If you’ve ever followed an international recipe, you’ve probably wondered: How many grams are in a cup?
The answer isn’t always straightforward because cups measure volume, while grams measure weight. The number of grams in one cup depends on:
- The ingredient you’re measuring
- Whether you’re using a U.S. cup or a metric cup
- How densely the ingredient is packed
For example:
- 1 U.S. cup of all-purpose flour weighs about 120 grams
- 1 U.S. cup of granulated sugar weighs about 200 grams
- 1 U.S. cup of butter weighs about 227 grams
In this guide, you’ll learn the most common cup-to-gram conversions for baking and cooking, understand the difference between U.S. and metric cups, and find practical conversion charts.
Quick Answer
There is no single answer to “How many grams are in a cup?”
Here are some common conversions using a U.S. cup:
| Ingredient | 1 US Cup |
|---|---|
| All-purpose flour | 120 g |
| Bread flour | 125 g |
| Granulated sugar | 200 g |
| Brown sugar (packed) | 220 g |
| Powdered sugar | 120 g |
| Butter | 227 g |
| Rolled oats | 90 g |
| White rice (uncooked) | 185 g |
| Honey | 340 g |
| Milk | 240 g |
| Water | 236 g |
Why Cups and Grams Are Different
A cup measures volume, while grams measure weight.
Imagine filling two identical cups:
- One with feathers
- One with sand
Both fill the same amount of space (one cup), but the sand weighs much more. The same principle applies to flour, sugar, rice, oats, and other ingredients.
US Cup vs. Metric Cup
Recipes from different countries may use different cup sizes.
| Cup Type | Volume |
| U.S. Cup | 236.6 mL |
| Metric Cup (Australia, New Zealand, etc.) | 250 mL |
A metric cup is slightly larger than a U.S. cup, so ingredient weights increase slightly.
Common Ingredient Conversion Chart (US & Metric Cups)
| Ingredient | US Cup | Metric Cup |
| All-purpose flour | 120 g | 125 g |
| Bread flour | 125 g | 130 g |
| Cake flour | 110 g | 115 g |
| Granulated sugar | 200 g | 210 g |
| Brown sugar | 220 g | 230 g |
| Powdered sugar | 120 g | 125 g |
| Butter | 227 g | 250 g |
| Rolled oats | 90 g | 95 g |
| White rice | 185 g | 195 g |
| Honey | 340 g | 355 g |
| Water | 236 g | 250 g |
| Milk | 240 g | 250 g |
These values are approximate and may vary slightly depending on the brand and measuring method.
Flour Conversion
Flour is one of the most common baking ingredients, but it’s also one of the easiest to measure incorrectly.
| Flour Type | US Cup |
| All-purpose flour | 120 g |
| Bread flour | 125 g |
| Cake flour | 110 g |
| Whole wheat flour | 130 g |
For the most accurate results:
- Spoon flour into the measuring cup.
- Level it with a straight edge.
- Avoid packing it down.
Sugar Conversion
Different types of sugar have different weights.
| Sugar Type | US Cup |
| Granulated sugar | 200 g |
| Brown sugar (packed) | 220 g |
| Powdered sugar | 120 g |
| Caster sugar | 200 g |
Packed brown sugar weighs more because it is compressed.
Butter Conversion
Butter is often measured in cups and grams.
| Butter | Weight |
| ¼ cup | 57 g |
| ½ cup | 113 g |
| ¾ cup | 170 g |
| 1 cup | 227 g |
Many butter packages also include measurement markings to make cutting easier.
Rice, Oats, and Grains
| Ingredient | US Cup |
| White rice | 185 g |
| Brown rice | 195 g |
| Rolled oats | 90 g |
| Quinoa | 170 g |
These weights refer to uncooked grains.
Liquid Ingredients
For liquids, the weight is often close to the volume because many liquids have a density similar to water.
| Ingredient | US Cup |
| Water | 236 g |
| Milk | 240 g |
| Vegetable oil | 218 g |
| Honey | 340 g |
| Maple syrup | 315 g |
Why Professional Bakers Use Grams
Professional bakers prefer grams because they are:
- More accurate
- Easier to scale
- Consistent worldwide
- Not affected by packing or measuring technique
Using a digital kitchen scale can improve baking results.
Tips for Accurate Measuring
- Use dry measuring cups for dry ingredients.
- Use liquid measuring cups for liquids.
- Level dry ingredients with a straight edge.
- Do not pack flour unless a recipe specifically says to do so.
- Always check whether a recipe uses U.S. or metric cups.
Common Kitchen Conversions
| Measurement | Equivalent |
| 1 U.S. cup | 236.6 mL |
| 1 Metric cup | 250 mL |
| ½ cup | 118 mL (US) |
| ¼ cup | 59 mL (US) |
| 1 tablespoon | 15 mL |
| 1 teaspoon | 5 mL |
FAQs
How many grams are in one cup?
It depends on the ingredient.
For example:
- Flour: 120 g
- Sugar: 200 g
- Butter: 227 g
Why doesn’t one cup always weigh the same?
Because cups measure volume, while grams measure weight. Different ingredients have different densities.
Is a U.S. cup the same as a metric cup?
No.
- U.S. cup = 236.6 mL
- Metric cup = 250 mL
How many grams are in a cup of flour?
One U.S. cup of all-purpose flour weighs about 120 grams.
How many grams are in a cup of sugar?
One U.S. cup of granulated sugar weighs about 200 grams.
Should I use cups or grams for baking?
Grams are more accurate and are recommended for the best baking results.
Can I use a kitchen scale instead of measuring cups?
Yes. A digital kitchen scale provides the most consistent and accurate measurements.
Common Mistakes to Avoid
- Assuming every ingredient weighs the same.
- Mixing U.S. and metric cup sizes.
- Packing flour into the cup.
- Ignoring recipe measurement systems.
- Estimating instead of weighing ingredients.
Avoiding these mistakes helps ensure better cooking and baking results.
Quick Facts
- Cups measure volume.
- Grams measure weight.
- 1 U.S. cup = 236.6 mL
- 1 Metric cup = 250 mL
- Flour: 120 g per U.S. cup
- Sugar: 200 g per U.S. cup
- Butter: 227 g per U.S. cup
- A kitchen scale provides the most accurate measurements.
Final Thoughts
The answer to “How many grams are in a cup?” depends entirely on the ingredient you’re measuring. While cups measure volume, grams measure weight, so flour, sugar, butter, rice, and liquids all have different gram values.
For the most accurate cooking and baking, especially when using recipes from different countries, it’s best to use a digital kitchen scale and verify whether the recipe uses U.S. cups or metric cups. With the conversion charts in this guide, you’ll be able to measure ingredients confidently and achieve consistent results every time.
