I'm guessing about 6 lbs., if you multiply the 8 week weight by 3. My little Jake weighed 1 lb. 10 oz. at 10 weeks and is 4 1/2 lbs. full grown. Jackson was a little over 2 lbs. at 10 weeks and is 6 1/2 lbs. at 9 mos.
2 lbs. is a nice healthy weight for an 8 week old yorkie.