"Cups to Grams: Baking Conversion Chart for 40+ Ingredients"

A cup of flour can weigh 120 grams or 150 grams depending on how it got into the cup. That 25% swing is the difference between a cake that works and one that comes out dense and sad. If you bake from recipes that mix cups and grams, or you are scaling a recipe up for the holidays, this guide gives you the real numbers and the traps to avoid.

The short version: weigh when you can, and when you can't, use the right number for the right ingredient. A "universal" 240 grams per cup only works for water and milk. Everything else drifts, sometimes a lot.

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The core numbers: how many grams in a cup

These are scoop-and-level weights for the US customary cup (236.59 mL), which is what nearly all American recipes mean when they say "cup":

Two entries on that table quietly ruin more recipes than the rest combined: flour and brown sugar. Flour varies with how you fill the cup, and brown sugar varies with how hard you press it. We'll fix both below.

For any ingredient not on this list, the fastest path is the ingredient-specific converter: it covers 40+ ingredients from cream cheese to coconut milk, each with its own tested weight per cup, and it converts cups, tablespoons, and teaspoons in either direction.

Why a cup of flour weighs 120, 135, or 150 grams

Scoop a measuring cup straight into the flour bag and you compress the flour as you drag it through. That "dip and sweep" cup can hit 150 grams. Spoon the flour in gently and level it off with a knife and you land near 120 grams. Sift it first and you drop to roughly 100 grams.

Same cup. Three different weights. Up to 25% more flour than the recipe writer used.

This is why serious bakers weigh ingredients, and why recipe sites increasingly list grams first. A scale removes the technique variable completely: 120 grams is 120 grams whether you scooped, spooned, or sifted.

If you own a scale, use it for flour, cocoa powder, and powdered sugar above all. Those three compress the most. If you don't own one yet, at least switch to the spoon-and-level method so your cups match the numbers the recipe was tested with.

If a recipe gives you cups and you want grams, use a converter built on ingredient densities rather than a single multiplier. The flour converter handles the AP, bread, and whole-wheat weights plus the sifted variant, and does tablespoons and teaspoons too.

The butter trap: sticks, cups, and grams

Butter in the US is sold in sticks, and the math is clean if you know it:

• 1 stick = 113.4 g = 8 tablespoons = half a cup
• 2 sticks = 227 g = 1 cup
• 1 tablespoon of butter = 14.2 g

The trap is European recipes. A British or German recipe listing "1 cup butter" was likely tested with a different cup (the US cup is 236.59 mL, the metric cup 250 mL) and sometimes assumes a slightly different fat content. When a recipe matters, convert to grams and weigh. The butter converter does stick, tablespoon, cup, and gram conversions in one place, which settles most arguments mid-bake.

Sugar: packed, loose, and the powdered surprise

White sugar is forgiving: 200 grams per cup, scoop and level, done. Brown sugar is the opposite. Packed firmly it hits 220 grams; loose it can be closer to 170. Most recipes mean packed, so press it into the cup until it holds the cup's shape when turned out.

Powdered sugar is the surprise: it looks like it should be heavy, but it is mostly air. A cup weighs about 120 grams unpacked, or roughly 105 if the recipe means sifted. That means powdered sugar and all-purpose flour weigh nearly the same per cup, which feels wrong and is true anyway.

The sugar converter covers white, brown, and powdered weights with the packed and unpacked numbers side by side.

Liquids are not all water (but they're close)

Water is the baseline: 237 grams per cup, effectively its volume in milliliters. Milk lands at 240. Buttermilk is nearly the same as milk. Then it drifts:

• Oils are lighter than water, around 216-218 g per cup, because oil floats on water for a reason
• Honey is much denser at 340 g per cup
• Maple syrup sits at 322 g
• Corn syrup lands near 328 g

The syrup family is where cup-to-gram conversion matters most for candy and frosting work. Substituting a cup of honey for a cup of water by volume adds over 100 grams of sugar to the recipe. If a frosting comes out cloying or a candy batch sets wrong, an unconverted syrup is a common culprit.

Scaling recipes for a crowd: the holiday math

Doubling a cookie recipe in cups doubles your measurement error too. That 15-gram flour mistake becomes 30. At triple scale, small cup errors turn into real texture problems: dry cookies, tough dough, sunken cakes.

The fix is to convert to grams once, then scale the grams:

1. Convert every ingredient to grams using the per-ingredient numbers above
2. Multiply the grams by your scale factor (double, triple, 1.5x)
3. Write the scaled gram list on paper and bake from that

Two scaling rules that get skipped:

• Don't scale leavening linearly past double. Baking soda and powder don't need to triple when you triple the recipe; the surface-area-to-volume ratio of the batter changes. At large scale, reduce leavening by roughly 10-20% from the straight multiple and expect to adjust once.
• Watch pan size, not just quantities. Tripled batter in the same pan needs longer baking at a lower temperature, which changes the recipe more than the ingredient math does.

For a quick check of the multiplication itself (halving awkward amounts like 340 g of honey, or scaling 170 g of chips for 1.5 batches), a proportion calculator does the cross-multiplication without mental math errors mid-bake.

The measuring-cup honesty test

If you want to know whether your cups are the problem, weigh a cup of water. It should read 237 grams (or 240, close enough). If your cup gives you 210 or 260, the cup itself is off, and every volume recipe you make drifts with it.

Cheap nested measuring cups are molded plastic with generous tolerances. A single test with water tells you in ten seconds whether to trust them. While you are at it, check your tablespoon: 1 tablespoon of water is 15 grams, and your set should land within a gram of that.

FAQ

How many grams are in a cup of flour?

120 grams for all-purpose flour, spooned into the cup and leveled with a knife. Scooping the cup directly into the bag compresses the flour and can give you up to 150 grams, which is 25% more than most recipes were tested with. Weighing 120 grams on a scale removes the guesswork entirely.

Is a cup always 240 grams?

Only for milk and close-to-water liquids. Water itself is 237 grams per US cup. But ingredients have different densities: a cup of rolled oats is about 90 grams, a cup of honey is 340 grams, and a cup of chocolate chips is 170 grams. Using 240 as a universal multiplier produces wrong numbers for almost everything except liquids.

How do I convert cups to grams without a scale?

Use a conversion tool built on per-ingredient densities: enter the ingredient and the cup amount, and it returns the gram weight. The cooking conversion hub lists 40+ ingredients, each with tested weights for cups, tablespoons, and teaspoons. This works in the other direction too, when a European recipe gives grams and your kitchen only has cups.

How much does 1 cup of brown sugar weigh?

220 grams when packed firmly, which is what most recipes mean. Loose brown sugar weighs closer to 170 grams per cup. The 50-gram gap is why "packed" appears in nearly every brown sugar line: press it into the cup until it holds its shape when dumped out.

Why do my cookies come out different every time I use cups?

Because cup measurements depend on your scooping technique, and flour is the ingredient that compresses most. A dip-and-sweep cup of flour can hold 25-30 grams more than a spooned and leveled one, which is enough to turn a chewy cookie cakey or a soft cookie dry. Converting the recipe to grams once, then baking from the gram list, makes every batch identical.

How many grams is 1 stick of butter?

113.4 grams, which is 8 tablespoons or half a cup. Two sticks are 227 grams, a full cup. If a recipe lists grams and your butter is in sticks, the butter converter converts sticks, tablespoons, cups, and grams in either direction.