# Bolt Pattern Calculator

The diameter of the imaginary circles formed by the center of wheel lugs is called as the bolt circle or pattern. This online calculator is used to find the positions of the bolt circle pattern based on the number of holes, angle of 1st hole, diameter of 1st hole, offset, diameter of hole and bolt circle.

The diameter of the imaginary circles formed by the center of wheel lugs is called as the bolt circle or pattern. This online calculator is used to find the positions of the bolt circle pattern based on the number of holes, angle of 1st hole, diameter of 1st hole, offset, diameter of hole and bolt circle.

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#### Example

**If the number of holes is 3, each bolt is of diameter 3 and hole is of 5, the angle of first hole from 0**^{0} is 25^{0} and the offset is (1,2), then

Angle of first hole = 25^{0}

Angle of second hole = 25+ 120 = 145^{0}

Angle of third hole = 145+ 120 = 265^{0}

B = 360 / 3 = 120^{0}

X-coordinate of First Hole = cos ( ( ( 1 - 1 ) * 120 + 25 ) ) * 1.5 + 1
= 2.3595

X-coordinate of Second Hole =cos ( ( ( 2 - 1 ) * 120 + 25 ) ) * 1.5 + 1
= -0.2287

X-coordinate of Third Hole = cos ( ( ( 3 - 1 ) * 120 + 25 )) * 1.5 + 1
= 0.8693

Y Coordinate of First Hole = sin ( ( ( 1 - 1 ) * 120 + 25 ) ) * 1.5 + 2
= 2.6339

Y Coordinate of Second Hole = sin ( ( ( 2 - 1 ) * 120 + 25 )) * 1.5 + 2
= 2.8604

Y Coordinate of Third Hole = sin ( ( ( 1 - 1 ) * 120 + 25 ) ) * 1.5 + 2
= 0.5057