Layout Calculator
The Layout Calculator helps you determine ball drilling layouts for your students. Start with a spec sheet, choose a calculation method, and generate precise layout measurements — all with the student's bowling style factored in.
Spec Sheet
Before calculating a layout, you need a spec sheet for the student. The spec sheet captures their personal measurements:
- PAP (Positive Axis Point) — the horizontal and vertical distance from the center of the grip to the bowler's PAP.
- Grip Type — conventional, fingertip, or semi-fingertip.
- Inserts & Slugs — whether the bowler uses finger inserts, thumb slugs, or both.
Spec sheets are saved per student, so you only need to measure once. If a student is linked via the Bowling app, their spec sheet data may auto-fill from their profile.
Calculation Methods
The Layout Calculator supports four calculation methods. Choose the one that matches your preferred layout system:
Dual Angle
The most widely used layout method. You set the drilling angle and VAL angle to control ball motion shape. Higher drilling angles create earlier roll; lower angles create more length and backend.
PAL (Pin-to-Axis-Line)
A simpler method that uses the distance from the pin to the bowler's axis line. Shorter distances create earlier roll; longer distances create more length.
Two LS (Two Layout System)
Uses two measurements — pin-to-PAP distance and the mass bias or CG relationship — to determine the layout.
Symmetrical
For symmetrical core balls. Positions the pin relative to the PAP using a single distance measurement and angle.
Style Presets
To speed things up, the calculator includes style presets that set recommended starting values based on the bowler's throwing style:
- Stroker — lower rev rate, more axis rotation. Presets favor layouts that add backend reaction.
- Cranker — high rev rate, high tilt. Presets favor layouts that control the backend and create earlier roll.
- Tweener — moderate rev rate and tilt. Presets provide a balanced starting point.
Tip
Style presets are starting points, not final answers. Always adjust based on the specific ball, lane conditions, and student feedback.
Student Context Auto-Fill
When you select a student in the Layout Calculator, their spec sheet data (PAP, grip, style) automatically fills into the form. This saves time and ensures consistency across layouts you calculate for the same student.
Saving & Sharing Layouts
After calculating a layout, you can:
- Save — store the layout in the student's profile for future reference.
- Share — send the layout details to a pro shop or directly to the student. The shared format includes all measurements and a visual diagram.