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Geometry

Chamfer and Countersink Calculator

Solve ideal conical geometry using the included angle, small diameter, and either large diameter or axial depth.

LOCAL CALC / CHAMFER
NO DATA SENT

INPUT

Enter values

OUTPUT

READY

Enter known values and calculate.

Results stay on this device.
Shop-floor check

Confirm whether the drawing specifies included angle or angle per side. Verify tool geometry and inspect the actual feature; small depth errors can create large diameter changes.

01 / METHOD

How to use this calculator

  1. Choose whether to solve for depth or large diameter.
  2. Enter the small diameter, known geometry, and included angle.
  3. Calculate using consistent length units.

02 / APPLICATION

Where it helps

  • Setting countersink depth
  • Estimating chamfer diameter from Z depth
  • Checking print geometry

03 / BOUNDARIES

Assumptions and limitations

Assumes

  • Straight, sharp conical surface
  • Angle is the full included angle
  • Diameters share one axis

Does not cover

  • Tool tip flats and corner radii are excluded
  • Measured depths depend on reference surface
  • Does not account for runout or tool wear

04 / QUESTIONS

Frequently asked questions

Is a 90° countersink entered as 90 or 45?

Enter 90°. This calculator asks for the full included angle and internally uses its half angle.

Can I use inches or millimetres?

Yes. Use any one consistent length unit for every diameter and depth; the result uses that same unit.

Why does the measured diameter differ?

Tool runout, tip flats, corner radii, surface burrs, angle error, and the depth reference can all shift the real result.