Find the miter saw angle for a corner or an equal-sided frame. Enter a corner angle, or the number of sides for a frame or ring.
Miter Saw Angle
— deg
Setting from square (0 = straight cut).Usage Tip
Measure the actual corner with an angle finder rather than assuming 90°. Cut scrap at the calculated angle, hold it in the corner, and fine-tune before cutting your real molding.
THE MATH
Miter saw angle = 90° − (corner angle ÷ 2)
For an N-sided frame: angle = 180° ÷ N
Interior angle of an N-gon = (N − 2) × 180° ÷ N
For an N-sided frame: angle = 180° ÷ N
Interior angle of an N-gon = (N − 2) × 180° ÷ N
The miter saw angle is measured from square (0° is a straight crosscut). A 90° corner needs a 45° setting; a flatter corner needs a smaller angle.
For equal-sided frames and rings, every cut is 180° ÷ N.
For equal-sided frames and rings, every cut is 180° ÷ N.
Two pieces meet at each corner and both get the same cut — an N-sided frame has 2N cuts.
Walls and corners are rarely exactly 90°; measure the real angle with a protractor or angle finder and cut test pieces first.
For crown molding the saw also needs a bevel (a compound miter) — this gives the flat miter only.
Walls and corners are rarely exactly 90°; measure the real angle with a protractor or angle finder and cut test pieces first.
For crown molding the saw also needs a bevel (a compound miter) — this gives the flat miter only.