Use this workshop calculation to turn measured dimensions and the selected construction convention into a cut, spacing, fit, or material-planning value.

Regular polygon sides

Required integer input.

Find each saw miter angle from a square cut for a regular polygon frame with equal sides and interior angles. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Each miter from square (°)

The resulting each miter from square returned as a number.

• Nominal dimensions, kerf, moisture movement, hardware clearances, wall squareness, and manufacturer instructions can change the required shop dimension. Measure the actual assembly and test critical joints on scrap before cutting finished material.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Complement the calculated dimension with a physical story stick, dry fit, or full-size layout. Follow the hardware, coating, adhesive, or machine manufacturer's limits where they differ from a rule of thumb.

• Miter Angle

  Set equal miter angles for two pieces meeting at a measured inside corner; output is saw rotation away from a square cut.

• Gehrungswinkel Fuer Unregelmaessiges Eck

  Equal miter-saw angle for two pieces meeting at a measured non-square included corner; each piece receives half the corner angle.

• Baseboard Miter Inside

  Equal miter angle for each of two baseboard pieces meeting at a measured inside corner; assumes a symmetric joint.