Is 9mm the same as 30 cal?

Asked by Francisco Potts

You must first understand that most U.S. standard calibers are stated in inches, while metric calibers are stated in millimeters (mm). We see a lot of calibers like 5.56mm, 6.5mm, 6.8mm, 7mm, 7.62mm, 8mm, 9mm, 10mm, etc. So, a 30-caliber bullet is actually 0.30” diameter, but it’s also a 7.62mm diameter.

Gabriel Lee, BA Contributor
Gabriel Lee
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