Why Does the Oil Pattern Change Your Target?
Bowling lanes are coated with oil to control friction, and the length of that oil pattern determines when your ball starts to hook. On a longer pattern (41-43 ft), the ball skids further before friction takes hold, so the hook doesn't start until close to the pins. On these lanes, you need to target further inside (a lower board number) to build enough angle for the ball to enter the pocket properly. On a shorter pattern (32-36 ft), the ball meets friction earlier and hooks sooner, so playing further outside (a higher board number) with a straighter shot is the safer choice.
The ball's own hook potential matters too. A ball with strong hook potential (a high-performance coverstock) curves plenty on its own, so it can still reach the pocket even when aimed further outside. A straighter ball (a low-performance coverstock) doesn't hook much by itself, so you need to target further inside to manufacture a bigger entry angle and keep good pin action.
This calculator uses an empirical formula based on an average adult league bowler. In practice, your optimal target keeps shifting with ball weight, your personal release style, and changing lane conditions as oil transitions during a game, so treat the board number here as a starting point and adjust based on how your shots actually play out.
Frequently Asked Questions
A longer oil pattern gives the ball more distance to skid, so the hook starts later. Targeting further inside (a lower board number) creates enough angle for the ball to hook near the pins.
A ball with strong hook potential curves a lot on its own, so it can reach the pocket even with a smaller angle, letting you target further outside (a higher board number).
For a right-handed bowler, board 1 starts at the right gutter and numbers increase toward the center of the lane, up to board 39. It's mirrored for left-handed bowlers.