Quick example
Convert 1 US cup of all-purpose flour to grams
Select all-purpose flour, enter 1, and convert from US cups to grams. Using the page's reference of 120 grams per level US cup, the result is 120 grams.
Why the ingredient matters
Volume and weight measure different things
Grams, kilograms, ounces, and pounds measure weight. Cups, tablespoons, teaspoons, milliliters, and liters measure volume. Moving between those groups requires an ingredient-specific weight per volume.
For example, this tool uses 120 grams per US cup for all-purpose flour, 198 grams for granulated sugar, and 336 grams for honey. The same one-cup volume therefore produces three very different weights.
Quick reference
Selected ingredient weights per US cup
| Ingredient | Reference weight |
|---|---|
| All-purpose flour | 120 g |
| Granulated sugar | 198 g |
| Brown sugar, packed | 213 g |
| Butter | 227 g |
| Honey | 336 g |
| Rolled oats | 89 g |
| Table salt | 288 g |
| Diamond Crystal kosher salt | 128 g |
Metric and US measures
The volume definitions used here
A metric teaspoon is 5 milliliters, a metric tablespoon is 15 milliliters, and a metric cup is 250 milliliters. A US customary teaspoon is exactly 4.92892159375 milliliters, a US tablespoon is three US teaspoons, and a US cup is exactly 236.5882365 milliliters.
Weight ounces are avoirdupois ounces, where one ounce is exactly 28.349523125 grams and one pound is exactly 453.59237 grams.
Estimate carefully
Packing, brands, and preparation change cup weights
These are practical kitchen references, not guarantees. Scooped flour may weigh more than gently spooned flour. Chopped and whole nuts occupy space differently. Salt crystal size varies enough that two common kosher salt brands are listed separately. For repeatable baking, weigh the ingredient directly when a recipe provides grams.
Sources and method
Where the reference values come from
Unit definitions follow NIST volume guidance and exact international pound relationships. Each food ingredient links to its King Arthur Baking or USDA FoodData Central reference beside your result, with preparation notes. Greek yogurt uses a published King Arthur recipe portion; USDA portions come from its SR Legacy dataset. Smaller portions are scaled to one US cup; for example, 21 grams of honey per tablespoon becomes 336 grams per cup.
All 93 food-ingredient references were checked September 24, 2026. Water, the remaining entry, uses the approximate density of 1 gram per milliliter. Published cup weights can differ because of preparation, measurement, and rounding; these are practical estimates, not laboratory densities. Prefer your recipe's own weight or a scale when brands, preparation, or precision matter.
Common questions
Ingredient conversion FAQ
How many grams are in one cup of flour?
This converter uses 120 grams per US cup for all-purpose flour. Other flour types have separate entries. Scooping and packing can change the actual weight.
Can one cups-to-grams conversion work for every ingredient?
No. Cups measure volume and grams measure weight. Each ingredient needs its own reference cup weight to convert between the two.
Can I enter recipe fractions?
Yes. Enter 1/2, 1 1/2, or a decimal such as 0.5. You can also paste fractions such as ½.
What is the difference between a metric cup and a US cup?
This tool defines a metric cup as 250 milliliters and a US customary cup as exactly 236.5882365 milliliters. Select the type used by your recipe.
Why are two types of kosher salt listed?
Diamond Crystal and Morton's kosher salts have different crystal sizes and cup weights. They cannot be substituted by equal volume using the same conversion.
Can I add an ingredient that is not listed?
Choose Custom ingredient density and enter its known grams-per-US-cup value. Use the reference from your recipe or package if it differs from our estimate.
Should I weigh ingredients for baking?
Yes when possible. Direct weighing avoids differences caused by scooping, packing, chopping, and settling. The converter provides estimates, not guaranteed densities.