Depends on the size. If you go to the store and the package weight is 1 lb, and contains 2 chicken breasts (which is standard size at my store), each is 8 oz. A boneless, skinless chicken breast that is 8 oz is 250 calories. Basically, without knowing package size and total weight it is impossible to know calories.
Generally, I figure my chicken breasts at 30 calories per ounce of weight. So lets say I purchased a package of 2 chicken breasts at the store with a total weight of 1.5 lbs. There are 16 oz per pound, so the total package was 24 oz. If I ate an entire breast from that package, it would be half the total weight, or 12 oz. at 30 calories per ounce, a 12 oz chicken breast would be 360 calories total.
Once you know the key facts - number of breasts per package, total weight of package, and the 30 cals per ounce and 16 oz per lb, you can calculate the calories in each breast fairly easily.
Hope that helps!
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