I'm 13 years old and I feel like my penis is a average, and I want to know what type of ruler should I use. I used a wooden ruler and it said 8 inches but the ruler you use to build said 6 inches. What should I trust.
Just compare rulers and see which one is equal in measurements to other rulers. You can measure your soft and erect penis length and width. You measure along the side of your penis that faces your stomach, not the side where your balls hang down from. You push the ruler tight against your stomach and measure out to the end of your penis along the top of your penis to get your length. You wrap a string or shoelace or rope loosely in a circle touching your penis skin all the way around the widest thickness of your penis, then measure that length of string along your ruler to get your penis circumference measurement.