Crown Molding Angle Calculator
Calculate compound miter and bevel settings for crown molding laid flat.
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What this tool does
Calculate compound miter and bevel settings for crown molding laid flat. Angles are in degrees. Settings are magnitudes; left/right direction depends on the corner and saw orientation.
How to use the Crown Molding Angle Calculator
- Enter or select wall corner angle (degrees).
- Enter or select molding spring angle (degrees).
- Read the calculated result; change any measurement to compare alternatives.
Formula
miter=atan(sin(spring)/tan(corner/2)); bevel=asin(cos(spring)×cos(corner/2))
- corner
- Wall corner angle (degrees)
- spring
- Molding spring angle (degrees)
Angles are in degrees. Settings are magnitudes; left/right direction depends on the corner and saw orientation.
Worked example
For crown molding angle calculator, the following measurements illustrate the exact method: Wall corner angle (degrees): 90; Molding spring angle (degrees): 38.
Inputs
- Wall corner angle (degrees)90
- Molding spring angle (degrees)38
Result
- Miter setting (degrees)31.62
- Bevel setting (degrees)33.86
Results explained
- Miter setting (degrees)
- Miter setting (degrees) from the formula above. Angles are in degrees. Settings are magnitudes; left/right direction depends on the corner and saw orientation.
- Bevel setting (degrees)
- Bevel setting (degrees) from the formula above. Angles are in degrees. Settings are magnitudes; left/right direction depends on the corner and saw orientation.
Frequently asked questions
Use the wall corner and spring angle in the compound trig formulas shown above.
Use actual measured thickness and width unless your supplier explicitly prices on nominal rough dimensions. A nominal 2 × 4 is typically 1.5 × 3.5 inches after surfacing.
No unless a waste input is shown. Add stock for end trimming, defects and kerf rather than treating the computed total as a guaranteed cut plan.
Length inputs with a unit can be switched to metric; internal formulas keep a consistent inch/foot basis. Board foot outputs remain board feet.
A 38° spring angle at a 90° corner produces approximately 31.62° miter and 33.86° bevel. Test offcuts before cutting finished stock.