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When to Use This Calculator

Use the Crown Moulding Angle Calculator when cutting crown moulding on a compound miter saw, especially for inside or outside corners that may not be exactly 90 degrees. Crown moulding sits at an angle between the wall and ceiling — called the spring angle — which means you cannot simply cut it at 45 degrees like flat trim. The required miter and bevel settings depend on both the corner angle and the spring angle of your specific moulding profile.

How It Works

Enter the spring angle of your moulding (how far it tilts from the wall) and the wall corner angle, and the calculator instantly provides the exact miter angle and bevel angle to dial in on your saw. This eliminates the trial-and-error approach that wastes expensive moulding stock and produces poor-fitting joints that require excessive caulking to look acceptable.

Tips for Best Results

• The most common spring angle is 38 degrees (also labeled 38/52 crown). Measure yours by holding a short piece of crown in position against a framing square — the distance from the wall to the flat back edge determines the angle.
• For corners that are not exactly 90 degrees, use an angle finder tool to measure the actual corner before entering values. Older homes and hand-framed walls are rarely perfectly square.
• Always make test cuts on scrap pieces before cutting your finish stock — even with exact angles, saw calibration can introduce small errors that matter on tight-fitting joints.
• Mark the top and bottom edges of each piece before cutting so you do not accidentally flip the moulding and cut the wrong compound angle. Crown can be confusing to orient on the saw.