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Well, 3.42" is already in inches. If fractional helps, 3.42 is just under 3 and 7/16.

Hi Robert and welcome. 3.42 inches is 8.6868 centimeters. 3.42 inches is .08 of an inch from 3 and a half inches. Cheers and stay safe!

I'll keep it simple. It's just under 1/2 an inch.

27/64 to be exact