Enter the drill diameter (in) and the tip angle (degrees) into the Drill Tip Length Calculator. The calculator will evaluate the Drill Tip Length.

## Drill Tip Length Formula

The following two example problems outline the steps and information needed to calculate the Drill Tip Length.

DTL = D/2/Tan(A/2)
• Where DTL is the Drill Tip Length (in)
• D is the drill diameter (in)
• A is the tip angle (degrees)

To calculate a drill tip length, divide the diameter by 2, then divide again by the value of the tangent of half the tip angle.

## How to Calculate Drill Tip Length?

The following example problems outline how to calculate Drill Tip Length.

Example Problem #1:

1. First, determine the drill diameter (in).
• The drill diameter (in) is given as: 5.
2. Next, determine the tip angle (degrees).
• The tip angle (degrees) is provided as: 30.
3. Finally, calculate the Drill Tip Length using the equation above:

DTL = D/2/Tan(A/2)

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

DTL = 5/2/tan(15deg) = 9.33 (in)

Example Problem #2:

For this problem, the variables required are provided below:

drill diameter (in) = 6

tip angle (degrees) = 45