How many cups of flour are in a 5 pound bag?

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One cup of flour equals four ounces.  With 16 ounces in one pound, you'll have four cups in one pound, or 20 cups in a five-pound bag.

However, the only way you'll get that many cups out of a five-pound bag is to measure flour correctly.  To correctly measure flour, use a spoon to lightly scoop flour out of its container into a measuring cup. Continue until the cup is overflowing. Then use the backside of a knife to level off the flour even with the top edge of the measuring cup.
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I actually measured by hand 16.66 cups for 5 lbs of flour. First I sifted the entire bag in a bowl and then I measured by each cup brushing off the cup each time with a knife. This yielded the most precise measure for me and seems to correspond accurately with some other sites. Calculations are great, but verification gives me more confidence. The bag of flour I used is from Kroger and is unbleached all-purpose enriched flour.
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That depends on how you measure.  Are you measuring sifted or presifted?

I did the math on this very subject not long ago - it came out to about 25 cents a loaf for plain bread.  Add a few cents if you are making it with oatmeal or raisins.  There is no comparison to the overpriced, overprocessed store-bought bread.
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An easier way to figure it is how many loaves can you make from a 5 lb bag?  If that's too hard, you know you can make at least 5 loaves.  Divide the price by five.   Since a 5 lb bag of flour is usually around a $1.00, that adds 20 cents to the cost of the bread.
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13.33 cups.  I just weighed one cup on a scale and did the math.   One cup on the scale weighed 6 oz.
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