There are approximately two to three raisins in one gram, depending on the size of the raisins. There are approximately 60 raisins in a 1-ounce (28 grams) serving. The most accurate method for measuring raisins is to use a digital food scale that provides results in grams.
The typical U.S. serving size for raisins is 1.5 ounces (43 grams). Each serving contains 129 calories, 34 grams of carbohydrates, 25 grams of sugar and 1 gram of protein. Raisins, which are fat- and cholesterol-free, are a good source of iron, vitamin B6 and potassium, copper and manganese. Commercially produced raisins, grown from seedless grapes, may be dried by leaving the grapes on the vine to dry naturally or by laying the grapes on large trays in the vineyard rows.