1 cup of king arthur all purpose flour equates to how many ounces?
King Arthur Fan in Indiana, PA
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
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?
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.
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.
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.
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
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.