Answer by
LeheckaG (1826)
Depends on whose regulations, here are some common ones:
(world-wide) Darts: bulls-eye/center 5'8" or 173 cm high, oche/throw-line 7'9-1/4" or 237 cm from front
East-End/Fives/London Darts: bulls-eye/center 5'6" high, oche/throw-line 9' from front
American/East-Coast Darts: bulls-eye/center 5'3" high; throw-line 7'3", Widdy/Dart-Shark from back, A.B.D.A. from front