Old LOI Calculator - Industrial Marking Equipment

Numberall Technical Utility

Length of Impression Calculator

Check whether a type-holder or numbering-head character sequence fits the available marking space on your part.

Length of impression is the measured span of the stamped character sequence or wheel positions — not the full holder body, numbering-head frame, shank, fixture, or part clearance.

1 Choose layout type

2 Enter character size and positions

3 Compare length of impression to available marking space

Enter layout details

Use this tool for mechanically controlled layouts: type holders and numbering heads. It is not intended for manually spaced individual hand stamps.

How does your character sequence behave?

Fixed code or repeated text Part number, lot code, fixed word, or repeated sequence. Serial number changes every part High-production consecutive serializing. Only the last digit changes Quick-change numbering where the final wheel changes often. The last two digits change Quick-change numbering where the final two wheels change. Many positions change randomly Frequent random code changes across the sequence. One character at a time on tags Manual tag, nameplate, badge, or small flat-part marking.

Core layout inputs

Character height

Only valid sizes for the selected calculation path will be used.

Number of characters

For numbering heads, this is treated as number of wheels.

Part surface

Choose round if the impression will follow the outside surface of a cylindrical part.

Available marking space

Physical width or length where the stamped impression must fit.

Units

Linear entries are inches or millimeters. Angular coverage is entered in degrees.

Optional: enter the text or code to preview

Use this if you know the exact part number, serial format, lot code, or fixed text. If left blank, the calculator will create a sample sequence based on the number of positions.

Optional: add application review context

Material

Clearance around impression area

These details do not change the length-of-impression calculation, but they may affect whether Numberall recommends layout review or a sample stamp.