You'll get all kinds of different answers from BF calculators based on the formulas you use. Some use just waist and weight, others more measurements. This is why it is generally advised you pick on (any one) and use it over time to see the trend - as long as it's down it's all good

There is a sticky in the BFL subforum on BF% and using it to determin goal weight - it might be worth a boo.

HTH
Nat