How do I calculate the nutritional values of a recipe?
Lose It!, a free weight-loss site, has this feature. To use it I think you need to start an account. To access it, you hit the Settings tab and then select Recipes in the left-hand column. Then select "New" and follow the prompts. This calculator allows you to enter the ingredients of a dish you are preparing. Most common ingredients will pop-up in the site's list with their respective caloric values. You can also manually enter in the values if you know them or if the ingredient is not in their list. You then set the "serving size" of your dish as its total volume. Then, when you enter in the amount you are eating into your daily food log, the site automatically shows you the caloric value of your portion.

The fifth screenshot here, shows you what it looks like.