Bolt Circle XY

Get the X/Y coordinates for every hole in a bolt-circle pattern without building a spreadsheet or trusting a sketch. Enter the pitch-circle diameter, hole count and start angle. Bolt Circle XY immediately calculates a clean coordinate table for layout, setup and double-checking at the machine. BUILT FOR THE JOB AT HAND • Absolute X/Y coordinates • Incremental ΔX/ΔY moves • Clockwise or counterclockwise numbering • Adjustable start angle • Center X/Y offsets • Inch and millimeter units • Adjacent and skip-one chord checks • Copyable coordinate table • Local recent setups • Visual pattern preview PRIVATE AND DEPENDABLE No account. No ads. No tracking. No network connection. Your saved setups remain on your device. Bolt Circle XY does not generate machine code. Always verify units, zero location, tool diameter and the physical setup before drilling or machining. One paid download. No subscription and no in-app purchases.