[1] Frame?
[2] Tension?
[3] FB? or Mains? or Crosses? 1 piece or 2 piece? [1 piece wastes at least 18" to 24" less string]
[4] Stringing machine?
Even if you provide the info, it will be an educated guess. You will always have wastage because you always throw away the string between the last tieoffs and the gripper.