Miter Angle Calculator Reference Values
Calculate miter saw settings for regular polygon frames from the number of equal sides.
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Reference Value Index
This page lists 22 reference values for quick browsing and lookup.
All Reference Values
- 3-sided frame = 60° miter
- 4-sided frame = 45° miter
- 5-sided frame = 36° miter
- 6-sided frame = 30° miter
- 7-sided frame = 25.7143° miter
- 8-sided frame = 22.5° miter
- 9-sided frame = 20° miter
- 10-sided frame = 18° miter
- 11-sided frame = 16.3636° miter
- 12-sided frame = 15° miter
- 13-sided frame = 13.8462° miter
- 14-sided frame = 12.8571° miter
- 15-sided frame = 12° miter
- 16-sided frame = 11.25° miter
- 17-sided frame = 10.5882° miter
- 18-sided frame = 10° miter
- 19-sided frame = 9.4737° miter
- 20-sided frame = 9° miter
- 21-sided frame = 8.5714° miter
- 22-sided frame = 8.1818° miter
- 23-sided frame = 7.8261° miter
- 24-sided frame = 7.5° miter
Reference Table
| 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
Frequently asked questions for Miter Angle Calculator and its reference values.
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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