Compound Miter Angle For Crown Molding 38 Degree Spring Angle

For crown molding with a 38° spring angle sitting flat against a standard square 90° corner, the compound settings work out to a 31.62° miter and a 33.86° bevel.

Why this one specifically

38° is the traditional spring angle behind most colonial-profile crown molding — the angle the moulding's back sits away from the wall and ceiling when installed correctly, not an angle you set on the saw directly. This site converts that spring angle into the equivalent 4-sided compound-miter slope (90° minus the spring angle) and runs it through the same geometry used for a flared box, because a length of crown running around a square room corner is mechanically the same problem: four panels meeting at 90° corners, tilted away from vertical by a fixed amount.

What moves the number

This site's underlying angle math states panel slope from the horizontal (0° = a flat, unflared frame), so a 38° spring angle — itself measured from the wall — is first converted to a 52° slope (90° minus the spring angle) before the compound formula runs. Published crown charts that build their tables directly from spring angle, or that use the opposite tilt convention, will show different-looking numbers for the same physical cut, which is normal. The bevel here (33.86°) is also noticeably larger than the miter — worth noting because it's easy to swap the two settings by habit if you're used to flatter compound work like a planter box, where the miter is usually the bigger number. Confirm your molding's actual spring angle with a protractor against the installed profile before cutting; printed spec sheets for "38°" crown vary slightly by manufacturer.