Calculate miter saw settings for corners and polygons
3 = triangle, 4 = square, 6 = hexagon, 8 = octagon
Always perform a test cut on scrap wood before cutting your final material. Even a 0.5° error can leave a visible gap in a corner.
Crown molding requires both a miter and a bevel angle if cut flat. This calculator is for standard vertical miters.
Ensure your saw is square to the fence and the blade is 90° to the table before trusting the built-in scales.
A miter angle is the saw blade angle needed to cut a piece so it joins perfectly with another piece at a corner. For a 90° corner, you cut each piece at 45° (miter angle).
The formula is simple: Miter Angle = Corner Angle ÷ 2. For non-standard corners or polygons, this calculator helps you find the exact angle to set on your miter saw.
Project: Building an 8-sided frame (octagon)
Input: 8 sides
Result: Miter angle = 22.5° (each corner angle is 135°)
Enter the actual corner angle. Obtuse corners (>90°) produce smaller miter angles.
No, crown molding requires both miter and bevel angles if cut flat. This calculator handles 2D miters only.
Even small angle errors (0.5°) create visible gaps. Always test cut on scrap first.
The angle on the opposite side of the cut. For a 45° miter, the complementary is also 45°.
Most miter saws are accurate to ±0.5°. Check calibration with a quality square.
Bevel is the tilt of the blade from vertical. Miter is the rotation left-right. Different concepts.
Yes, as long as the stock is shorter than your saw's blade capacity. Thick stock may require slow feeds.
Yes. Stop blocks ensure consistent piece lengths and improve accuracy and safety.
Disclaimer: Miter angles calculated by this tool are theoretical. Actual saw settings depend on your specific saw's calibration and accuracy. Always test cut on scrap material before cutting your final workpiece. Saw calibration can affect results—ensure your miter saw is square to the fence and blade is 90° to the table. This calculator is for planning purposes only and should not be relied upon as your sole source for critical cuts. Professional woodworkers should verify all angles with a quality protractor or angle finder.
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