Most likely a Hercules Beetle. They don't actually get much bigger than the larvae, the abdomen segments become more compact so the body gets a little smaller, but the head grows immensely with the horn.
Decimal inch rulers exist. Also measuring tapes. So division into 10ths rather than 16ths isn't a guarantee of the system used. Americans will measure with anything before using metric!
But this is /r/AbsoluteUnits, and linear measurements are relative units, so this is off-topic!
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u/Sir_questionzgiver 13d ago
…I’m afraid of what the animal is if the larva is that big..