If you are standing in the kitchen with a 1 kg pack of powdered sugar and a recipe that calls for cups, here is the number: about 8.85 cups. One cup of powdered sugar weighs 113 g spooned and levelled on the King Arthur Baking figures, and 1,000 g divided by 113 g is 8.85. The rest of this guide shows the same conversion at other weights, works through real recipes, and explains the method behind the number so you can trust it — and know where it can drift.

Powdered Sugar is granulated sugar ground to a fine powder with a little cornstarch. It is used for icings, glazes, dusting and buttercream. That is why the kilogram-to-cups question comes up so often: powdered sugar is sold by weight in most countries, while many recipes — especially American ones — measure it in cups. This page converts the whole kilogram, not just a single cup, so you can plan a whole bag or tub against a recipe instead of converting one spoonful at a time.

Conversion table: kilograms of powdered sugar to cups

One US cup is 236.6 ml, and one cup of powdered sugar weighs 113 g spooned and levelled. Every row below is that cup weight divided into the weight shown, so the whole table follows from a single number. Figures are rounded to two decimal places and labelled approximate.

Weight Cups (approx.)
100 g 0.88
250 g 2.21
500 g 4.42
750 g 6.64
1 kg (1,000 g) 8.85
1.5 kg (1,500 g) 13.27
2 kg (2,000 g) 17.7

The same cup weight works in the other direction too:

Measure Weight (approx.)
1 cup 113 g
1 tablespoon 7.1 g
1 teaspoon 2.35 g
1 kg in tablespoons about 142 tbsp

If you only need part of the kilogram, the table above is the fastest way to read it off. Half a kilogram is 4.42 cups, a quarter is 2.21 cups, and 100 g — a common recipe amount — is 0.88 cups.

How the figure is worked out

The calculation is a single division: 1,000 g ÷ 113 g per cup = 8.85 cups. The only input is the weight of one cup of powdered sugar, and that comes from King Arthur Baking, which lists one US cup of powdered sugar at 113 g, spooned and levelled. The confidence rating on that figure is high, which means it is a published, checked value rather than an estimate — but it is still a cup measurement, and cups are never as exact as grams.

One thing to know before you use the number: King Arthur lists 113 g unsifted; sifted powdered sugar is about 100 g per cup because sifting adds air.

Spooned and levelled means spooning powdered sugar loosely into the cup and sweeping the top flat with a knife, never scooping the cup through the bag. Scooping packs the ingredient down and can add 10–20% to the weight, which is exactly how a recipe ends up with too much of something and nobody knows why.

That is also why every number here carries the word approximate. A cup is a volume measure being used as a stand-in for weight, and the two only line up when the filling method matches the published one. If the dish is forgiving — a stew, a marinade, a crumble topping — the cup figure is plenty. If it is a cake, a loaf of bread, or anything where a 10% error changes the texture, weigh the ingredient on a kitchen scale and skip the cups entirely.

Worked examples

The table is useful, but recipes do not come in kilograms. Here are three ordinary situations where the kilogram-to-cups figure does real work.

Example 1 — a cake from a 1 kg bag

A sponge cake calls for 2 cups of powdered sugar. Two cups weigh 226 g, so from a 1 kg bag you use just over a third of it and have about 6.85 cups left — enough for a second, smaller bake. If you are making the same cake again next weekend, one bag covers roughly 4.4 two-cup cakes before it runs out.

Example 2 — doubling a cookie batch

Your cookie recipe uses 1½ cups of powdered sugar (169.5 g) and you want to double it for a school bake sale. Doubled, that is 3 cups, or 339 g — about 34% of a kilogram bag. Weighing 339 g straight from the bag is faster and more accurate than scooping three cups, and you still have 5.85 cups in reserve.

Example 3 — a glaze measured in grams

A glaze recipe lists 100 g of powdered sugar rather than cups. That is 0.88 cups — just over half a cup, or about 14.2 tablespoons. Measuring the glaze by weight avoids the common mistake of packing a cup too firmly and ending up with a glaze that sets too sweet and too thick.

Measuring it well, and storing what is left

The most common mistake with powdered sugar is the packing question. Spooned and levelled is the method behind every figure here, and changing the method changes the weight. A cup scooped hard from the bag can weigh 10–20% more than a spooned-and-levelled cup, which in a cake means a sweeter, denser crumb and a bake that browns too fast. The second mistake is measuring over the mixing bowl: spill a little extra in and there is no way to take it back. Measure over the bag or a plate instead.

Storage matters once you have opened a kilogram pack. Airtight container, cool and dry, indefinitely. A kilogram is a lot of powdered sugar for a home kitchen — for most households it will last weeks or months — so decanting it into a sealed container on the day you open it is worth doing: it keeps the weight stable, keeps moisture out, and means the cup you measure in a month weighs the same as the cup you measure today.

Without a scale, tablespoons are the fallback: one kilogram of powdered sugar is about 142 level tablespoons, and one cup is 16 tablespoons, so you can build any amount in the table above from spoonfuls. It is slower than weighing, and each spoonful adds its own small error, but for soups, marinades, and everyday cooking it is close enough. For baking, borrow or buy a scale — it is the single cheapest upgrade to a home baker's accuracy.

Buying it by the kilogram

Shops sell powdered sugar by weight, and the kilogram is the standard pack size in most countries outside the United States. Knowing that the pack holds about 8.85 cups lets you compare it honestly against smaller packs: a 500 g pack is 4.42 cups, so if the kilogram costs less than twice the 500 g price, it is the better buy — provided you will use it before it goes stale. For powdered sugar, icings, glazes, dusting and buttercream. Work out how many cups your household actually uses in a month before choosing the big pack; a bargain that ends up thrown away is not a bargain. And remember the figure is approximate: if the recipe on the packet is written in grams, follow the grams. Cups are a translation, not the original.

Frequently asked questions

How many cups are in 1 kg of powdered sugar?

About 8.85 cups. One cup of powdered sugar weighs 113 g spooned and levelled (King Arthur Baking), and 1,000 g ÷ 113 g = 8.85 cups. The figure is approximate, because how firmly the cup is filled changes the weight slightly.

How many cups are in 500 g of powdered sugar?

About 4.42 cups — half the kilogram figure. The same division applies: 500 g ÷ 113 g per cup = 4.42 cups. The conversion table near the top of the page lists 100 g, 250 g, 750 g, 1.5 kg, and 2 kg as well.

How many tablespoons are in 1 kg of powdered sugar?

About 142 level tablespoons. One tablespoon of powdered sugar weighs 7.1 g, so 1,000 g divided by that is 142 spoonfuls. Tablespoons are a workable fallback when there is no scale, but each spoonful adds a little error, so weigh when it matters.

Can I use the same cups-per-kilogram figure for other brands of powdered sugar?

Usually, yes, within a small margin. The cup weight of a standard ingredient is set by its density, which barely changes between brands. What does change it is the form — fine versus coarse, sifted versus settled, softened versus fridge-hard — so if a brand feels noticeably lighter or denser in the hand, weigh a cup of it once and use your own figure.

Why do different sources give different cup weights for powdered sugar?

King Arthur lists 113 g unsifted; sifted powdered sugar is about 100 g per cup because sifting adds air. This page uses the primary published figure and states it plainly, so you can adjust if your recipe book uses a different one.

Related conversions

More conversions for powdered sugar, and the tools that do this arithmetic for you: