There are about 8.3 cups in a kilogram of all-purpose flour — approximately, because the figure depends on how the flour is measured. One US cup of all-purpose flour weighs 120 g spooned and levelled, so 1,000 g divided by 120 g gives about 8.33 cups. That is the short answer, and the rest of this guide explains where the number comes from, how much it moves when the measuring method changes, and how to use it in real recipes — from a single cake to a bakery-scale bake.

All-purpose flour is the reference flour for this whole site: one cup weighs 120 g spooned and levelled, so a kilogram gives about 8.3 cups. That is the number every other flour on this page is measured against, and it is the figure to memorise — because once you know that a kilogram is 8.3 cups, you can scale any recipe written in grams into cups without a calculator.

Every figure on this page is labelled approximate, and for good reason: cup measurements vary with packing, moisture and the size of the pieces. When a recipe depends on the amount — a cake, a loaf of bread, a jam that has to set — weigh the ingredient on a kitchen scale instead of trusting the cup. The scale is the only measuring tool that does not care how you filled the cup.

The conversion at a glance

One cup of all-purpose flour weighs 120 g spooned and levelled. A kilogram is 1,000 g, so the arithmetic is 1,000 ÷ 120 = about 8.33 cups. The table below gives the cup equivalents for the amounts you are most likely to meet, whether you are scaling a recipe up or working out how far a bag will go. All figures are approximate, and all of them use the same 120 g per cup.

Amount Grams Cups (approx.) Tablespoons (approx.)
100 g 100 g 0.8 cups 13 tbsp
250 g 250 g 2.1 cups 33 tbsp
500 g 500 g 4.2 cups 67 tbsp
1 kg 1000 g 8.3 cups 133 tbsp
2 kg 2000 g 16.7 cups 267 tbsp
5 kg 5000 g 41.7 cups 667 tbsp

A single tablespoon of all-purpose flour weighs about 7.5 g, and a teaspoon about 2.5 g — useful when a recipe calls for a spoonful rather than a cup. Note that a kilogram is about 2.2 lb, so the same kilogram works out to about 8.3 cups by the pound route as well: the two routes agree, because they are the same arithmetic with the same density. If you buy flour in pounds rather than kilograms, one pound of all-purpose flour is about 3.8 cups.

Worked examples

A kilogram bag and a weekend of baking

A 1 kg bag of all-purpose flour is the standard supermarket size, and it covers a serious weekend of baking: a layer cake needs about 3 cups (360 g), a batch of cookies needs about 2.5 cups (300 g) and a loaf of bread needs about 4 cups (480 g) — but that already totals 9.5 cups, more than the 8.3 cups in the bag. Plan for two of the three, or buy the 1.5 kg bag. The 8.3-cup figure is what makes this planning possible before you start.

Scaling a bakery recipe down

Bakery recipes are written in kilograms, and a recipe calling for 2 kg of flour needs about 16.7 cups — but a home baker making a quarter of it needs 500 g, which is about 4.2 cups. Weigh the flour if you can: a quarter of a bakery recipe measured by cups can be off by a full cup if the flour is scooped rather than spooned, and a sponge cake does not forgive that. If you must use cups, spoon and level every one.

A pantry stocktake

A kilogram of flour is about 8.3 cups, and a household that bakes once a week uses roughly a kilogram a month. A 5 kg sack is about 41.7 cups — five months of weekly baking — and it is far cheaper per cup than the 1 kg bag. Store the sack in an airtight container rather than the paper bag it came in: flour absorbs moisture and odours from the cupboard, and a 5 kg sack left open goes stale long before it is used up.

How the figure is measured

The headline figure comes from the CookScale ingredient table, which lists all-purpose flour at 120 g per US cup (236.6 ml), spooned and levelled, sourced from King Arthur Baking with high confidence. The standard white wheat flour for most baking, milled from a blend of hard and soft wheat. The table's uses for all-purpose flour are: Cakes, cookies, breads, pastry and sauces.

A note on disputed figures: Flour weight is the most disputed conversion in baking: King Arthur lists 120 g per cup spooned and levelled, while other sources quote 125 g, 130 g and up to 142 g for a scooped cup. We use the King Arthur spooned-and-levelled value as primary.

The method matters more than most people realise. Spooned and levelled is the standard for this ingredient, and a different method gives a different weight: scooping instead of spooning compresses dry ingredients and can add 10–20% to the weight of a cup, while packing a sticky ingredient can add even more. That is why this guide states the method alongside every figure, and why the headline number is always labelled approximate. If you measure differently from the stated method, expect a different result — and if the recipe matters, weigh the ingredient instead.

One practical consequence: never convert in the wrong direction by accident. To go from cups to grams, multiply the cups by 120. To go from grams to cups, divide the grams by 120. To go from kilograms to cups, divide the grams (1,000 per kilogram) by 120. Keep the 120 g figure in mind and the rest is simple division — but always check the result against a scale when the bake depends on it.

Practical guidance

The mistake is scooping flour straight from the bag with the measuring cup. A scooped cup of all-purpose flour can weigh 140 g or more against 120 g spooned and levelled — and in a kilogram that is the difference between 8.3 cups and 7.1 cups. Over a whole recipe, scooping adds a cup of flour that was never meant to be there, and the cake turns dry and heavy. Spoon the flour into the cup and level it with a knife, every single time.

Storage: Airtight container in a cool, dry place for up to 1 year. Weighing the ingredient before you store it, and writing the weight on the container, saves a conversion later: a tub labelled '450 g' tells you instantly that it holds about 8.3 cups, without any measuring at all.

When you do not have a scale: use the cup, but use it carefully. Spoon the ingredient into a dry measuring cup — never scoop from the bag — and level the top with the back of a knife without tapping or shaking the cup. For sticky or wet ingredients, use a liquid measuring jug and read the level at eye height, or lightly oil the cup so the ingredient releases cleanly. Accept that the result will be approximate, and if the recipe is a cake, a loaf or a jam, borrow a scale: it is the single most useful tool in baking, and it costs less than a bag of the flour it measures.

Frequently asked questions

How many cups are in 1 kg of all-purpose flour?

About 8.3 cups. One cup of all-purpose flour weighs 120 g spooned and levelled, and a kilogram is 1,000 g, so 1,000 divided by 120 gives about 8.3 cups. A 500 g bag is about 4.2 cups, a 1.5 kg bag about 12.5 cups and a 5 kg sack about 41.7 cups. These figures assume the flour is spooned and levelled — scooped flour weighs more per cup, so a kilogram gives fewer cups.

Why do some sources say a cup of flour weighs 125 g or 130 g?

Because the published figures disagree, and this is the most disputed conversion in baking. King Arthur Baking lists 120 g per cup spooned and levelled, while other sources quote 125 g, 130 g and up to 142 g for a scooped cup. The difference is the measuring method, not the flour: scooping compresses the flour and a cup holds more. This site uses the King Arthur spooned-and-levelled figure of 120 g as its primary value.

Can I use cups instead of a scale for flour?

You can, but a scale is more accurate and faster once you are used to it. A cup of flour can vary by 20 g depending on how it is measured, and in a cake that variation is the difference between tender and tough. If you must use cups, spoon the flour into the cup and level it with a straight edge — never scoop, never tap the cup to settle it, and never pack it down.

Should I weigh all-purpose flour or measure it in cups?

Weigh it whenever the recipe matters. One cup of all-purpose flour weighs 120 g spooned and levelled, but that figure assumes the stated method — and in practice, cups vary by 10–20% depending on how they are filled. A kitchen scale removes that variation entirely: 120 g is one cup, every time, regardless of who is measuring. Cups are fine for soups, salads and smoothies, where a little more or less makes no difference. For baking, jam, bread and anything where the ratio of ingredients decides the outcome, the scale is the right tool.

How accurate is the about 8.3 cups figure?

It is accurate to about plus or minus half a cup per kilogram, which is roughly the variation you get from different measuring methods and different batches of the ingredient. The figure is calculated from a single sourced density — 120 g per cup from King Arthur Baking, high confidence — and the arithmetic is exact: 1,000 ÷ 120 = 8.33 cups. The uncertainty is not in the maths but in the cup itself: a scooped cup weighs more than a spooned cup, and a packed cup weighs more than a loose one. Treat 8.3 cups as a planning figure and verify with a scale when it matters.

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