### Trying to convert cups of flour to ounces. Which one of these is correct ?

I've volunteered to make cupcakes for a friend's wedding this weekend. The person coordinating this gave me a recipe from Cooks Illustrated that calls for:

1 1/2 cups unbleached all-purpose flour (7 1/2 ounces)

I have to make five batches of this and wanted to find how much flour I need to buy. In using my kitchen converter calculator I noticed the amounts seems off and decided to try converting 1 1/2 cups AP flour to ounces just to verify and it gave me 6 2/3 ounces as the conversion.

So is it 7 1/2 ounces or 6 2/3 ounces? Should I just stick to measuring by cups? I normally wouldn't worry so much but since it is for a wedding I wanted to be as accurate as possible. I tried searching for the recipe but Cooks Illustrated wants my email address for a "14 day trial" and I am not falling for that.

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1. Go with 7 1/2 ounces. One cup of flour is 5 ounces. Since I started weighing instead of measuring ingredients, I haven't had a single baking failure.

Not necessarily. King Arthur Flour (who oughta know) use 4.25 oz. as their standard for AP flour, and of course, different types of flour (bread, whole wheat, cake, etc.) don't all weigh the same:

http://www.kingarthurflour.com/recipe...

I've used both 4.25 and 5 oz. as the equivalent of a cup, and I find 4.25 almost always works better.

2. I don't understand why you must convert to cups to determine the weight of flour to buy. If you need 7.5 oz per batch, then 5 batches would be 7.5 x 5, or 37.5 oz. That's more than two, but less than 3, pounds. So that's how much flour to buy. Do be sure to use unbleached flour as the recipe recommends.

If you'll be weighing the flour when baking, there's nothing to worry about. Use the amount the recipe specifies. If you'll be measuring with cups, there IS something to worry about. CI uses the dip-and-sweep method of measuring, and you should, too -- Dip the measuring cup into a bin of flour, then sweep across the top with a straight edge (a butter knife or icing spatula) to level the flour.

Good luck!