GlenCalc

Crown molding angle calculator

For cutting crown lying flat on the saw table. The spring angle is the angle the crown sits at against the wall: usually 38° or 45° (it’s on the label).

Your answer

Miter31.62 °
Bevel33.86 °

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How we worked it out

Updated as you change the numbers.

  1. Miter = arctan(sin(spring) ÷ tan(wall ÷ 2)). Bevel = arcsin(cos(spring) × cos(wall ÷ 2)).

Method and assumptions

These are the standard compound-miter formulas for crown cut flat. For a 90° corner they give the familiar 31.62° miter and 33.86° bevel for 38° crown, and 35.26° and 30° for 45° crown. Walls are rarely exactly 90°: measure with an angle finder.

Questions

What are the saw settings for 38° crown on a 90° corner?

Miter 31.62°, bevel 33.86°.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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