Miter Finder

Two surfaces of different thickness cannot be joined with the same angle on both sides. Enter the two pitches and thicknesses to get the two real edge angles.

Examples
Surface A left in the drawing
Leaving the edge it
Surface B right in the drawing
Leaving the edge it

Thickness is unit‑free — only the ratio of the two matters for the angles. Both pitches are measured from horizontal.

Surface A —
Surface B —

Measured at the top edge, from the top face (looking away from the edge) to the cut face. 90° is perpendicular to the top face; below 90° the bottom edge moves in towards the middle of that surface, above 90° it is undercut past the edge.

Material angle at the edge
—
Width of the cut face
—
Equal-angle cut, for comparison
—