Free tool · Cutting & sheet goods
Crown Molding Angle Calculator
Enter the spring angle and the wall corner, and get the exact saw miter and blade bevel angles to cut crown molding lying flat on the table.
Reference: flat cuts at 38° spring
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Crown Molding Angle Calculator, explained
What miter and bevel angles do you cut crown molding at?
For the common 38 degree spring crown in a square 90 degree corner, cut it flat on the saw with the miter set to 31.6 degrees and the blade beveled to 33.9 degrees. For 45 degree spring crown in a 90 degree corner, the settings are 35.3 degrees miter and 30 degrees bevel. Those are the two settings most US trim carpenters use every day.
Crown is a compound cut: the molding sits at an angle to the wall (the spring angle), so a flat cut needs both a miter (the saw swing) and a bevel (the blade tilt). This calculator uses miter = arctan(tan(corner / 2) x sin(spring)) and bevel = arcsin(cos(corner / 2) x cos(spring)), so it works for any spring angle and any corner, not just square rooms. Inside and outside corners use the same angles, you just flip which way the piece is turned.
How it works
How the Crown Molding Angle Calculator works.
Miter = arctan( tan(corner / 2) x sin(spring) ) | Bevel = arcsin( cos(corner / 2) x cos(spring) ) - Set the spring angle of your crown. Use 38 or 45 with the chips, or type the angle stamped on the molding profile.
- Set the corner angle. Most rooms are 90 degrees; measure odd corners with a bevel gauge.
- Read the miter angle (the saw swing) and the bevel angle (the blade tilt).
- Cut the molding lying flat on the saw table, face up, with these two settings.
Example: 38 degree spring crown in a 90 degree corner cuts flat at 31.6 degrees miter and 33.9 degrees bevel. Switch the spring to 45 degrees and it becomes 35.3 degrees miter and 30 degrees bevel.
Crown Molding Angle Calculator FAQ
Crown Molding Angle Calculatorquestions.
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What angle do you cut 38 degree crown molding?
Cut flat in a 90 degree corner, 38 degree spring crown uses a 31.6 degree miter and a 33.9 degree bevel. These are the standard settings for 52/38 crown on a compound miter saw.
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What is the spring angle of crown molding?
The spring angle is the angle between the back of the crown and the wall when it is installed. The two common spring angles are 38 degrees (52/38 crown) and 45 degrees (45/45 crown). It is often stamped on the back of the molding.
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Are inside and outside corner angles different?
The miter and bevel settings are the same for an inside and an outside corner. What changes is which side of the blade the molding sits on and which way you turn the piece, so the cut faces the right direction.
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Why does crown need both a miter and a bevel?
Because the molding sits sprung away from the wall, a single flat cut cannot follow the corner. Cutting it flat on the table requires a compound angle: the miter swings the saw and the bevel tilts the blade at the same time.
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How do you find the right crown molding angle?
Crown molding sits at a spring angle against the wall and ceiling, so the cut depends on both that spring angle and the corner angle. Enter your measured corner angle and the molding's spring angle, and the calculator returns the exact miter and bevel settings. For a standard 90-degree corner the math simplifies, but odd walls need the real numbers to fit tight.
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What are the crown molding angles for 45 degrees?
A 45-degree spring angle is the symmetric case, so it splits evenly between miter and bevel. For a 90-degree inside corner you set roughly 30 degrees on the miter and 30 degrees on the bevel for a compound cut. The calculator confirms the exact figures for your saw so each face meets cleanly without gaps.
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What is a 52/38 crown molding chart?
A 52/38 chart lists saw settings for crown molding made with a 52-degree spring angle on one edge and 38 degrees on the other, the most common profile sold. The chart pairs each corner angle with its miter and bevel angle. This calculator generates those same values live, so you do not need to look up a printed chart.
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How do you cut crown molding for inside corners?
For inside corners you cut a compound miter so the bottom edge runs longer than the top, letting two pieces nest together. Measure the actual corner angle first since walls are rarely exactly 90 degrees. Enter that angle and your spring angle here to get the miter and bevel, then test on scrap before cutting your finished length.
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