Nutritional Labelling

An Australian website's Nutrition Panel Calculator is very helpful:-
http://www.foodstandards.gov.au/industry/npc/Pages/Nutrition-Panel-Calculator-introduction.aspx

Also if you look at Scobies Direct have made nutrition labels generate from their system for every recipe on ScobiesDirect . See http://www.scobiesdirect.com/Recipes/RecipeSearch/ViewRecipes.asp

There is a program called Nutricalc, and McCance and Widdowson are a source of nutritional values.