Quick Linear Distance Conversion Technique
Master a fast method to convert linear distances easily and accurately for everyday use and various applications.
Written by Michael Cone
Updated at March 13th, 2026
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Table of Contents
Quick reference linear distance anchors to memorize
| Inches | Thou | mm | µm |
|---|---|---|---|
| 0.001" | 1 | 0.025 | 25 |
| 0.004" | 4 | 0.1 | 100 |
| 0.010" | 10 | 0.254 | 254 |
| 0.040" | 40 | 1.0 | 1000 |
The 4 thou = 0.1 mm anchor is probably the most useful one to internalize for metrology work.