CircleBolt Layout

Bolt circle calculator: calculate bolt circle coordinates from your diameter, count and angle inputs. CircleBolt Layout keeps your circle diameter, hole count, angles and source/output units explicit, then shows a labelled plot and readable X/Y coordinate rows.

BUILD THE PATTERN
Choose millimeters or inches for your inputs and output independently. Set the center, start angle and full-circle or stepped spacing. Inspect point index, angle, X and Y together. Changing a geometry input clears the previous result until you calculate again.

FREE TO CALCULATE
Basic coordinate calculations, a persistent working draft, coordinate text and CSV, existing saved-record access and recovery backup/import remain available in Free. No app account, ads or subscription is required.

OPTIONAL LIFETIME PRO
One optional, non-consumable purchase adds new saved layouts, history, reusable presets, layout comparisons, 0–6 decimal places, coordinate JSON and notebook CSV. Google Play displays your local one-time price before payment. Restore an existing purchase through the same Play account.

YOUR LOCAL NOTEBOOK
Keep labels, dimensions and notes on your device during normal use. Choose an Android document destination when exporting. Recovery files show a preview before import and never include purchase ownership. Export a backup before changing devices or uninstalling.

CLEAR GEOMETRY SCOPE
Angles use degrees, with 0 degrees to the right and positive angles counterclockwise. Results use floating-point geometry and display rounding. Check dimensions, units, orientation and rounding before using coordinates elsewhere. CircleBolt does not connect to machines or generate G-code, toolpaths, tolerance, manufacturing approval or safety certification.

Core calculations work offline. Google Play Billing communicates with Google for purchases, ownership and technical SDK diagnostics. Document and sharing providers handle the files you choose to send. No PatchMedia analytics or cloud notebook is provided.

Privacy: https://patch-media.com/privacy/circlebolt-layout/
Support: contact@patch-media.com

Alongside Camcut Machining Handbook, use this separate bolt circle calculator to prepare a coordinate worksheet for a manually checked workshop layout. Before transferring a row of values into your own drawing, confirm the chosen origin, angular direction and output units against the intended part.

Recent changes:
Added six interface languages and a language selector in Settings. Existing layouts, coordinate calculations and export formats are preserved.