Countersink and chamfer depth calculator

How deep to go for a countersink diameter at 82, 90, 100 or 120 degrees.

For a cone of included angle θ, depth = radius ÷ tan(θ/2). The depth to the sharp point is what you program with a pointed spot drill or chamfer mill; the cone depth is what you measure below the surface. 82° is the inch flat-head screw angle, 90° the metric one.