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Chamfer depth and Z offset formula

A chamfer is specified by its width and angle. When programming a chamfer mill, you need the axial depth (how deep the tool goes) and the Z-axis offset from the sharp corner. This calculator converts the chamfer specification into CNC-ready values.

• Chamfer depth = width / tan(angle) -- axial engagement of the chamfer tool
• Z-axis offset = width / sin(angle) -- distance from the sharp edge to the tool centreline
• Common angles: 45 deg (depth = width), 60 deg (depth ≈ 0.577 × width), 30 deg (depth ≈ 1.732 × width)

How to use this Chamfer Depth & Z Offset Calculator

Enter the chamfer width (flat-to-flat) and the chamfer angle. The calculator gives the axial depth of cut and the Z-axis offset. Use these values in your CAM chamfer operation or manual G-code programming.