Bolt pattern is also otherwise known as bolt circle. It is defined as the diameter of an imaginary circle formed by the centres of the wheel lugs which can be calculated using an online bolt pattern calculator. Bolt patterns can be 4-, 5-, 6-, or 8-lug holes. A bolt circle of 4x100 would indicate a 4-lug pattern on a circle with a diameter of 100mm. Given here is an online bolt circle calculator to calculate bolt pattern for the angle of holes and its respective X and Y co-ordinates.
If the number of holes is 4, each bolt is of diameter 4 and hole is of 5, the angle of first hole from 00 is 30 and the offset is (1,2), then calculate bolt pattern or bolt circle.
Angle of first hole = 30
Angle of second hole = 30 + 120
Angle of third hole = 150 + 120
B = 360 / 3 = 120
X-coordinate of First Hole = 2.7321
Y Coordinate of First Hole = 3
X-coordinate of Second Hole = 0
Y Coordinate of Second Hole = 3.7321
X-coordinate of Third Hole = -0.7321
Y Coordinate of Third Hole = 1
X-coordinate of Fourth Hole = 2
Y Coordinate of Fourth Hole = 0.2679