Erection percentage

On every PE-forum people talk about percentage of erection. For example it is recommended to jelq with nothing more than 70 percent erection. Is there any pictures or video that demonstrates the different percentages of erection so you can be sure about it? Or are you supposed to estimate it yourself? Cause I am a little bit unsure when it comes to estimating my erection level.

You just have to make your best judgement. But if you want to jelq for girth, you want to be close to an erection, but still very flexible so you can feel the internal pressure increase on every jelq stroke. It’s the internal pressure increase that gives you the expansion you need for girth increases. When jelqing for length you need less fullness because you are emphasizing stretching with every jelq stroke.

I’ve been wanting to quantify this. In the rawest terms, you can start with the two ends of the spectrum. 0% is dead-cold flaccid. 100% is the absolute most erect you can be. All the middle stuff is more difficult.