Bolt Circle Calculator
Calculate equally spaced hole-center coordinates on a circle.
A QUICK WALKTHROUGH
How to use this tool
- Enter all values in the stated units.
- xᵢ=cx+(D/2)cos(θ+360i/N); yᵢ=cy+(D/2)sin(θ+360i/N), i=0…N−1. D>0; N is an integer from 1 to 360. Angle is in degrees, measured counterclockwise from +x. All lengths use the same user-chosen unit. Outputs locate centers only.
- Calculate
Formula and assumptions
xᵢ=cx+(D/2)cos(θ+360i/N); yᵢ=cy+(D/2)sin(θ+360i/N), i=0…N−1. D>0; N is an integer from 1 to 360. Angle is in degrees, measured counterclockwise from +x. All lengths use the same user-chosen unit. Outputs locate centers only.
Inputs stay in this browser.
Inputs stay in this browser.
GOOD TO KNOW
Common questions
How is the result calculated?
xᵢ=cx+(D/2)cos(θ+360i/N); yᵢ=cy+(D/2)sin(θ+360i/N), i=0…N−1. D>0; N is an integer from 1 to 360. Angle is in degrees, measured counterclockwise from +x. All lengths use the same user-chosen unit. Outputs locate centers only.