Miter Angle Calculator

Calculate miter and bevel angles for corners and crown molding.

Corner Details

Corner Angle (°)

Enter the angle of the wall corner. For a standard square room, this is 90°.

Saw Settings

Cutting trim?

Enter the angle of your corner (usually 90°) to find the correct cut angle.

Overview

A miter cut creates a corner by joining two pieces of wood. For a standard flat frame, you simply divide the corner angle by 2. For crown molding, which sits at an angle, you perform a compound cut involving both miter and bevel settings.

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Pro Tips

Always measure the actual corner; walls are rarely perfectly 90 degrees.
For crown molding cut flat, use the compound miter settings. For crown molding cut 'nested', just use the standard miter setting but place the molding upside down.

Fun Facts

"A standard square corner is 90 degrees."
"An octagonal planter or frame has 135 degree interior corners, requiring 22.5 degree miter cuts."
"Crown molding 'spring angle' is typically 38° or 45°."

Formula: Miter = Corner Angle / 2

Used with this

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