Miter Angle Calculator
Miter angle depends on the corner and the trim mode. The working compound miter calculator handles ordinary flat trim plus crown molding laid flat with both miter and bevel settings.
Flat trim
For baseboard, casing and flat trim, the bevel is zero and the miter is half of the corner supplement.
miter = (180 - corner_angle) / 2
Crown molding on flat
For crown molding laid flat, the calculator uses corner angle and spring angle to return both saw miter and bevel settings.
Cut orientation
The calculator returns angle magnitudes. Left/right piece, keeper side, blade tilt and inside/outside setup still need a scrap test on the actual saw.
Frequently asked questions
Can I use this for baseboard?
Yes. Choose flat trim/baseboard mode on the working calculator for a zero-bevel miter result.
Can I use this for crown molding?
Yes. Choose crown molding laid flat and enter the crown spring angle to get miter and bevel settings.
Related pages
- Compound miter calculator - working crown and flat-trim angle calculator.
- Trim molding calculator - linear feet, waste and stock pieces.
- Rafter calculator - adjacent sloped-member layout geometry.
- Stair stringer calculator - rise, run and angle layout.
- Cut list calculator - linear stock cuts after angle layout.