Cups to Grams Converter
Our free Cups to Grams Converter turns volume measurements into weight instantly. Pick an ingredient, enter an amount, and convert between cups, tablespoons, teaspoons, milliliters, fluid ounces, grams, and ounces. Perfect for baking recipes that call for cups when your scale speaks grams.
Enter your ingredients
🧁 Density: 120 g per US cup (all-purpose flour).
Your result
How to use this calculator
Choose the ingredient you're measuring from the dropdown — the converter uses a standard density (grams per cup) for each one. Enter the amount, pick the unit you're converting from and the unit you want, and the result updates instantly as you type. There's no need to press Convert, but the button is there if you prefer it.
Because weight-to-volume conversions depend on density, conversions between two volume units (like tablespoons to cups) don't need an ingredient, while anything involving grams or ounces does. The calculator automatically applies the right density whenever a weight unit is involved.
How it works
Cups measure volume and grams measure weight, so converting between them requires knowing the ingredient's density — how many grams fit in one US cup. The calculator first converts your amount to grams: weight inputs (grams, ounces) convert directly (1 oz = 28.3495 g), while volume inputs are first turned into cup-equivalents (1 cup = 16 tbsp = 48 tsp = 236.588 ml = 8 fl oz) and then multiplied by the ingredient's grams-per-cup.
Once it has the weight in grams, it converts outward to your target unit. For example, 2 cups of all-purpose flour becomes 2 × 120 g = 240 g, and 1 tablespoon of butter is (1/16) × 227 g ≈ 14.2 g.
A word of caution: packed vs. sifted makes a difference. Sifted flour is lighter and fluffier than flour scooped straight from the bag, so actual weights can vary by 10–15% from these standard densities. For the most consistent baking, use a kitchen scale and weigh ingredients directly.
Quick reference: common cups-to-grams conversions
| 1 US cup of… | Grams | Ounces |
|---|---|---|
| All-purpose flour | 120 g | 4.2 oz |
| Granulated sugar | 200 g | 7.1 oz |
| Brown sugar (packed) | 220 g | 7.8 oz |
| Powdered sugar | 120 g | 4.2 oz |
| Butter | 227 g | 8.0 oz |
| Milk | 240 g | 8.5 oz |
| Water | 237 g | 8.4 oz |
| Honey | 340 g | 12.0 oz |
| Cocoa powder | 100 g | 3.5 oz |
| Rolled oats | 90 g | 3.2 oz |
This converter uses the US cup (236.588 ml). Values are standard baking densities, rounded.
Frequently asked questions
Why is weighing ingredients more accurate than measuring in cups?
A cup measures volume, so its weight changes with how tightly an ingredient is packed, humidity, and settling. One cup of flour can weigh anywhere from 110 to 140 grams depending on how you scoop it. A kitchen scale removes that variation, which is why professional bakers weigh ingredients instead of using cups.
Is a US cup the same as a metric cup?
No. A US cup is 236.588 ml, while a metric cup (used in Australia and some international recipes) is 250 ml — about 5.7% larger. This converter uses the US cup of 236.588 ml.
Does sifted vs packed flour change the conversion?
Yes. Sifted flour is aerated and lighter — closer to 114 grams per cup — while flour scooped straight from the bag can be packed to 130 grams or more per cup. The default 120 grams per cup assumes the common spoon-and-level method.
How many grams are in a cup of flour, sugar, and butter?
One US cup of all-purpose flour is about 120 grams, one cup of granulated sugar is about 200 grams, and one cup of butter is about 227 grams. These are weight conversions based on ingredient density.
Can I convert tablespoons to grams?
Yes. Select an ingredient, enter your tablespoon amount, and choose grams as the result unit. For example, 1 tablespoon of butter converts to about 14.2 grams.