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Exact conversion is 1" = 25.4mm = 2.54 cm

For 'estimating' 25 mm per inch, or 2 1/2 cm per inch.

For small measurements
1mm = 0.03937" (1/25.4 would be exact, and there are a bunch more decimal places)

Guesstimating/Estimating around the shop -- 1mm approx 0.040 (40 thou)
 
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