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This is a table of calibre/caliber millimetre to inch conversions for people unsure of the opposing unit of measurement for the two.

Conversion Table
Bullet Diametre in mm Diameter in Inches (0.000)
4.5mm .177 cal
5mm .196 cal (.20)
5.5mm .216 cal (.22)
6mm .236 cal (.24)
7mm .275 cal
8mm .314 cal
9mm .354 cal (.357)
10mm .393 cal (.40)
11mm .433 (.44)
11.5mm .452 (.45)
12.7mm .500 (.50)
20mm .787