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King Arthur All Purpose Flour


1 cup of king arthur all purpose flour equates to how many ounces?

King Arthur Fan in Indiana, PA

badge posted by: cynthiacardiello on January 11, 2011 at 2:08 pm in Baking, misc.
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reply by: KAF_Keri on January 11, 2011 at 3:21 pm

KAF Fan,

One cup of our all purpose flour equals 4.25 ounces. We have a handy weight chart for many common ingredients here:


The flours are under the letter k for King Arthur flours.

~Keri @ KAF

reply by: JenniferEvans2009 on January 11, 2011 at 9:34 pm

Depends on who you talk to and who made the recipe. The fine folks at KAF really do use 4.25 ounces (120 grams) per cup in their recipes.

But do NOT assume that every recipe out there is like that.

I usually use 130 grams per cup (about 4.75 ounces) when not using a KAF recipe.

reply by: cwcdesign on January 12, 2011 at 8:24 am

I follow KAF's advice and use 4.25 ounces, but I was reading a Cook's Illustrated recipe and it indicated 5 ounces per cup of flour. Can anyone address why the difference?

reply by: Mike Nolan on January 12, 2011 at 9:15 am
Mike Nolan

Assuming it isn't because they're calling for a different type of flour (bread flour vs AP, etc), it has to do with how they measure out the flour, some ways of measuring it will compact the flour more than others.

As long as you know how much flour by weight (directly or indirectly via cups) the author intended, you should be OK.

But you may need to adjust the amount of flour or moisture in the dough anyway, for reasons other than the cups/weight issue.

reply by: dwighttsharpe on January 12, 2011 at 10:07 am

It's merely that the way Cook's Illustrated has chosen to measure flour is the scoop and level method. This, they have decided(and from their experience) results in 5 ounces of flour.
They have also assigned that 5 ounce value to a cup of whole wheat flour.

As explained earlier(or maybe not), instead of scooping the flour with the measuring cup, sprinkles the flour into the measuring cup. This results in 4.25 ounces for AP flour. Other flours, may have different weights; eg, WW cup is 4 oz, rye flour 3.625 oz, and so on.

reply by: pjh on January 12, 2011 at 10:54 am

Check out our video on measuring flour. As Mike says, there are different ways to measure, and none is "right" or "wrong" - it all depends on how the recipe developer did it. Here at King Arthur we "sprinkle and sweep," as you'll see in the video.

reply by: JenniferEvans2009 on January 13, 2011 at 11:10 pm

This is why you weigh ingredients. 4.25 ounces = 4.25 ounces every time, while a cup could mean anything from 4.25 to 5 ounces. It's the volume methods that are wacky, not the weights.

reply by: vibeguy on January 14, 2011 at 8:02 pm

This is why you have to read the parts of a cookbook that aren't sexy, violent or brightly illustrated. Better ones will discuss their measurement method.

I assume 4.75 for typical cookbooks. The CI 5.0 is insane, but at least they publish weights.

reply by: MMPhilc on March 16, 2014 at 4:27 pm

All-Purpose Flour: 1 cup = 4.5 oz
Bread Flour: 1 cup = 4.8 oz
Cake Flour: 1 cup = 3.9 oz
Pastry Flour: 1 cup = 4.25 oz
Whole Wheat Flour: 1 cup = 4.25 oz
(Source: http://allrecipes.com/howto/baking-ingredient-conversions/)

reply by: cwcdesign on March 16, 2014 at 8:12 pm

MMPhilc - King Arthur uses 4.25 ounces per cup for their all purpose flour and their recipes. It depends on who is writing the recipe.