I am working on converting all my recipes to weight measurements so I can determine the food costs of my items. Does anyone have any resources websites, books ect that have been helpful to you in this process? All of my current recipes are measured in cups ect. and I prefer to use grams but ounces will also work fine.

I have found this chart helpful.
US measurement to Grams
http://www.gourmetsleuth.com/cookingconversions.asp?Action=find
Product  Grams/ tsp.  Grams/T
(4 T=¼ C)  Grams/ ¼ C  Grams/ 1/3 C  Grams/½ C  Grams/ 1 cup
Baking powder, double acting   4.6   13.8         
Baking soda   4.6   13.8        
All-Purpose Flour  2.6   7.81  32  43  65  129
Cake Flour  2.41  7.25  29  39  59  117
Flour, whole wheat   2.5  7.5  30   39.96   60   120
Cornstarch  2.67   8   32      
Cocoa  1.79   5.4   21.5  28.66   43   86
Sugar, brown   4.6  13.8  51  68  102  220
Sugar, granulated   4.2  12.6  53  71  106  200
Sugar, powdered (unsifted)   2.5  8   30   39.96   60   120
Sugar, Powdered Sifted  2.08  6.25  25   33.3   50   100
Unsalted Butter  4.73   14.19   57  76  114  227
Vegetable Shortening  4.27   12.81   51.25   67.65   102.5   205
Milk 1 %  5.08   15.25   61  81.25  122  244
Heavy Cream  5  15  59.5  79.25  119  238
Water  4.75  14.25  57  76  115  229
Peanut Butter   5.38   16.12   64.5  85.91  129  258
Honey  7.06  21.19  84.75  112.89  169.5  339
Corn syrup  6.83  20.5  82  109.22  164  328
Salt  6  18        
Vanilla  4.33  13        
Chocolate chips  3.79  11.37  45.5  60  91  182

I use http://www.onlineconversion.com/ to convert all of my recipes.

Here's my favorite
http://www.onlineconversion.com/weight_volume_cooking.htm

It has lots of choices and takes various foods and densities into account.