Cups to Grams: The Only Cooking Measurement Conversion Guide You Need (2026)

A cup of flour and a cup of water both measure one cup. One weighs 120 grams. The other weighs 240 grams. If you're baking and you treat them the same, your bread will be dense, your cake will collapse, and you'll spend twenty minutes wondering what went wrong.

This is the fundamental problem with volume measurements in cooking. A cup measures space, not mass. And since different ingredients pack differently, the same volume can mean wildly different weights.

Why American recipes use cups and European recipes use grams

The cup measurement dates to the late 1800s in the US, popularized by Fannie Farmer in her 1896 cookbook. She standardized it as 8 fluid ounces — practical at the time because it relied on equipment already in every kitchen.

Grams took hold in Europe because the metric system was already entrenched by the time modern cookbooks emerged. Weighing on a kitchen scale is more precise and less dependent on technique. A gram of flour is always a gram of flour. A cup of flour depends on whether you scooped it or spooned it, whether it was sifted, and how humid the day is.

Professional bakers universally use weight. The reasons are precision and reproducibility: a recipe that calls for 240 grams of flour produces the same result in Lisbon and in Toronto, regardless of the baker's scooping style.

The most common conversions — with the numbers that actually matter

These are the weights per cup for the ingredients people convert most often:

| Ingredient | 1 Cup | ½ Cup | ¼ Cup | |---|---|---|---| | All-purpose flour | 120–130 g | 60–65 g | 30–33 g | | Bread flour | 120–130 g | 60–65 g | 30–33 g | | Cake flour | 100 g | 50 g | 25 g | | Granulated sugar | 200 g | 100 g | 50 g | | Brown sugar (packed) | 220 g | 110 g | 55 g | | Powdered sugar | 120 g | 60 g | 30 g | | Butter | 227 g | 113 g | 57 g | | Cocoa powder | 85–100 g | 43–50 g | 21–25 g | | Rolled oats | 90 g | 45 g | 23 g | | Honey | 340 g | 170 g | 85 g | | Milk | 240 g | 120 g | 60 g | | Water | 240 g | 120 g | 60 g | | Olive oil | 216 g | 108 g | 54 g |

Notice the range on flour: 120–130 grams per cup depending on how you measure. This is the range between a properly spooned cup and a scooped-and-packed cup. It sounds small. In a recipe that calls for 3 cups of flour, that's a 30-gram difference. Enough to change the texture of a loaf.

Tablespoons and teaspoons — the conversions nobody has memorized

| Volume | Metric | |---|---| | 1 teaspoon (tsp) | 5 mL / ~5 g water | | 1 tablespoon (tbsp) | 15 mL / ~15 g water | | 1 fluid ounce | 30 mL | | 1 cup | 240 mL | | 1 pint (US) | 473 mL | | 1 quart (US) | 946 mL | | 1 gallon (US) | 3.785 L |

A tablespoon is 3 teaspoons. A cup is 16 tablespoons. These two relationships eliminate most recipe math.

For dry ingredients like salt and baking powder, a teaspoon weighs roughly 5–6 grams and a tablespoon 15–18 grams — close enough for leavening and seasoning purposes where precision matters less than it does for flour.

Ounces: the unit that means two different things

Ounces cause more confusion in cooking than almost any other unit because "ounce" can mean weight (avoirdupois ounce, used for solid ingredients) or volume (fluid ounce, used for liquids). They are not interchangeable.

1 fluid ounce of water weighs approximately 1 ounce by weight. This works for water and liquids close to water's density. It falls apart for everything else.

1 fluid ounce of honey weighs about 1.5 ounces. 1 fluid ounce of vegetable oil weighs about 0.9 ounces. A recipe that says "4 oz of honey" could mean 4 fluid ounces (about 170 g) or 4 weight ounces (about 113 g). The difference matters.

When a recipe says "oz" for a solid, assume weight ounces. When it says "fl oz," assume fluid ounces. When it's ambiguous and precision matters, use the weight version.

The tool that solves this

Rather than memorizing every conversion table, use the Unit Converter. It handles mass and volume for cooking ingredients — type in the amount, select the units, get the result. No mental arithmetic, no guessing at ranges.

For baking especially, a kitchen scale solves the problem entirely. They cost between $10 and $20, take up almost no space, and eliminate the entire cups-vs-grams debate. Once you start baking by weight, you won't go back to volume measurements.

The one conversion worth memorizing

If you remember nothing else from this guide: 1 cup of water = 240 mL = 240 g. For liquids close to water's density (milk, most juices, broth), this is accurate enough for any recipe. For everything else — especially flour, sugar, and fats — use a table or a converter.

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Frequently asked questions

How many grams is 1 cup of flour?

Approximately 120–130 grams for all-purpose flour, depending on how you measure. Spooning flour into the cup and leveling off gives you about 120 g. Scooping directly from the bag can pack it up to 150 g or more. For consistent results, either weigh your flour or use the spoon-and-level method.

Is 1 cup always 240 mL?

In the US, yes — a standard US cup is 240 mL (technically 236.6 mL). However, a metric cup used in Australia and Canada is 250 mL. A British imperial cup is 284 mL. For most recipes, the difference is small enough to ignore. For precise baking, check which cup standard the recipe uses.

How do I convert a US recipe to grams?

Look up the weight per cup for each ingredient (flour, sugar, butter, etc.), then multiply by the number of cups. A cup of all-purpose flour is about 120 g, granulated sugar is 200 g, butter is 227 g. After the first conversion, write the weights on the recipe so you don't have to look them up again.

Why do professional bakers use grams instead of cups?

Weight measurements are reproducible. The same ingredient weighed on a scale gives the same result every time, regardless of technique, humidity, or how settled the ingredient is in its container. Volume measurements like cups vary by as much as 20% depending on how the ingredient is scooped. For something like a croissant dough where hydration ratios matter to within a few percent, that variance is the difference between success and failure.

How many tablespoons are in a cup?

Sixteen. A cup is 16 tablespoons, or 48 teaspoons. This relationship is worth memorizing: if a recipe calls for ¼ cup and you only have a tablespoon measure, that's 4 tablespoons.