When it says on the back of a pack of rice that 100g of rice is equal to blah carbs, protein, etc does it mean 100g cooked or 100g uncooked?

After you cook rice etc the weight changes (sometimes 100g uncooked will be 400g cooked due to water).

I've been assuming that food labels were providing uncooked nutritional values, although my friend asked me if it was cooked or uncooked and I just couldn't be certain so I thought I would ask here.

If a food label gives nutritional information for 100g of said food, does it mean 100g cooked or 100g uncooked?

Usually it says weather thats prepared or raw values. My rice is all "raw" values for what thats worth.

mine doesn't state if it's raw or cooked (tesco brand)

Wholemeal Pasta
Name ---------------Per Serving -------------Per 100g
Energy -------------1030kJ (245 kcal) -------1370kJ (325 kcal)
Protein ------------9.4g --------------------12.5g
Carbohydrate -------46.9g--------------------62.5g
sugars -------------1.5g --------------------2.0g
Fat ----------------1.9g --------------------2.5g
saturates ----------0.4g --------------------0.5g
Fibre --------------6.8g --------------------9.0g
Sodium -------------trace -------------------trace

Unless otherwise noted, all weights on nutritional labels are uncooked, unprepared. Another way to check is to look at the serving size, at least for rice. Usually it will be a 1/3 cup. So weigh a 1/3 cup and see if you come up with close to the same amount of grams.

It would depend on the serving size, and the amount of serves per package.

ie. Quick Cook Brown Rice:

190g serving size, 5.5 servings

it's only a 500g bag, so it has to be the reconstituted amount, otherwise it would work out to be over 1kg