What is the best method to estimate 1-oz serving size of nuts?

The best method to estimate a 1-ounce serving size of nuts is to use a kitchen scale for accuracy, as one ounce typically translates to about 28 grams. If a scale isn't available, you can estimate that a 1-ounce serving of whole nuts is roughly equivalent to a small handful or about 24 almonds, 18 cashews, or 14 walnut halves. Another practical approach is to use standard measuring cups, where 1 ounce of nuts is approximately 1/4 cup.