Pocket Hole Spacing Calculator

What Is Pocket Hole Joinery? Pocket hole joinery uses an angled pre-drilled hole to drive a screw at an angle into the mating piece. The drill creates a counterbore (pocket) at an angle (typically 15°) and a pilot hole through the face. Invented in its modern form by Craig Sommerfeld (Kreg Tool Company, United States, 1986). Pocket screws pull the joint tight without clamps or complex setup — very popular for cabinetry and furniture.

Screw Length Selection The screw must penetrate deeply into the mating piece without breaking through the surface. Rule of thumb: screw length = 1.5 × material thickness of the mating piece (minimum). Kreg standard recommendations: 3/4" (19 mm) material: 1-1/2" screw 1/2" (12 mm) material: 1-1/4" screw 1-1/2" (38 mm) material: 2-1/2" screw Use coarse thread screws for softwood and plywood; fine thread for hardwood.

Pocket Hole Spacing For structural joints (face frames, chair rails): space every 6"–8" (150–200 mm). For long edge-to-edge glue joints (panel assembly): every 8"–12" (200–300 mm). For short rails/stiles < 4" (100 mm): 2 pocket holes, centered. Wide panels (> 12"/300 mm): every 6–8" (150–200 mm) along the joint.

When to Use Pocket Holes Face frames: joining rails and stiles; strongest pocket hole application. Cabinet carcass (box assembly): joining sides, bottom, top — fast and reliable. Table aprons to legs: works, but mortise-tenon is stronger for legged furniture. Drawer boxes: very common; use fine thread screws in hardwood drawer sides. NOT recommended: structural members under high tensile load (use mortise-tenon or dowels).

Jig Settings (Kreg) Material thickness setting: matches the thickness of the piece being drilled. Drill guide: 1/2" (12.7 mm) guide for most pocket holes. Stop collar: set based on material thickness. Clamp: pocket hole clamp keeps boards flush during driving.