Updated for 2026.
Introduction
Ask ten bakers “how many grams are in a cup” and you will get ten different answers, and every single one of them can be right. That is not a riddle. It is the most misunderstood fact in home baking: the answer changes with the ingredient because grams measure weight while cups measure volume.
This confusion has real consequences. Use 200 grams where a recipe needed 120 and your muffins turn to bricks. Guess at honey when the recipe meant flour and the whole batch goes in the trash. In this guide you’ll learn the exact gram weights for 20 common ingredients, why the numbers differ, and a simple method to never get it wrong again.
In this guide you’ll learn:
- The 5 gram-per-cup numbers that cover 90% of baking
- Why flour, sugar, and honey all give different answers
- How US, metric, and UK cups change the math
- A 3-step method to convert any ingredient with confidence
Table of Contents
- [How Many Grams Is a Cup? The Short Answer](#how-many-grams-is-a-cup-the-short-answer)
- [How Much a Cup in Grams Depends on Density](#how-much-a-cup-in-grams-depends-on-density)
- [How Much Grams in a Cup for Baking Staples](#how-much-grams-in-a-cup-for-baking-staples)
- [How Many G Is a Cup When Recipes Disagree](#how-many-g-is-a-cup-when-recipes-disagree)
- [When the Answer Changes Your Recipe](#when-the-answer-changes-your-recipe)
- [Frequently Asked Questions](#frequently-asked-questions)
- [Conclusion](#conclusion)
How Many Grams Is a Cup? The Short Answer
Quick Answer: How many grams is a cup? For a US cup: 120 grams of all-purpose flour, 200 grams of granulated sugar, 227 grams of butter, 236.6 grams of water, and 340 grams of honey. The ingredient decides the number, always.
“How many grams are in a cup” refers to the weight equivalent of one US customary cup (236.588 ml) for a specific ingredient. It is defined as a density-dependent conversion, which means no universal answer exists. Anyone who gives you one number without naming an ingredient is guessing.
The 5 Numbers Worth Memorizing
If you memorize nothing else from this page, keep these five:
- Flour (all-purpose): 120 g per cup
- Sugar (granulated): 200 g per cup
- Butter: 227 g per cup
- Water: 236.6 g per cup
- Honey: 340 g per cup
These five cover nearly every recipe a home baker meets in a year. Everything else in the charts below is a bonus.
How Much a Cup in Grams Depends on Density
Quick Answer: How much a cup in grams weighs depends entirely on density: how tightly an ingredient’s particles pack together. Fine, airy ingredients like flour weigh less per cup; dense ingredients like honey weigh far more.
What Density Means in Your Kitchen
Density is the amount of mass packed into a unit of volume. In plain terms, it is why a cup of popcorn feels like nothing and a cup of honey feels like a brick. Flour particles are irregular and trap air, so a cup holds relatively little actual flour. Sugar crystals are compact and stack neatly, so the same cup holds much more sugar.
According to the cup (unit) on Wikipedia), the US customary cup holds exactly 236.588 ml. The NIST metric system defines the gram as one-thousandth of a kilogram. Put those together and you get the full picture: a fixed volume on one side, a fixed mass unit on the other, and density bridging the gap.
Light vs. Heavy: Ingredients by Cup Weight
| Category | Example Ingredients | Grams per US Cup |
|---|---|---|
| Very light (under 100 g) | Rolled oats (90 g), cocoa powder (100 g) | 85-100 |
| Light (100-150 g) | AP flour (120 g), powdered sugar (120 g), chopped nuts (120 g) | 100-150 |
| Medium (150-230 g) | White rice (185 g), granulated sugar (200 g), oil (218 g), butter (227 g) | 150-230 |
| Heavy (230-300 g) | Water (236.6 g), milk (245 g), table salt (273 g) | 230-300 |
| Very heavy (300 g+) | Honey (340 g), molasses (328 g) | 300-345 |
Notice the spread: the lightest common ingredients weigh about one-quarter of the heaviest per cup. That range is exactly why “just Google it” fails unless the result names your ingredient.
Q: Does sifting change how many grams are in a cup? A: Yes, noticeably. Sifted flour can weigh 10 to 15 percent less per cup than scooped flour because sifting adds air. Always check whether a recipe means sifted or unsifted when grams matter.
How Much Grams in a Cup for Baking Staples
Here is the detailed breakdown for the ingredients US bakers reach for most. All values are per US cup, spooned and leveled unless noted.
The Flour Family
- All-purpose flour: 120 g
- Bread flour: 127 g
- Cake flour: 114 g
- Whole wheat flour: 113 g
- Almond flour: 96 g
Flour is where technique matters most. And here is the thing most charts will not tell you: the difference between spooned and scooped flour (up to 30 g per cup) is bigger than the difference between flour types. Fix your technique before you worry about the chart.
The Sugar Family
- Granulated sugar: 200 g
- Powdered (confectioners) sugar: 120 g, sifted
- Brown sugar: 220 g, firmly packed
- Raw or turbinado sugar: 200 g
Brown sugar is the trickster of the family. “Firmly packed” is not a suggestion; a loosely filled cup holds roughly 180 g, which throws off any caramel or cookie recipe built on the 220 g standard.
Fats and Liquids
- Butter: 227 g (2 sticks exactly)
- Vegetable oil: 218 g
- Whole milk: 245 g
- Water: 236.6 g
- Honey: 340 g
Butter deserves a special note because US sticks make it foolproof: one stick is 113.5 g, so you can skip the cup entirely. For 250 g into cups of butter, that is 2 sticks plus about 1 tablespoon.
Convert Any Amount in 3 Steps
- Find your ingredient’s grams-per-cup from the lists above.
- Divide your gram amount by that number.
- Round to the nearest quarter cup for practical measuring.
Example: 180 g of granulated sugar / 200 = 0.9 cups, or just under 1 cup. For instant results without the math, our free grams to cups converter does all three steps for 20+ ingredients.
How Many G Is a Cup When Recipes Disagree
You found two charts. One says a cup of flour is 120 g, the other says 125 g. A third says 130 g. Who is right? Usually, all of them, for slightly different definitions of “flour” and “cup.”
US Cups vs. Metric Cups vs. UK Cups
| Cup Standard | Volume | Region | Effect on Grams |
|---|---|---|---|
| US customary | 236.588 ml | United States recipes | Baseline for this guide |
| US legal (nutrition) | 240 ml | US food labels | About 1.4% heavier |
| Metric cup | 250 ml | Australia, NZ, many blogs | About 5.7% heavier |
| Imperial cup | 284 ml | Old UK recipes | About 20% heavier |
A 5.7 percent gap from a metric cup is small enough to ignore in soup and big enough to notice in shortbread. When a recipe lists both grams and cups, trust the grams: they reveal which cup the author used.
Why Two Charts Show Different Numbers
Three reasons explain nearly every disagreement:
- Different measuring technique. Spooned vs. scooped flour shifts results by 25 g per cup.
- Different product definitions. “Flour” might mean all-purpose, bread, or cake flour depending on the chart’s country.
- Rounding choices. Some charts round 236.588 ml to 240 ml, nudging every value up slightly.
Pro Tip: When a recipe gives both grams and cups and they do not match your chart, follow the grams. The recipe author weighed the ingredient; the cup equivalent is just their estimate for readers without scales.
The Anchor Ingredient Method is our framework for resolving conflicts fast: pick one anchor you trust completely (we suggest King Arthur Baking’s published weights), and judge every other chart by how closely it matches your anchor on flour, sugar, and butter. Charts that agree on all three anchors are reliable everywhere else too.
Q: My grandmother’s recipe just says “1 cup flour” with no country. What do I do? A: If the recipe is American, use 120 g. If it is British and old, consider 125-130 g. When the recipe’s origin is unclear, 120 g is the safest default because most online charts standardize on it.
When the Answer Changes Your Recipe
Knowing the numbers is only half the skill. The other half is knowing when they actually change what you do.
Scaling Recipes Up and Down
Doubling a recipe in cups doubles every measurement error too. A 10 g per-cup scooping error becomes 20 g across two cups, then 40 g across four. For large batches, convert everything to grams first with our grams to cups conversion chart, multiply in grams, and convert back only if you must.
Swapping Ingredients by Weight
This is where gram thinking truly pays off. Swapping 200 g of granulated sugar for 200 g of honey is not a 1:1 cup swap (1 cup vs. about 0.6 cups), but it IS a 1:1 weight swap, which keeps the recipe’s structure far more predictable. Professional bakers think in weights for exactly this reason. Our gram to cup guide covers the reverse direction when you need it.
Q: Can I replace sugar with honey cup-for-cup? A: No. One cup of honey weighs 340 g versus 200 g for sugar, so a cup-for-cup swap adds 70 percent more sweetener by weight. Reduce the honey to about 0.6 cups and cut another liquid slightly, since honey adds moisture too.
Frequently Asked Questions
How many grams is a cup of all-purpose flour?
120 grams per US cup, spooned and leveled. This is the single most-used conversion in American baking, published by King Arthur Baking and confirmed across major reference charts. If you scoop directly from the bag, expect up to 150 grams instead, which is why technique matters as much as the number.
How much grams in a cup of sugar?
200 grams of granulated sugar fill one US cup. Powdered sugar is much lighter at 120 grams per sifted cup, while firmly packed brown sugar weighs 220 grams. The word “sugar” alone is not specific enough, so always check which type your recipe means.
How many g is a cup of butter?
227 grams, which is exactly two US sticks. Each stick is 113.5 grams (4 ounces), so butter is one of the few ingredients where the package markings make conversion unnecessary. For European-style butter blocks, just cut by weight using the wrapper’s gram markings.
How much a cup in grams for water?
236.6 grams, because one milliliter of water weighs exactly one gram and a US cup holds 236.588 ml. Water is the baseline every other conversion is compared against. Milk is slightly heavier at 245 grams per cup due to its dissolved solids.
Why do different websites give different answers?
Most differences come from measuring technique (scooped vs. spooned flour), different cup standards (US vs. metric), or rounding. Reputable charts agree within a few grams once you control for those variables. When in doubt, trust sources that name both the technique and the cup standard.
Is 250 ml the same as 1 cup?
Not in the US. A US cup is 236.588 ml, so 250 ml is about 6 percent larger (it equals roughly 1.06 US cups). The 250 ml cup is the metric standard used in Australia and many international recipes. Using the wrong one shifts every gram conversion by that same 6 percent.
How many grams are in half a cup of flour?
60 grams, exactly half of the 120-gram full cup. This linear scaling works for every ingredient: halve the grams for half a cup, quarter them for a quarter cup. It breaks down only if your measuring technique changes between the two measurements.
How many grams are in a cup of rice?
185 grams of uncooked long-grain white rice fill one US cup. Cooked rice is a different story entirely at about 158 grams per cup, since the grains absorb water and change density. Always check whether a recipe means cooked or uncooked before converting.
What about ingredients like oats and cocoa powder?
Rolled oats are very light at 90 grams per cup, while unsweetened cocoa powder sits at 100 grams per cup when spooned. Both are easy to over-measure by scooping, so spoon and level them just like flour for the most accurate results.
Conclusion
The honest answer to “how many grams are in a cup” is that the ingredient writes the answer, not the cup. Memorize the big five (flour 120, sugar 200, butter 227, water 236.6, honey 340), respect density, and check your cup standard on international recipes. Those three habits eliminate nearly every conversion mistake.
Want the math done for you? Try our free grams to cups converter for instant answers across 20+ ingredients.