Erect girth vs semi erect girth

My penis has a bigger girth when semi erect than when fully erect. Is this normal?

Sometimes its the plumpness of the unextended skin that causes extra girth.
Because the skin isn’t stretched with a full erection you have ‘bundled’ skin (though it may look normal, just fat).

This is what I think from my experience anyway.

HTH

Yep I agree with that. It has happened to me a few times, it will go away after a while. Don’t worry about it.

You are experiencing the “sacrifice length for girth” conundrum. You experience a swollen appearance during partial engorgement that is greater in girth than a full-on erection. Your erectile appearance can change quite dramatically depending on characteristics that are present during engorgement. For example, you can arouse quickly and rigidity takes over and shuts down the inflow of blood prematurely which does not allow for your maximum size to flourish.

There are techniques that can help you overcome these physiological factors. Creating excessive stretched skin through hanging is one technique that allows for that swollen “fat boy” appearance to take over during a full erection. Hanging with partial erections induces higher pressures to expand tissues and promote larger erections. Edging during these exercises, also helps the “pumping” equipment during an erection.

Yes, its normal.