Pen Blank Calculator

Blank dimensions for pen kit mandrel and tube.

Tube outer diameter (mm)

Tube length (in)

Finished pen diameter (in)

Number of barrels

Board thickness (in)

Tab to move between fields

Min blank cross-section (in)

0.63

Blank length per barrel (in)

2.23

Total blank length (in)4.45

Drill bit size (mm)7

Drill bit size (in)0.28

Min wall thickness (in)0.11

Blanks per 5" stick2

Blanks From Thickness1

Waste Vol0.4

How to Use This Calculator

Enter Tube outer diameter (mm), Tube length (in), and Finished pen diameter (in).
Set Number of barrels and Board thickness (in).
Review Min blank cross-section (in) and Blank length per barrel (in).
Use Total blank length (in) and Drill bit size (mm) to inform your decision.

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