Bolt Circle Layout
Hole coordinates (X, Y) for a circle of N evenly spaced holes from a bolt-circle diameter, start angle, and center, plus the angular spacing and adjacent center-to-center chord (first-principles circle-of-holes trigonometry).
Audience
This tile is built for trades and the adjacent professions in the Cross-Trade Utilities group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.
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Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.