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, which is why they took over hobby 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: 1/2" (12 mm) material: 1" screw 3/4" (19 mm) material: 1-1/4" screw 1" (25 mm) material: 1-1/2" 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. Below about 2" there is no room for two once the end insets are respected, so it becomes a single centered hole. Wide panels (> 12"/300 mm): every 6–8" (150–200 mm) along the joint.

Hold the end holes back from the edge. This is the part a spacing rule never tells you, and it is where a first pocket-hole project goes wrong. A pocket drilled hard against the end of a board blows out the edge, and the screw has nothing to pull against. Keep the outermost holes at least an inch from each end, or about one and a half times the material thickness on thicker stock, whichever is greater. The calculator insets the first and last holes for you and spaces the rest evenly between them.

When to Use Pocket Holes Face frames: joining rails and stiles; strongest pocket hole application. Cabinet carcass (box assembly): joining sides, bottom and top, which is 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.