Calculate miter and bevel angles for picture frames, crown molding, and polygon joints.
Miter Angle Calculator turns the geometry of a corner into cut settings for two matching pieces. Supply the finished corner or polygon information and, for compound work such as crown molding, the molding's installed tilt. The result separates miter rotation from blade bevel. The frequent mistake is reading the finished corner angle as if it were the saw setting. A symmetric joint bisects the corner geometry, while tilted molding requires two coordinated angles and a clearly understood zero reference.
A concrete input and expected output from the current implementation.
Input
Flat, equal two-piece frame joint; finished corner angle: 90 degrees
Expected output
Miter angle: 45 degrees per piece; bevel angle: 0 degrees
Two identical cuts divide the 90-degree corner equally: 90 / 2 = 45 degrees. Because both frame pieces remain in the same plane, the cut requires no bevel.
For a flat symmetric joint, the shared cut face lies on the corner's angle bisector. The face-to-edge angle is half the included interior angle. A saw calibrated with 0 degrees at a square crosscut instead uses half the exterior turn. For a regular n-sided frame, that saw rotation is 180/n degrees; a hexagon therefore uses 30 degrees at each end.
Crown molding cut flat needs a compound setup because its installed face is tilted relative to the saw table. The corner angle and spring or tilt angle define the required cut plane. The calculator expresses that plane as miter, the table rotation, and bevel, the blade tilt. Both values apply together; changing either one changes the resulting joint.
Not on a saw whose miter scale reads 0 degrees for a square crosscut. The cut face bisects the 120-degree interior angle, so it lies 60 degrees from each piece's long edge. That is only 30 degrees away from a square crosscut. If a drawing uses face-to-edge angle instead, it will label the same geometry 60 degrees; verify the calculator's convention before cutting.
Not automatically. Values calculated for crown molding laid flat describe table rotation and blade tilt for that orientation. When molding is nested at its installed spring angle, the setup is different and commonly uses zero blade bevel. Use only the cutting orientation identified by the calculator. If flat versus nested is not identified, do not transfer the values without checking a scrap joint.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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