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Guides & tutorials

Practical, no-fluff guides to millimeter and inch conversions — written by the people who build the converter.

Dual-scale ruler showing millimeters and inches with 25.4 mm = 1 inch highlighted
Tutorial

MM to Inches: How to Convert Millimeters to Inches

The 25.4 rule, worked examples, fractional inches for tape measures, a quick chart, and the estimation tricks we actually use.