Sugar Weight Converter

A Cup of Sugar Runs From 113 g to 228 g

The Sugar Weight Converter turns cups of any sugar into precise grams and ounces, because a cup of sugar is rarely a single fixed weight.

Reach for "a cup of sugar" and the number on the scale depends entirely on which sugar you mean. A cup of confectioners' sugar weighs about 113 g, while a cup of sparkling sugar tips past 220 g — close to double the mass for the same volume. Granulated white sugar, the one most recipes assume, sits at roughly 198 g. That spread is why a bake built on one sugar can drift sweet, dry, or oddly pale when measured as if it were another. This tool keeps a separate King Arthur weight for each sugar rather than leaning on one average, so the gram figure matches what is actually in your bag. For flour, cocoa, and the wider pantry, the broader cups-to-grams converter for every ingredient covers the rest, you can do the same for flour, type by type against its own chart, and butter converts by the stick, cup, or gram.

The sugar cups to grams question splits along two lines: how fine the crystal is, and whether the sugar is measured loose or packed. Powdered sugar is pulverised and full of air, so it weighs little; coarse demerara and sparkling sugars are dense, heavy crystals; and brown sugar is pressed firmly into the cup by convention, which loads more grams into the same space. The table below lists every sugar this converter covers, its King Arthur reference weight per US cup, whether it is measured packed or loose, and where each one belongs in the kitchen.

The jump from 113 g to 228 g per cup is the whole argument for a sugar-specific tool. An icing recipe that assumes a generic 198 g per cup of sugar nearly doubles the powdered sugar it should use, while the same generic figure under-weighs a packed cup of brown sugar by 15 g. External references disagree on the same sugar, too: King Arthur lists granulated at 198 g a cup — the figure this site uses everywhere, the general converter included — while FAO and USDA data lands nearer 200. The gap is small for white sugar, but it widens fast once powdered and packed sugars enter the recipe, and a scale is the only way to settle it. For the concept underneath every one of these weights, the full picture of how ingredient density works explains why the same cup rarely lands on the same number twice.

Why Brown Sugar Is Measured Packed

The single biggest source of error with sugar is not the type but the convention: brown sugar is measured packed. Almost every recipe that calls for brown sugar means a cup pressed firmly down with the back of a spoon, because the molasses coating each crystal makes the sugar clump and trap air. Spoon it in loosely and the cup holds far less; press it in and it holds King Arthur's 213 g. The same "1 cup" can swing by a large margin depending only on how hard you pack it.

• Packed (brown sugars): firmly pressed into the cup until it holds the shape when tipped out. King Arthur's 213 g figure for light and dark brown sugar assumes this.
• Loose (every other sugar): spooned or poured in and levelled, never pressed. Granulated, caster, and the coarse sugars are all measured this way.

This is sugar's version of the measuring problem that dogs flour, where scooping packs a cup heavier than spooning. The fix is the same: a scale removes the question entirely, so weighing brown sugar to 213 g a cup turns "packed" from a judgement call into a number. Because the molasses is what makes brown sugar brown, the same understanding feeds into how you swap the sugar for honey, maple, or brown when the recipe and the cupboard disagree.

The Coarse, Heavy Sugars

At the dense end of the table sit the large-crystal sugars: turbinado, demerara, and the sparkling sugar used for decoration. These are heavy not because they are packed but because their big, hard crystals leave little air between them, so a cup carries more mass than the fine white sugars do. Demerara reaches 220 g a cup and sparkling sugar 228 g, both above granulated, even though they pour loosely. They are usually sprinkled rather than measured by the cupful, but when a recipe does call for a quantity, using granulated's weight would shortchange it.

The fine sugars cluster in the middle. Caster, or superfine, sugar is just granulated milled smaller, so at 190 g a cup it is a touch lighter than the 198 g of standard granulated. The two are close enough to swap by weight in most recipes, which is why a sponge or a meringue works equally well from either once you weigh rather than scoop.

How the Converter Works

Pick a sugar, enter an amount, and choose the unit you are starting from — US cups, tablespoons, grams, or ounces. The converter routes everything through grams using the selected sugar's weight, then reports grams, ounces, and the equivalent volume, so it runs in both directions. Going from a weight back to cups answers the everyday "I have 200 g of sugar, how many cups is that?" without any arithmetic. When a whole recipe needs resizing rather than a single ingredient, the tool to resize the whole recipe in one step handles the multiplier, and once the sugar is a known weight you can express the sugar as a baker's percentage alongside the flour.

The ounces shown are weight ounces, not fluid ounces: a cup of granulated sugar is 198 g, which is about 7 oz on a scale. Tablespoons divide the cup figure by sixteen, so one tablespoon of granulated sugar is roughly 12 g — small, but enough to matter when a recipe leans on several.

Where Sugar Weight Really Counts

Weighing pays off most where the sugar does structural work, not just sweetening. Icings and buttercreams are the clearest case: powdered sugar is so light that a cup measured by eye can be 20 g out, enough to leave a frosting too loose or too stiff, and the fix is to weigh to 113 g a cup. Cookies are the other: their chew and spread depend on the brown sugar being properly packed, so weighing to 213 g guarantees the amount the recipe was written around. The broader case for leaving the cup behind is laid out in the case for the scale over the cup, which walks through the variance with its own data.

For everyday creaming — butter and granulated sugar for a cake — the tolerance is wider, and a cup either way rarely shows. It is the powdered and packed sugars, the two extremes of the table, that punish guesswork hardest, and they are exactly the ones a scale makes effortless.

Key Terms

Density

The mass of a substance per unit volume, usually given here as grams per cup. For sugar it depends on crystal size and on whether the sugar is packed: fine powdered sugar is light, coarse demerara is dense, and packed brown sugar carries more grams than its loose volume would suggest.

Packed Measure

The convention of pressing brown sugar firmly into a measuring cup before levelling, so it holds the cup's shape when turned out. Recipes calling for brown sugar assume a packed cup unless they say otherwise, which is why King Arthur weighs a packed cup at 213 g rather than the lighter weight a loose spoonful would give.

Confectioners' Sugar

Granulated sugar ground to a fine powder with a small amount of cornstarch added to prevent caking, also sold as powdered or icing sugar. The fine grind traps air, so a cup weighs only about 113 g — far less than granulated — and sifting it lightens the cup further still.