There are about 3.8 cups in a pound of cake flour. A pound is 453.59 g, and one cup of cake flour weighs 120 g when measured spooned and levelled, so 453.59 divided by 120 gives 3.8 cups. The figure is approximate: cup weights vary with how the cup is filled, how settled the ingredient is, and the brand you buy, so if the recipe matters, weigh the cake flour on a kitchen scale instead of counting cups. For everyday cooking, 3.8 cups per pound is the number to use.
Very finely milled, low-protein flour that gives cakes a tender, fine crumb. Sponge cakes, chiffon and delicate layer cakes. That is why the cup count for cake flour is different from the cup count for other ingredients: a pound of flour fills nearly four cups, while a pound of honey fills fewer than one and a half, because a cup of honey weighs 336 g and a cup of cake flour weighs 120 g. Weight is the same for every ingredient — a pound is always 453.59 g — but volume is not, and the cup count per pound is simply the pound divided by the weight of one cup.
Pounds to cups conversion table
The table below converts pounds of cake flour to cups, using 120 g per cup (spooned and levelled). Every figure is approximate, and the gram column is exact — a pound is 453.59 g whatever you are weighing.
| Weight | Cups (approx.) | Grams |
|---|---|---|
| 0.25 lb | 0.9 cups | 113.4 g |
| 0.5 lb | 1.9 cups | 226.79 g |
| 0.75 lb | 2.8 cups | 340.19 g |
| 1 lb | 3.8 cups | 453.59 g |
| 1.5 lb | 5.7 cups | 680.38 g |
| 2 lb | 7.6 cups | 907.18 g |
| 3 lb | 11.3 cups | 1360.77 g |
| 4 lb | 15.1 cups | 1814.36 g |
| 5 lb | 18.9 cups | 2267.95 g |
| 10 lb | 37.8 cups | 4535.9 g |
For the amounts most recipes use, the useful rows are the small ones: a quarter pound is 0.9 cups, half a pound is 1.9 cups, and three quarters of a pound is 2.8 cups. If your recipe is written in pounds and your measuring tools are cups, read the cups column; if your recipe is written in cups and you buy by the pound, read it the other way — a recipe that needs 2 cups takes 0.5 lb, and a recipe that needs 3 cups takes 0.8 lb.
Cups to grams and ounces
The table below works in the other direction: cups of cake flour to grams and ounces. One cup is 120 g, which is 4.2 oz, and every other row is a multiple of that.
| Cups | Grams (approx.) | Ounces (approx.) |
|---|---|---|
| 1/4 cup | 30 g | 1.1 oz |
| 1/3 cup | 40 g | 1.4 oz |
| 1/2 cup | 60 g | 2.1 oz |
| 2/3 cup | 80 g | 2.8 oz |
| 3/4 cup | 90 g | 3.2 oz |
| 1 cup | 120 g | 4.2 oz |
| 2 cups | 240 g | 8.5 oz |
| 3 cups | 360 g | 12.7 oz |
| 4 cups | 480 g | 16.9 oz |
These are the figures to write on a recipe card. A recipe that calls for 1/2 cup needs 60 g, a recipe that calls for 2 cups needs 240 g, and a recipe that calls for 4 cups needs 480 g. Weighing removes the cup entirely: put the bowl on the scale, tare it, and pour until the display reads the gram figure. It is faster than measuring cups, it uses one less tool to wash, and it is the same every time, whatever brand of cake flour you bought.
Worked examples
A weekend loaf that needs 3 cups
A yeasted loaf that calls for 3 cups of cake flour needs 360 g. That is 0.8 lb, so a single pound bag leaves you short — you would need about 0.8 lb, and a 1 lb bag only holds 3.8 cups. Weigh the flour instead of scooping it: spoon the flour into the cup, level it with a knife, and tip it into the bowl on the scale until it reads 360 g. The difference between a spooned cup and a scooped cup can be 20 g or more per cup, and across 3 cups that is 60 g of extra flour — enough to turn a soft, open crumb into a dense, dry loaf. If you are baking with a new bag, weigh the first cup and check it against the 120 g figure before you commit the rest.
Doubling a cookie recipe
A cookie recipe written for one tray uses 2 cups of cake flour, which is 240 g. Doubled, that is 4 cups or 480 g — 1.1 lb, which is more than a single pound bag holds. This is the moment to switch to weighing: put the bowl on the scale, tare it, and pour until you reach 480 g. Cookies are forgiving about many things, but flour is not one of them; too much flour and the cookies spread less, bake thicker, and dry out. Too little and they spread into one thin sheet. A pound of cake flour is 3.8 cups, so for a doubled batch you need the pound bag plus another 0.2 cups from a second bag.
A cake where the flour has to be exact
A layer cake that needs 2 1/2 cups of cake flour needs 300 g. That is just over half a pound — 0.7 lb, to be exact. Cakes are the least forgiving bake when it comes to flour: an extra half cup can make the difference between a tender crumb and a tough one, because the flour is what sets the structure as the cake bakes. Measure by weight here, every time. If you only have cups, spoon and level carefully and never tap the cup down to settle the flour, because tapping packs it and adds weight you cannot see. One pound of cake flour gives you 3.8 cups, so a 2 1/2-cup cake uses a little over half the bag.
How the figure is worked out
The calculation is a single division. A pound is defined as 453.59 g. One cup of cake flour weighs 120 g, measured spooned and levelled from a US cup of 236.6 ml, according to King Arthur Baking. Divide the pound by the cup weight — 453.59 divided by 120 — and the answer is 3.8 cups. There is no other step, and no other number involved, which is why the figure is easy to check: if you know the grams per cup, you know the cups per pound.
The cup weight itself is where the uncertainty lives. One cup of cake flour weighs 120 g, measured spooned and levelled from a US cup of 236.6 ml. The figure comes from King Arthur Baking and carries high confidence in our table. A cup is a volume, not a weight, so anything that changes how much of the ingredient fits in that volume changes the weight: how firmly it is packed, how fine the grind is, how much moisture it has absorbed, and whether it was spooned or scooped That is why this page labels every result approximate and why a scale is the only way to be certain.
There is a dispute note on this figure worth knowing. King Arthur lists 120 g per cup; finely milled cake flour is sometimes quoted at 100 g per cup when sifted, so spoon and level rather than scooping. That is why every result on this page is labelled approximate, and why a kitchen scale is the only way to be certain when a recipe has to come out exactly right.
The spoon measures follow from the same cup weight. A cup holds 16 tablespoons, so one tablespoon of cake flour weighs 7.5 g, and one teaspoon weighs 2.5 g. The small table below gives the figures you will actually use when a recipe calls for spoonfuls rather than cups.
| Measure | Grams (approx.) |
|---|---|
| 1 teaspoon | 2.5 g |
| 1 tablespoon | 7.5 g |
| 2 tablespoons | 15 g |
| 1/4 cup | 30 g |
| 1/2 cup | 60 g |
| 1 cup | 120 g |
Practical guidance
Very finely milled, low-protein flour that gives cakes a tender, fine crumb. Sponge cakes, chiffon and delicate layer cakes. Airtight container, cool and dry, up to 1 year.
The most common mistake with cake flour is measuring it the wrong way for its form. Flour must be spooned and levelled: spoon it into the cup, level the top with a straight knife, and never scoop directly from the bag, because scooping packs the flour and adds 20 g or more per cup. Never tap the cup to settle it, and never shake it level — both pack the flour down. If a recipe was developed with weighed flour, which most professional recipes are, the cup figure is only an approximation of the gram figure, so weighing is the only way to match the recipe exactly. Keep the bag sealed between bakes, and if you buy in bulk, decant it into an airtight container so the flour stays dry and free of pantry moths.
If you do not have a scale, the cup figures on this page will get you close enough for everyday cooking, but not for precision baking. A basic digital kitchen scale costs little, weighs in grams, and removes the single biggest source of variation in baking. Until you have one, spoon and level dry ingredients, use a liquid jug for liquids, and never scoop from the bag.
Frequently asked questions
How many cups are in a pound of cake flour?
About 3.8 cups. A pound is 453.59 g, and one cup of cake flour weighs 120 g, so 453.59 divided by 120 is 3.8. The figure is approximate, because the cup weight depends on how the cup is filled — spooned and levelled gives 120 g, while a scooped cup can weigh considerably more.
How many grams are in a pound of cake flour?
453.59 g. A pound is always 453.59 g whatever the ingredient is; what changes is how many cups that weight fills. For cake flour, 453.59 g fills about 3.8 cups.
Is a pound of cake flour the same as 2 cups?
No. A pound of cake flour is about 3.8 cups, which is more than 2 cups. Two cups of cake flour weigh 240 g, which is 0.5 lb — a little under a pound. Measuring by weight avoids the error entirely.
Why does the cup count change if I scoop instead of spooning?
Because scooping packs the flour. A spooned and levelled cup of cake flour weighs 120 g, but a cup scooped straight from the bag can weigh 130 g or more — the same cup, a fifth more flour. Across a pound that means a scooped pound fills fewer cups than a spooned pound, and across a recipe it means a dry, dense result. Spoon the flour into the cup and level it with a knife, or weigh it.
How much does 1 cup of cake flour weigh in ounces?
About 4.2 oz. One cup is 120 g, and there are 28.35 g in an ounce, so 120 divided by 28.35 is 4.2. For quick reference: 1/2 cup is about 2.1 oz and 2 cups are about 8.5 oz.
Can I substitute another flour cup-for-cup?
Not safely. Every flour weighs a different amount per cup — all-purpose flour is 120 g, while cake flour is 120 g — so a cup-for-cup swap changes the weight of flour in the recipe and with it the liquid balance. Check the flour substitution guide and convert by weight: replace the grams, not the cups.