Cups to Grams: The Baker’s Guide to Converting Volume into Weight

A cup of flour and a cup of honey weigh very different amounts. Get the exact grams-per-cup density, formula and filling technique for every baking ingredient.

Introduction

Ask the internet how many grams are in a cup and you will get a single confident number. That number is almost always wrong. A cup is a measure of volume (how much space an ingredient occupies), while a gram is a measure of weight (how much matter it contains). One cup of feathery cake flour and one cup of honey fill exactly the same space, yet the honey weighs three times as much. This is why American recipes written in cups and European recipes written in grams cannot be swapped with one magic multiplier.

The good news is that the conversion is genuinely simple once you know one extra piece of information: the density of the ingredient you are measuring. This guide gives you that density for every ingredient a home baker is likely to reach for, along with the formulas, the worked examples, and the small technique details that quietly ruin bakes.

Why There Is No Single Cups-to-Grams Number

A standard US customary cup holds 236.588 millilitres of space. What that space weighs depends entirely on what you pour into it. Water is the useful reference point, because one millilitre of water weighs almost exactly one gram, so a cup of water weighs roughly 236 grams. Every other ingredient is measured against that baseline:

This is also the reason professional bakeries weigh everything. Volume measurement introduces a variable that weight measurement simply does not have.

The Conversion Formulas

Every cups-to-grams calculation uses the same two formulas. The only thing that changes is the density value, expressed in grams per cup:

Grams = Cups × Grams per Cup

Because a US tablespoon is exactly one sixteenth of a cup and a teaspoon is one forty-eighth, the same density number covers your smaller spoons too. Divide the grams-per-cup figure by 16 for a tablespoon, or by 48 for a teaspoon. One tablespoon of all-purpose flour, for example, is 120 ÷ 16 = 7.5 grams.

Cups to Grams Reference Table

These are the densities used by our own baking calculator, based on the spoon-and-level filling method described further below. They cover the overwhelming majority of home baking:

A Worked Example: Converting a Full Recipe

Imagine a classic American cookie recipe that calls for 2 1/4 cups all-purpose flour, 3/4 cup granulated sugar, 3/4 cup packed brown sugar, 1 cup butter and 2 cups chocolate chips. Converting the whole ingredient list takes about thirty seconds:

Notice what the conversion reveals: the recipe contains 315 g of sugar against 270 g of flour. That ratio is invisible when you read the recipe in cups, and it tells an experienced baker immediately that these cookies will spread thin and chewy rather than stay cakey. Weighing does not just improve accuracy, it makes the structure of a recipe legible.

How You Fill the Cup Changes the Answer

This is the detail that causes most baking failures, and it applies to flour above all. If you dip the measuring cup directly into the flour bag and scoop, you compress the flour against the walls of the cup. That scooped cup can weigh 140 to 150 grams instead of 120 - up to 25 percent more flour than the recipe author intended. Spread across three cups, that is an extra 90 grams, which is the difference between a tender crumb and a dry, tough one.

The standard the 120 g figure assumes is the spoon-and-level method:

Brown sugar is the deliberate exception. It is measured packed, pressed firmly into the cup so it holds its shape when turned out, which is exactly why its density (220 g) is so much higher than granulated sugar in its loose state would suggest.

Not All Cups Are the Same Size

Before you convert, check which cup your recipe was written with, because the volume itself varies by country:

The gram densities in the table above are based on the US customary cup. If your recipe is Australian, multiply the resulting grams by 1.057; if it comes from a vintage British book using imperial cups, multiply by 1.20. For a full breakdown of how these cup standards relate to each other in pure volume terms, our guide to converting cups to milliliters covers the millilitre side of the same question.

Common Mistakes Worth Avoiding

Treating salt as one ingredient

Fine table salt weighs about 273 g per cup, but coarse kosher salt weighs roughly half that for the same volume because of its large, irregular crystals. Substituting one for another by volume is the single most common cause of accidentally over-salted baking. Convert salt by weight whenever the recipe allows it.

Using a liquid cup for dry ingredients

Glass liquid measuring jugs are designed to be read at eye level with headroom above the line, while dry measuring cups are designed to be levelled off flush. Using a jug for flour typically over-measures, because you cannot sweep the top flat.

Converting sifted and unsifted the same way

Read the recipe wording carefully. "1 cup sifted flour" means sift first, then measure, and yields roughly 100-115 g. "1 cup flour, sifted" means measure first, then sift, and yields the full 120 g. The comma changes the weight.

Rounding too early

For a single cookie batch, rounding to the nearest gram is harmless. For bread, where hydration is expressed as a percentage of flour weight, small rounding errors compound quickly. Keep one decimal place until the final figure when you are scaling a dough.

Quick Reference: Common Fractions of a Cup

Using all-purpose flour at 120 g per cup as the worked example, the standard recipe fractions convert as follows. The same proportions apply to any ingredient - just swap in its density:

Conclusion

Converting cups to grams is not a single sum but a two-step habit: identify the ingredient, then multiply by its density in grams per cup. Flour at 120, granulated sugar at 200, butter at 227 and honey at 340 will carry you through most of a recipe book, and the spoon-and-level technique keeps those numbers honest. Once you start weighing, recipes become repeatable in a way that measuring cups can never quite manage.

To skip the arithmetic entirely, our baking converter handles all seventeen ingredients above and converts freely between cups, tablespoons, teaspoons, grams, ounces and millilitres. If you need to move the finished gram figures into imperial weights for postage or an older recipe, our guide to converting grams to ounces takes it from there.

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