Calculation

Bolt Circle

Created on · bolt-circle

Free bolt circle calculator

Calculates hole coordinates on an evenly divided bolt circle.

Pitch circle diameter

Holes

Start angle

Centre X

Centre Y

Formulas

x = x₀ + r · cos(α)y = y₀ + r · sin(α)indexing angle = 360° / count

Sources: Elementary Euclidean geometry and trigonometry.