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

Rise Millimeters (mm)

Required number input.

Run Millimeters (mm)

Required number input.

Bevel angle of a sloped cut from vertical rise and horizontal run in the same length unit; measured from the horizontal. 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]

Angle Degrees (°)

The resulting angle degrees 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.

• Stair Stringer Length Carpentry

  Theoretical straight stair-stringer run length from total horizontal run and vertical rise, before end cuts or overhangs.

• Crown Molding Length

  Total measured crown-molding runs and add a project-specific cut-and-waste allowance.

• Dovetail Angle

  Convert a traditional dovetail slope of one unit offset per N units depth into an angle measured from the board edge.