Wheat, whole wheat and other grain-based pastas all contain approximately the same amount of calories: 100 calories per half-cup, cooked. If you don't have a measuring cup, try to serve a portion about the size of a tennis ball.
Calories
The USDA My Pyramid serving size for wheat pasta is a 1/2 cup cooked or 1 oz., which provides approximately 100 calories. Most packages of pasta, however, list the serving size as 2 oz., which contains approximately 200 calories and yields about 1 cup, cooked.
Varieties
If you are trying to increase your consumption of whole grains, look for products that list "whole wheat flour" as the first ingredient. These products also contain 100 calories per 1/2 cup serving, but provide more nutrients and fiber than refined wheat pasta. The USDA recommends consuming at least half of your daily grain servings as whole grains.
Tips
A 1/2 cup serving may seem small, especially when you're very hungry. To make your meal more filling, prepare pasta the way many Italians and Asians do: with lots of low-calorie vegetables. This will add color, flavor and texture as well satisfying bulk.