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40mm = 1.575 inches.

Direct Conversion Formula
40

mm

*

1 in


25.4 mm

=

1.57480315

in

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11y ago
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Wiki User

13y ago

40mm is about 1.6 inches. So I guess you could call it a "one point six caliber" bore. But nobody would know what you're taking about. Better to just use the metric measurement on this one.

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14y ago

40 mm is 4 cm, which is about an inch and a half.

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Q: How many inches is 40 mm in diameter?
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