Enter the diameter of the fastener (in) and the diameter of the fastener head (in) into the Calculator. The calculator will evaluate the Clearance Hole.

## Clearance Hole Formula

CH = (DF + DH) / 2

Variables:

- CH is the Clearance Hole (in)
- DF is the diameter of the fastener (in)
- DH is the diameter of the fastener head (in)

To calculate the Clearance Hole, add the diameter of the fastener and the diameter of the head, then divide by 2.

## How to Calculate Clearance Hole?

The following steps outline how to calculate the Clearance Hole.

- First, determine the diameter of the fastener (in).
- Next, determine the diameter of the fastener head (in).
- Next, gather the formula from above = CH = (DF + DH) / 2.
- Finally, calculate the Clearance Hole.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

diameter of the fastener (in) = 1.25

diameter of the fastener head (in) = 0.4