Miter Angle Calculator
Calculate precise miter angles for perfect corners in woodworking, picture framing, crown molding, and construction projects. Determine the correct cutting angles for any joint configuration.
Step 1: Joint Configuration
Understanding Miter Angles
For a standard corner, the miter angle is half the corner angle. For a 90° corner, this equals 45°. For polygons, divide the total angle by the number of pieces.
Step 2: Advanced Settings
About Compound Miters
Compound miters involve both miter and bevel angles, commonly used for crown molding installed at an angle to the wall. The spring angle is the angle between the wall and the molding back.
Miter Angle Results
Required Miter Angle
Cutting Instructions
Set your miter saw to 45.0°. For each piece, cut at this angle, making sure all cuts face the same direction. For a perfect joint, both pieces should be cut at exactly the same angle.
Regular Polygon Miter Angles
| Polygon Shape | Sides | Corner Angle | Miter Angle |
|---|
Angle Visualization
Miter Angle Formula
Miter Angle = Corner Angle ÷ (2 × Number of Pieces)
For compound miters: Miter Angle = arctan(sin(Corner Angle) ÷ (2 × sin(Spring Angle)))
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