Drill Tip Length Calculator
Calculate the conical tip length of any drill bit based on diameter and point angle. Enter any two values to automatically compute the third.
Unit:
Calculation Result
Tip Length:
--- in
Formula & Calculation Steps
Drill Tip Length Formula
L = D ÷ (2 × tan(θ ÷ 2))
L
= Tip Length
D
= Drill Diameter
θ
= Point Angle
Alternative formulas:
Diameter = 2 × L × tan(θ ÷ 2)
Point Angle = 2 × arctan(D ÷ (2 × L))
Point Angle
Tip Length (in)
Common Use
Enter a drill diameter to see comparison values
How to Use This Calculator
1
Enter the Drill Diameter
Input the diameter of your drill bit. You can use inches, millimeters, or centimeters.
2
Enter or Select the Point Angle
Enter the tip angle in degrees, or use the quick-select buttons for common angles (118° is standard for general purpose drills).
3
View Results Instantly
The tip length calculates automatically as you type. No need to click a calculate button!
Pro Tip: You can also calculate backwards! Enter tip length and angle to find the diameter, or enter diameter and tip length to find the angle.
Common Angles: 118° (general purpose), 135° (stainless/hard materials), 90° (countersinking), 60° (center drills).
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Drill Tip Length Calculator