Compound miter angles
Find miter and bevel settings for crown molding laid flat or a tapered regular box. Change the inputs to update the chart or diagram.
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The editable example is illustrative. Enter your own dimensions, operating data, prices, and fees. Results update as you edit.
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How it works
- M = atan(sin() / tan(/2)); B = asin(cos() × cos(/2)); = ; =
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Your result
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Assumptions and limitations
Spring angle is measured from the wall; box tilt is measured from vertical. Results are angle magnitudes for ideal geometry. Saw orientation, inside/outside corners and left/right cuts require the machine’s instructions and scrap tests. Example: a 90° corner and 38° spring give 31.62° miter and 33.86° bevel.
Sources
- Bosch — crown molding and compound miter settings Sources reviewed: 2026-10-22
