This miter cut calculator finds the angle to cut each piece for a clean corner joint. Enter the corner angle above to get the miter cut angle for frames, trim, and molding.
Formula
Miter cut angle = Corner angle ÷ 2
Example
For a 90° corner, cut each piece at 45°. For a 6-sided frame (120° corners), cut at 60°.
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Frequently Asked Questions
How do I calculate a miter angle?
Divide the corner angle by two. A 90-degree corner needs a 45-degree miter on each piece.
What miter angle for a hexagon frame?
Each interior corner is 120 degrees, so cut each piece at 60 degrees.
Why cut both pieces at half the angle?
The two matching miter cuts add up to the full corner angle for a tight joint.