Dude You are awesome. Sorry for my late reply, I thought I would get notifications if you post anything. I measured my own head by putting my head in between a sliding door. but I will also try to make the caliper you just posted for better measurementS for both the helmet and my head. So do you think I should return the hjc rpha 11 Carbon until I find a better fit helmet with your help? I dont have much more days for the return window. i really was hoping that I would keep it specially due to its weight being so light. my current helmet is shoei QWEST (i believe it is for round heads) and its not a good fit at all, i bought it 5 years ago when i did not have any knowledge of head shape. but I think i can live with it a bit longer until I find the right helmet, since having a comfortable helmet is my only reason for buying a new one. By the way I always wear a bandana before putting my helmet. So I will try to also measure my head with the bandana. i appreciate your help again.