Miter Angle Calculator
Calculate miter saw settings for regular polygon frames from the number of equal sides.
14-sided frame =
12.8571° miter
Representative value from the Miter Angle Calculator reference table.
Reference Values
Browse 22 reference values with individual detail pages for quick lookup.
Miter Angle Calculator
Enter the number of sides in a regular polygon frame to get miter and corner angles.
Miter Setting
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Reference Table
Use this complete table for quick lookup and internal linking to specific value pages.
| Frame Type | Miter Angle | Interior Angle | Exterior Angle |
|---|---|---|---|
| 3-sided frame | 60° miter | 60° | 120° |
| 4-sided frame | 45° miter | 90° | 90° |
| 5-sided frame | 36° miter | 108° | 72° |
| 6-sided frame | 30° miter | 120° | 60° |
| 7-sided frame | 25.7143° miter | 128.5714° | 51.4286° |
| 8-sided frame | 22.5° miter | 135° | 45° |
| 9-sided frame | 20° miter | 140° | 40° |
| 10-sided frame | 18° miter | 144° | 36° |
| 11-sided frame | 16.3636° miter | 147.2727° | 32.7273° |
| 12-sided frame | 15° miter | 150° | 30° |
| 13-sided frame | 13.8462° miter | 152.3077° | 27.6923° |
| 14-sided frame | 12.8571° miter | 154.2857° | 25.7143° |
| 15-sided frame | 12° miter | 156° | 24° |
| 16-sided frame | 11.25° miter | 157.5° | 22.5° |
| 17-sided frame | 10.5882° miter | 158.8235° | 21.1765° |
| 18-sided frame | 10° miter | 160° | 20° |
| 19-sided frame | 9.4737° miter | 161.0526° | 18.9474° |
| 20-sided frame | 9° miter | 162° | 18° |
| 21-sided frame | 8.5714° miter | 162.8571° | 17.1429° |
| 22-sided frame | 8.1818° miter | 163.6364° | 16.3636° |
| 23-sided frame | 7.8261° miter | 164.3478° | 15.6522° |
| 24-sided frame | 7.5° miter | 165° | 15° |
Frequently Asked Questions
Common questions about Miter Angle Calculator, formulas, and typical use cases.
How is miter angle calculated for a regular frame?
For an N-sided regular frame, miter angle = 180° / N, which is half of each exterior angle.
What is the difference between interior and miter angles?
Interior angle is the angle inside each corner; miter angle is the saw cut angle on each adjoining board end.
Can I use this for non-regular shapes?
No. This formula assumes all sides and corner angles are equal, as in regular polygons.
Why does a square use 45° miter cuts?
A square has four sides, so 180° ÷ 4 = 45° miter angle per piece end.
Methodology and Review
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