Miter Angle Calculator

sides
°
°
°
Construction

Calculate miter angle for polygon frames, corner joints, and compound miters.

Formula

Polygon: miter = 90 − 180/n; Corner: miter = angle/2; Compound: tan(miter) = tan(slope) × cos(turn)
  • Polygon: for a hexagon (n=6), miter = 90 − 30 = 60°.
  • Corner: a 90° corner requires two 45° miter cuts.
  • Compound miter: set both saw tilt (miter) and blade bevel per the computed values.

Regular hexagon frame

Inputs
  • Type: polygon
  • Number of Sides: 6 sides
  • Corner Angle: 90 °
  • Slope Angle: 45 °
  • Turn Angle: 45 °

n=6 sides: miter = 90 − 180/6 = 90 − 30 = 60° per cut. Interior angle = 120°.

Frequently asked questions

How do I set the miter for a picture frame?
A rectangular picture frame has 90° corners, so each joint requires a 45° miter cut (corner mode: 90/2 = 45°).