Girth is trickier.
Some take three measurements, one below the glans, one mid-shaft, and one at the base and average them. Others measure the mid-shaft and leave it at that.
Take a string or tape measure and lightly wrap it around and measure the points that touch or overlap. No need to add pressure, the measure should be of the full expansion.
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don’t have a rigid ruler
You can probably get a cheap plastic or wood 12” ruler at a dollar store.
Before: I'd like to show you something I'm very proud of, but you'll have to move real close.
After: I\'d like to show you something I\'m very proud of, but you guys in the front row will have to stand back.
God gave men both a penis and a brain, but unfortunately not enough blood supply to run both at the same time. - Robin Williams (: