It depends on the size and what is in it. If you are making them yourself every 4 oz of uncooked ground turkey is 3 POINTS. I make my own turkey burgers with ground turkey and Lipton's Onion Soup mix. For a burger and a whole wheat bun I use 8 POINTS as I like a good size burger. Hope this helps you.
Edited to say: I just checked WW online and it depends on the ground turkey, 93% lean is listed as 4 oz = 4 POINTS and uncooked ground turkey is equal to 3 POINTS. I guess I am going to have to check out which kind I use!