The source of the food facts above was the USDA National Nutrient Database.
The USDA specifies rules for how each nutrient value should be rounded. The label above conforms to these guidelines.
Percent daily values
The "% Daily Values" numbers on the Orange Drink nutrition label above are based on a 2000 calorie diet. If your Daily Caloric Intake is higher or lower than 2000, you should adjust these values accordingly.
RecipeBuilder lets you to create a custom food label for all of the ingredients for a recipe. Try it here.