Sugar Cups to Grams: Granulated, Brown, and Powdered Conversion Guide

Why a Cup of Sugar Isn't a Fixed Weight

When a recipe calls for a cup of sugar, the weight in grams depends entirely on which sugar you reach for. Granulated, brown, and powdered sugar each have different densities because of how they are processed and milled. A cup of each will not weigh the same, even though the volume is identical.

Granulated sugar consists of uniform, relatively large crystals that pack with air gaps between them. Brown sugar is the same crystal but coated in molasses, which makes the grains stick together and settle more densely. Powdered sugar is ground to a fine dust and mixed with a small amount of cornstarch, so it takes up more volume per gram than either of the other two.

This difference matters in baking, where sugar affects not just sweetness but also moisture, browning, and structure. Using the wrong weight can change a cookie's spread or a cake's crumb. The conversions below reflect standard US measuring cups and the most common commercial sugar products.

Granulated Sugar: The 200-Gram Baseline

Granulated white sugar is the standard against which most recipes are written. One US cup of granulated sugar weighs 200 grams. This is the figure you will see in most professional baking references, and it holds for standard white sugar crystals that have not been ground finer or coarsened.

For recipes that call for granulated sugar by volume, use 200 grams per cup as your baseline. This works for measuring by spooning sugar into a cup and leveling it off. If you scoop directly with the measuring cup, you may pack in slightly more, but granulated sugar's free-flowing crystals make the difference small enough that most recipes tolerate it.

When scaling a recipe, remember that the conversion is linear: 1/4 cup is 50 grams, 2/3 cup is 133 grams, and 3/4 cup is 150 grams. For very precise work, such as candy making or meringues, weigh your sugar instead of measuring by volume.

Brown Sugar: Packed Versus Loose Changes Everything

Brown sugar is the trickiest of the three because it is almost always measured packed. A firmly packed cup of brown sugar weighs 220 grams. If you scoop it loosely without pressing, you might get only 180 grams or less, which can noticeably affect your dough's moisture content.

The molasses coating makes brown sugar clump, so a 'packed' measurement means pressing it into the cup with the back of a spoon until it holds the cup's shape when turned out. Recipes that call for brown sugar usually mean packed unless they explicitly say 'loosely packed' or 'lightly packed.'

Because brown sugar is denser than granulated, substituting it by volume rather than weight will change your recipe. If you swap brown for white cup-for-cup, you are adding more sugar by weight and more moisture from the molasses. When substituting, weigh both sugars to keep the total sugar mass consistent.

Powdered Sugar: Sifted or Unsifted Matters

Powdered sugar, also called confectioners' sugar, weighs far less per cup than granulated because it is ground into a fine powder that traps air. One cup of unsifted powdered sugar weighs about 120 grams. If you sift it first, the weight drops to roughly 100 grams per cup because sifting introduces even more air.

Most recipes that call for powdered sugar mean unsifted, spooned into the cup and leveled. Sifting is usually done after measuring, to remove lumps before adding to frostings or glazes. If a recipe specifically says 'sifted powdered sugar,' it means sift first, then measure, which gives you the lighter 100-gram cup.

Powdered sugar also contains about 3% cornstarch by weight, added to prevent caking. This means you cannot use it as a direct substitute for granulated sugar in baking, because the cornstarch changes how it behaves in batters. For dusting and icings, however, the weight conversion is straightforward.

Practical Checklist for Accurate Sugar Measurement

Getting accurate sugar weights in grams comes down to a few repeatable habits. The checklist below covers the most common sources of error and what to do about each one. Following it will keep your conversions consistent across different sugar types and recipes.

The single most reliable approach is to use a digital kitchen scale and measure by grams directly. If you must use cups, at least be consistent about how you fill them for each sugar type. A scale removes the guesswork entirely and is the standard in professional kitchens.

• Use a digital scale for any recipe where sugar is a major ingredient, like meringues, caramels, or macarons - weigh directly in grams instead of cups.
• For granulated sugar, spoon it into the cup and level with a flat edge; do not pack or tap the cup, as tapping settles the crystals.
• For brown sugar, press it firmly into the cup so it holds the cup's shape when tipped out - this is the 'packed' measurement recipes assume.
• For powdered sugar, spoon it gently into the cup without shaking, then level; do not sift before measuring unless the recipe says so.
• If a recipe gives both cup and gram amounts, trust the gram figure - it is the more precise of the two.
• When substituting one sugar for another, convert by weight, not by cup, to keep the total sugar mass the same.

Common Conversions for Quick Reference

For everyday baking, it helps to have the most common conversions memorized or posted on the fridge. The table below covers the cup amounts most frequently called for in recipes, with weights for all three sugar types. Use it as a quick lookup when you are scaling a recipe up or down.

Remember that these figures are for standard US measuring cups (240 ml). If you are using metric measuring cups from other countries, the volumes differ slightly and the weights will not match. Stick to one system per recipe to avoid errors.