A baking conversion calculator turns cups into grams using each ingredient's weight. One cup weighs a different amount for flour, sugar, or butter, so a plain cup-to-gram rule does not work. One cup of all-purpose flour is about 120 grams, one cup of granulated sugar is about 198 grams, and one cup of butter is about 227 grams.
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How to Use the Calculator
- Enter the amount you have.
- Pick the unit that amount is measured in.
- Choose the ingredient from the list.
- Read the weight in grams, plus ounces and volume equivalents.
Here is what each result means:
| Result | What it means |
|---|---|
| Weight in grams | The mass of that amount of the chosen ingredient. |
| In ounces | The same weight in ounces for kitchen scales set to ounces. |
| In cups | The volume that weight fills, useful for the reverse conversion. |
Why Cups and Grams Differ
A cup measures volume, the space an ingredient fills. A gram measures weight. The link between them depends on how heavy the ingredient is for its size, which is its density.
Flour is light and airy, so a cup holds about 120 grams. Sugar is denser, so a cup holds about 198 grams. Butter is denser still, at about 227 grams per cup. That is why one cup-to-gram number cannot cover every ingredient.
How the Conversion Works
The calculator multiplies the volume in cups by the ingredient's weight per cup. If you start from grams, it divides instead to find the volume.
- Convert your amount into cups if it is a volume, or into grams if it is a weight.
- For a volume, multiply cups by the ingredient's grams per cup.
- For a weight, divide grams by the grams per cup to get the volume.
Tablespoons and teaspoons are fractions of a cup, so the same weight per cup covers them too.
Worked Example
Say a recipe calls for 2 cups of all-purpose flour and you want grams.
Calculation: All-purpose flour weighs about 120 grams per cup. Multiply 2 cups by 120 grams to get 240 grams, which is about 8.5 ounces. Going the other way, 240 grams of flour divided by 120 grams per cup returns 2 cups, so the conversion works in both directions.
Common Ingredient Weights
These are the weights this calculator uses for one US cup of each ingredient, based on the King Arthur Baking weight chart.
| Ingredient | 1 cup | 1 tablespoon |
|---|---|---|
| All-purpose flour | 120 g | 7.5 g |
| Granulated sugar | 198 g | 12.4 g |
| Brown sugar (packed) | 213 g | 13.3 g |
| Powdered sugar | 113 g | 7.1 g |
| Butter | 227 g | 14.2 g |
| Honey | 340 g | 21.3 g |
| Cocoa powder | 85 g | 5.3 g |
| Rolled oats | 89 g | 5.6 g |
Cups, Tablespoons, and Teaspoons
Volume units in US recipes follow a simple pattern, no matter the ingredient.
| Unit | Equals |
|---|---|
| 1 cup | 16 tablespoons |
| 1 cup | 48 teaspoons |
| 1 tablespoon | 3 teaspoons |
| 1 cup | 236.6 milliliters |
A stick of US butter is 8 tablespoons, which is half a cup, or about 113 grams.
When to Use This Calculator
Following a Metric Recipe
Many recipes list grams. Convert your cups to grams so you can weigh ingredients and match the recipe exactly.
Baking by Weight
Weighing gives more consistent results than scooping. Convert a cup-based recipe to grams once, then weigh every time.
Scaling a Recipe
Grams are easier to multiply or divide than fractions of a cup, which makes doubling or halving a recipe cleaner.
Common Mistakes
1. Using One Number for Every Ingredient
A cup of flour and a cup of sugar weigh different amounts. Always pick the right ingredient rather than reusing a single conversion.
2. Packing Flour Into the Cup
Scooping packs flour and adds weight. Spoon flour into the cup and level it, which is what the standard weights assume.
3. Confusing US and Metric Cups
A US cup is 236.6 milliliters, while a metric cup is 250. Using the wrong one throws the weight off by about 6 percent.
4. Mixing Up Weight and Volume Ounces
Fluid ounces measure volume, not weight. This calculator's ounces are weight ounces, meant for a kitchen scale.
Accuracy and Limitations
The weights are standard reference values. Real ingredients vary a little with humidity, how finely they are ground, and how you fill the cup.
What it calculates accurately
- Cups to grams for common baking ingredients
- The reverse, from grams back to cups
- Ounce and tablespoon equivalents
What it does not do
- Adjust for packing, sifting, or humidity
- Cover every brand or specialty ingredient
- Convert fluid ounces or metric cups
How We Calculate Conversions
Frequently Asked Questions
How many grams is one cup of flour?
One cup of all-purpose flour weighs about 120 grams when spooned into the cup and leveled. Scooping straight from the bag packs the flour and can push it past 140 grams.
Why is a cup of sugar heavier than a cup of flour?
Sugar is denser than flour. Its crystals pack tightly with little air between them, so the same cup holds about 198 grams of sugar against 120 grams of flour.
Is a cup of butter the same weight as a cup of water?
No. A cup of butter is about 227 grams, while a cup of water is about 237 grams. Butter is slightly less dense than water, so it weighs a little less by the cup.
How many grams are in a tablespoon?
It depends on the ingredient. A tablespoon is one sixteenth of a cup, so it is about 7.5 grams of flour, 12.4 grams of sugar, or 14.2 grams of butter.
Should I weigh or measure ingredients for baking?
Weighing with a scale is more accurate and consistent. Cup measurements change with how you fill them, while grams stay the same every time, which matters most for flour.
Are US cups the same as metric cups?
No. A US cup is 236.6 milliliters and a metric cup is 250 milliliters. This calculator uses US customary cups, so weigh the difference if your recipe is metric.
How many grams is a stick of butter?
A US stick of butter is 8 tablespoons, which is half a cup, or about 113 grams. Two sticks make one cup, at roughly 227 grams.
Is my information saved?
No. The calculation runs in your browser and nothing you enter is stored or sent anywhere, unless you choose Save, which keeps the result only on this device.
Sources
- King Arthur Baking ingredient weight chart (per-cup ingredient weights).
- Cup unit definitions (US customary and metric cups).
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Author
Shakeel Muzaffar is the Founder and Editor-in-Chief of MultiCalculators.com, bringing over 15 years of experience in digital publishing, product strategy, and online tool development. He leads the platform's editorial vision, ensuring every calculator meets strict standards for accuracy, usability, and real-world value. Shakeel personally oversees content quality, formula verification workflows, and the platform's commitment to publishing tools that are genuinely useful for students, professionals, and everyday users worldwide.
