Enter the bolt diameter (in) and the threads per inch into the Bolt Area Calculator. The calculator will evaluate the Bolt Area.

## Bolt Area Formula

The following two example problems outline the steps and information needed to calculate the Bolt Area.

BA = .7854*[D-(.9734/n)]^2
• Where BA is the Bolt Area (in^2)
• D is the bolt diameter (in)
• n is the threads per inch

To calculate bolt area, subtract the value of .9374 divided by threads per inch from the bolt diameter, square the result, then multiply by .7854.

## How to Calculate Bolt Area?

The following example problems outline how to calculate Bolt Area.

Example Problem #1:

1. First, determine the bolt diameter (in).
• The bolt diameter (in) is given as: 3.
2. Next, determine the threads per inch.
• The threads per inch is provided as: 2.
3. Finally, calculate the Bolt Area using the equation above:

BA = .7854*[D-(.9734/n)]^2

The values provided above are inserted into the equation below and computed.

BA = .7854*[3-(.9734/2)]^2 = 4.96 (in^2)

Example Problem #2:

For this problem, the variables required are provided below:

bolt diameter (in) = 4