Miter Joint Calculator

Calculate miter angles for polygon frames, boxes, and crown molding installations.

Miter Saw Angle Setting
--
--
Interior Angle
--
Exterior Angle
--
Piece Length (long edge)
--
Total Material Needed
--

Miter Angle Formulas

Miter Angle = 180 / Number of Sides

Interior Angle = (N - 2) x 180 / N

Common Polygon Miters

  • Square (4 sides): 45 degrees
  • Pentagon (5): 36 degrees
  • Hexagon (6): 30 degrees
  • Octagon (8): 22.5 degrees

Related Calculators

Dovetail Joint Calculator

Dovetail layout.

Box Joint Calculator

Box joint layout.

Saw Blade Calculator

Saw blade specs.

Board Foot Calculator

Board feet calculator.

Wood Glue Calculator

Glue coverage.

Mortise & Tenon Calculator

M&T joint dimensions.