Calculate Miter Cut Angle

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Cutting outside corners

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What happens here

Once the actual corner angle is measured, a simple calculation is used to determine the correct miter cut angle for each piece of trim. The formula is: (180 degrees - actual_corner_angle) / 2. For example, if the measured angle is 88.65 degrees (rounded to 89 degrees), the calculation becomes (180 - 89) / 2 = 91 / 2 = 45.5 degrees. This calculated value (45.5 degrees in this example) will be the setting for the miter saw.

Goal: Determine the precise miter saw setting for each trim piece

Tools and materials

Pencil — Writing down calculations

What they say

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automatically cut 245s assuming this corner is a perfect 90. But before I cut anything, I'm going to check the actual angle. This corner is 88.65. So, 88.65 I'm going to round it to 89. So, we're going to do 180 - 89 = 91. 91 / 2 = 45 1/2. This 45 1/2 is going to be our miter cut. Mark your baseboard. Keep the back tight against your fence. Line the cut up with your short point.

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