The smallest unit of measurement is 1/16 of an inch. When you look at a ruler and count all the lines between the 1 inch and 2 inch marks you will see that there are 16 lines all together.
A single serving of pasta is generally regarded as 2 oz. (57 g) of cooked pasta for a first course or side dish. A serving can be raised 3 to 4 oz. (85 to 113 g) if it is the only course. Occasionally a serving is approximated as 1/2 cup (114 g) of pasta; however, this depends upon the shape of the pasta.
Calories. A cup of penne pasta has the same amount of calories as most other pastas--about 200 calories. The exact amount depends on how you accurately you measure. If you pack your pasta, it will contain more in a cup than if you let it stack loosely. A more accurate way to determine calories is to weigh it. About 100 g of pasta, or about 3.5 oz, contains 141 calories, according to Nutri-Facts, which takes its information from the official nutrition database of the United States Department of Agriculture, or USDA.