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Cups to Grams Converter
Convert cups to grams for 47 common ingredients, using real density data. Pick the ingredient, set the amount, get the weight.
How it works
Behind the numbers
A cup measures volume and a gram measures mass, so the same cup of flour and sugar weigh different amounts. Each ingredient has its own density, and this converter stores the typical grams per US cup for 47 of them, drawn from published baking weight charts. You enter an amount in cups, tablespoons, teaspoons, fluid ounces, or milliliters, and the math scales the reference weight to your amount.
The cup standard matters more than most recipes admit. A US customary cup is 236.588 ml, the US legal cup used on nutrition labels is 240 ml, the metric cup is 250 ml, and the imperial cup is 284.131 ml. Switch between them above and watch the result move by up to 20 percent. If your recipe came from an American blog, US customary is almost always the right pick.
Even with the right numbers, volume measuring has a built-in wobble. Scooping flour straight from the bag can pack 15 to 30 percent more into the cup than spooning it in lightly. Treat the result as a solid estimate, and for baking that must come out the same every time, weigh the ingredients on a scale. Everything runs in your browser; nothing you type leaves the page.
FAQ
Questions, answered
How many grams are in a cup of flour?
A US cup of all-purpose flour weighs about 120 grams when spooned and leveled. Scoop it straight from the bag and the same cup can hold 140 grams or more, because packing changes the density. That spread is exactly why weight beats volume for flour: 120 grams is 120 grams no matter who measures it.
Why does the converter ask for the ingredient?
Because a cup is volume and a gram is weight, and density connects the two. A cup of honey weighs about 336 grams while a cup of flour weighs 120. Any converter that gives one number for every ingredient is guessing. Picking the ingredient swaps in the right density, which is the whole point of this tool.
Which cup should I choose: US, legal, metric, or imperial?
Use US customary (236.588 ml) for American recipes; it is the default here. US legal (240 ml) shows up on nutrition labels. Metric (250 ml) is standard in Australia and many international recipes. Imperial (284.131 ml) is mostly historical in the UK. The gap between the smallest and largest is about 20 percent, so the choice is not cosmetic.
How accurate is converting cups to grams?
The math is exact; the uncertainty is in the cup itself. Published charts disagree slightly, and scooping technique moves flour weight by 15 to 30 percent. For weeknight cooking the estimate is plenty. For bread and pastry, where hydration ratios decide the outcome, convert once and then weigh everything on a kitchen scale going forward.