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Drill point length formula

The drill point length is the axial distance from the drill tip to the full diameter. It determines how deep you must drill past the required hole depth to achieve a full-diameter hole bottom.

• Point length Lp = (D / 2) / tan(A / 2)
• D = drill diameter, A = point angle (typically 118° or 135°)
• Web thickness ≈ D × 0.18 (for standard carbide drills)

How to use this Drill Point Length Calculator

Enter the drill diameter and point angle. The calculator gives the point length to add to your drilling depth and the approximate web thickness for reference. For through-holes, add point length + 2 mm clearance.