Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Equally spaced center coordinates, counterclockwise from +x. No hole diameters, tolerances or fabrication compensation.
Example Calculation
- Pitch-circle diameter: 100 mm
- Holes: 4
- Starting angle from +x: 0 °
Pitch-circle diameter = 100 mm; Holes = 4; Starting angle from +x = 0 °. Primary result: 90.
Frequently asked questions
How do I use this calculator?
Enter pitch-circle diameter, holes, starting angle from +x. The result updates automatically. Use Reset to restore the example values.
What method does it use?
xᵢ=(D/2)cos(start+360i/n); yᵢ=(D/2)sin(start+360i/n).. Equally spaced center coordinates, counterclockwise from +x. No hole diameters, tolerances or fabrication compensation.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.