CyberDiet.net
Cyberdiet.com is a great resource. You enter your vitals and it tells you how many calories you need to maintain, increase or lose weight. For some calculations you need to be registered.

Body Fat Distribution Chart apples and pears picture.

Target Heart Rate calculator from your age

Calories used in 72 activities from your weight and time spent.

All The Cyber Diet Assesment Tools

Diet Analysis
A little complicated, but for those who like calculator tools lets you enter the foods you've eaten for the day and then calculates the percentage of your RDAs in your intake.

Fast Food Finder
Fast Food Finder lets you look at popular fast food restaurants by name and analyze the content of 1000 popular menu items. For instance Taco BellÆs Mexican Pizza contains a whopping 570 calories, 330 of which are fat, and 36 grams of fat.

Dietetics Online ADA Networking Group

Dietsite.com
Provides an online diet and recipe analysis as well as diet, alternative nutrition and sports nutrition content.

Diettalk.com

Enhanced Calorie Calculator
Now you can keep a running list of what you ate during the day. The Enhanced Calorie Calculator tabulates the total calories eaten based on the number of servings you choose, and has a built-in tool to help you add fat grams.

Shape Up America

American Society for Clinical Nutrition

Children's Nutrition Research Center
The Children's Nutrition Research Center (CNRC) is the first federal nutrition research center to investigate the nutritional needs of children from conception through adolescence, and that of pregnant women and nursing mothers. It is one of six USDA human nutrition research centers conducting scientific investigations designed to provide Americans with a clear understanding of the role of nutrition in maintaining a healthy, active life.