Grams to Cups Converter

How many cups is a bag marked in grams?

Cups equal grams divided by that ingredient's grams per US cup. Flour in this tool is 120 g per cup. Granulated sugar is 200. Butter is 227. Honey is 339. Water is 237. Those are rounded USDA FoodData Central household measures, not the weight of whatever you happen to scoop today.

A 240 g bag of all-purpose flour is 240 / 120, which is 2.00 cups. A 100 g packet of sugar is 100 / 200, which is 0.50 cup. Same gram number, different cups, because sugar packs more mass into the same cup.

Parents see this when a European brownie tin lists 180 g flour and the only measure at grandma's house is a nested cup set. Convert with the matching ingredient, then scoop as the density note assumes.

180 g flour is 180 / 120 = 1.50 cups. 180 g sugar is 180 / 200 = 0.90 cup. If a traveling grandparent treats every 180 g bag as "almost 2 cups," the brownies from flour will be dry and the syrup from sugar will be short. The ingredient picker is the whole job.

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How to use the grams to cups converter

Type the gram amount from the package or recipe. Choose the ingredient that matches what is in your hand. The highlighted line is cups. The next line is tablespoons (cups times 16). The density line repeats the grams-per-cup constant so you can see which food you selected.

If the food is not in the list, do not pretend cocoa is flour. Look up that food in FoodData Central, find a household cup weight, and only then treat the cup math as a rough kitchen estimate.

Leave the grams box on the number you will actually use, not the whole bag, unless you are emptying the bag into the bowl.

For a 1 kg bag of sugar you plan to split across two weeks of cookies, convert only today's 200 g. 200 / 200 = 1.00 cup. Converting the whole kilo prints 5.00 cups and tempts someone to dump the bag.

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Formula and the densities this page uses

Cups = grams / density, where density is grams per US cup for the selected food.

The constants are kitchen defaults for this site: granulated sugar 200, packed-style brown sugar 220, powdered sugar 120, flour 120, butter 227, oil 218, honey 339, water 237, milk 244, cocoa 86, oats 81, uncooked white rice 185, table salt 292, peanut butter 258, yogurt 245, maple syrup 312, cornstarch 128, breadcrumbs 108. They track common FDC household cup weights after ordinary rounding.

A cup here is a volume cup. Honey at 339 g per cup is heavier than water at 237 g per cup because dissolved sugars raise density. Flour at 120 g per cup is lighter because air sits between particles.

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Worked example: 240 g flour and 100 g sugar

Saturday cookies. The card says 240 g flour and 100 g granulated sugar. You have cups only.

Flour: 240 / 120 = 2.00 cups. Tablespoons would be 32.0. Sugar: 100 / 200 = 0.50 cup. Tablespoons would be 8.0. If you used the flour density on the sugar by mistake, 100 / 120 would print 0.83 cup and the cookies would be much sweeter and wetter than the card intended.

Butter check from the same card: 113 g butter / 227 = 0.50 cup, which is one US stick. That lines up with the butter converter on this site.

Honey on the same card at 170 g is 170 / 339 = 0.50 cup. Water at 170 g is 170 / 237 = 0.72 cup. Sticky sweeteners are not "close enough to water." That 0.22 cup gap is several tablespoons of extra liquid in a granola cluster batch.

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How to scoop so the cup matches the density

For flour, spoon into the cup and level. A cup scooped straight from a compacted bag can weigh 140 g or more. This tool still divides by 120, so a packed scoop reads as more cups than you truly have in the bowl if you reverse the math, and it reads as too little flour if you scoop heavy and call it 1 cup.

Granulated sugar is more forgiving. Level it. Do not tamp. Brown sugar in this table is the packed 220 g cup. If your brown sugar is loose and fluffy, weigh it.

Honey and peanut butter cling. Spray or rinse the cup with a little oil, or weigh the jar on the scale and subtract, instead of fighting a sticky cup that never empties.

Oats at 81 g per cup look like a lot of cups for a small gram number. 81 g is 1.00 cup. A 40 g packet of instant oats is not this row. Instant packets are often closer to a pouch weight than to rolled oats. If the packet lists grams, convert only if you chose oats knowing they are rolled, not a flavored packet with sugar already in it.

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Reading cups and tablespoons, then cooking

Use the cup result for amounts at or above about 1/4 cup. Use the tablespoon line for smaller leftover fractions. 0.19 cup of oil is about 3 tablespoons (0.19 times 16 = 3.0).

If you are converting a whole-grain muffin mix for a lunchbox, convert the dry grams first, mix, then bake. Volume conversion does not change how hot the oven should be or how you store leftovers. Cook poultry mix-ins to 165 °F.

When the cup result is 2.25, measure 2 cups plus 1/4 cup. When it is 0.06 cup of salt, stop using cups. 0.06 times 16 is about 1 tablespoon, and salt at 292 g per cup is a harsh tablespoon. Weigh salt if the card gave grams.

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Label cups versus recipe cups

FDA labeling can treat 1 cup as 240 mL. A recipe cup in this converter is the US customary cup used with the FDC household gram weights. For yogurt, 245 g per cup is a food weight, not a promise that every brand's 1 cup serving on the label weighs 245 g.

Read the gram line on the yogurt tub if you care about sugar later. Cups from this tool are for mixing, not for the Added Sugars Daily Value on the panel.

A 245 g cup of yogurt is almost 1.00 cup here (245 / 245). That is useful when a smoothie card says 120 g yogurt and you only have a 1/2 cup scoop: 120 / 245 = 0.49 cup. The sugar story still lives on the lid. Plain yogurt and fruit-on-the-bottom yogurt can share a cup weight and not share an Added Sugars line.

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Accuracy limits, edge cases, and safety

Cake flour, bread flour, and whole wheat flour do not share the 120 g cup. Almond flour is denser. Instant oats are not rolled oats at 81 g. Using the wrong row is the main error on this page.

Settled cocoa at 86 g per cup can still swing if you sift. Sifted cocoa is lighter. If the ganache splits, weigh next time.

Keep raw flour out of tasting bowls. Raw wheat flour can carry pathogens. Bake the batter. Do not let kids lick a raw flour cup the way they might lick cake batter in older family stories.

Rice at 185 g per cup is uncooked white rice. 185 g is 1.00 cup dry. Cooked rice is a different food and a different cup weight. Do not convert leftover cooked rice with the dry row or a fried-rice night will be a brick.

Oil at 218 g per cup is close to water but not water. 109 g of oil is 0.50 cup. If you pour oil in a liquid cup to the 1/2 cup line you are near that gram target. If you weigh 109 g of water you have a different ingredient.

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How it works

Household cup weights come from USDA FoodData Central style measures, rounded for home kitchens. Packed brown sugar is denser than granulated sugar.

Frequently asked questions

• Why do flour cups vary?

  Scooping vs spooning changes how much air is in the cup. Weighing grams is more repeatable.

• Can I use this for liquids?

  Yes for milk, water, oil, honey, and maple. Density still differs from water.

Related calculators

References

1. USDA. FoodData Central
2. FDA. Guidelines for Determining Metric Equivalents of Household Measures
3. USDA FSIS. Safe Minimum Internal Temperature Chart
4. FDA. Added Sugars on the Nutrition Facts Label
5. USDA / HHS. Dietary Guidelines for Americans
6. NIST. SI Units - Volume
7. eCFR / FDA. 21 CFR 101.9 Nutrition labeling of food