists both cups and grams, trust the grams.
A worked example
Suppose a cake recipe calls for 2 1/2 cups of all-purpose flour, 1 cup of granulated sugar and 1/2 cup of butter. Converting gives 300 g of flour, 200 g of sugar and 113 g of butter. If you are using a kitchen scale, you can place the bowl on the scale, press the tare button, and add each ingredient in turn without extra measuring cups. That means fewer dishes to wash and better consistency every time you bake.
To go in reverse, use the Grams to Cups Converter. For a single spoonful, the Tablespoons to Grams Converter is more convenient.
US cups versus other cup sizes
A US customary cup is about 236.6 mL. A metric cup used in Australia, New Zealand and Canada is 250 mL, and an old imperial cup is about 284 mL. Those differences are about 5 to 20 percent and matter in baking. If you are using a recipe from outside the United States, check which cup it assumes. The converter here uses the US cup. For a recipe written with 250 mL cups, multiply the grams result by about 1.057.
Tips for accurate conversions
- Use a digital scale with 1 g resolution for baking and a tare function.
- Measure liquids in a clear liquid measuring cup, and dry ingredients in dry measuring cups.
- Spoon and level dry ingredients instead of scooping.
- Pack brown sugar firmly only when the recipe says so.
- Write down the grams for recipes you make often so you can skip conversions next time.
Frequently asked questions
How many grams are in one cup of flour?
About 120 g for all-purpose flour using the spoon and level method. Other flours differ, for example 127 g for bread flour and 113 g for whole wheat flour.
Is a cup of sugar 200 grams?
Granulated sugar is about 200 g per US cup. Brown sugar packed is closer to 213 g, and powdered sugar is about 120 g.
Why does my scale not match the chart?
Scoops, humidity and brand differences cause variation. Charts give averages, and a result within a few percent is normal.
Does this work for liquids like milk?
Yes, for the liquids listed. Milk is about 245 g per cup, water about 237 g and honey about 340 g.
Can I convert cups of cooked rice?
Not with this chart. The rice value is for uncooked rice. Cooked rice weighs differently because it contains water.
Related tools
- Grams to Cups Converter
- Tablespoons to Grams Converter
- Butter Measurement Converter
- Ounces to Grams Converter
- Milliliters to Cups Converter
- All cooking converters
Measurement note
Conversions use standard reference values. Ingredient density, packing, humidity, regional measuring standards and equipment accuracy can change real results, so weigh ingredients when precision matters and follow the original recipe where it gives both weights and volumes.