Bolt Circle Calculator
Result
Bolt Circle Calculator Lay out evenly spaced holes on a bolt circle. Enter the bolt circle diameter, number of holes, and starting angle to get the spacing between holes and the X–Y coordinates of each hole from the center. — free online calculator.
Formula
- Bolt Circle Calculator calculates its result from D, Theta0, Periods, Interest / Current. It uses the formula Hole i: X = (D/2) × cos(θ₀ + i × 360/n), Y = (D/2) × sin(θ₀ + i × 360/n); chord = D × sin(180°/n). Change any input to recalculate the result instantly.
- The main inputs are D, Theta0, Periods, Interest / Current. Enter them in the units and format shown in the calculator.
- Keep measurements and project assumptions consistent before comparing or combining values.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Bolt Circle
- D: 2
- Theta0: 3
- Periods: 4
- Interest / Current: 5
Using D = 2, Theta0 = 3, Periods = 4, Interest / Current = 5, the calculated result is 1.7018070491.
Sample result: Calculating…
Frequently asked questions
What does the Bolt Circle calculate?
Bolt Circle Calculator Lay out evenly spaced holes on a bolt circle. Enter the bolt circle diameter, number of holes, and starting angle to get the spacing between holes and the X–Y coordinates of each hole from the center. — free online calculator.
Which values should I enter?
Enter D, Theta0, Periods, Interest / Current using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Hole i: X = (D/2) × cos(θ₀ + i × 360/n), Y = (D/2) × sin(θ₀ + i × 360/n); chord = D × sin(180°/n).
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.