Hi Susan- I had the same problem with my cookies when I went from using measuring cups to using a scale to weigh my flour. I had always used the recipe on the Toll House chips package. So I converted the weight of the flour and concluded that a cup weighed 120g as Kye says. That is what I used as my guideline. However, what I didn't understand at the time was that the "dip and sweep" method I had used to measure my flour actually compressed the flour as I scooped it out of the package. Rather than having 120g of flour in each cup I scooped I had 151g of flour. Therefore, my cookies didn't turn out the way they always had because I just wasn't adding enough flour. I suspect that many old recipes based the volume of flour they directed us to used based on the "dip and sweep" method. I remember thinking at the time that a cup of flour should be a cup of flour regardless. Not so. It all depends on the way you get the flour into the cup. Try a little experiment -"dip and sweep" a cup of flour and then weigh your results. By the way, the "stir, dip, and sweep" method also gives different results, as does "stir, sprinkle, and sweep".

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