Miter Angle Calculator
Calculate miter angles, bevel angles, and compound miter settings for any corner. Includes presets for common polygons and crown molding spring angles.
Common Presets
Results
Corner Angle
90.0°
between pieces
Miter Angle (each piece)
45.00°
saw miter setting
Complementary Angle
45.00°
90° − miter
Bevel Angle
0.0°
blade tilt (flat miter)
How to Use This Calculator
Choose your input method: enter a corner angle directly, specify the number of polygon sides, or select crown molding mode. For simple miters, the calculator splits the corner angle to find the saw miter setting. For crown molding, enter the wall corner angle and spring angle to get compound miter and bevel settings for your saw.
Formula Used
Miter Angle = (180 - Corner Angle) / 2. For a regular polygon: Corner Angle = (N - 2) x 180 / N. Crown Molding Miter = arctan(sin(spring) / tan(corner / 2)). Crown Bevel = arcsin(cos(spring) x cos(corner / 2)).
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Disclaimer
This calculator is for estimation purposes only. Results may vary based on local conditions, materials, and building codes. Always consult a licensed professional before making decisions based on these calculations. MyContractorTools is not responsible for any errors or omissions.