Many of you will recognize the name, formerly known as NetDoc on ScubaBoard, known as The Chairman today. One of Pete’s strengths in teaching buoyancy and trim. While slightly different than my own, I wanted to share (I received his permission) for the following methods for divers to get their weight determined. The content below has been cut and pasted from:
https://www.scubaboard.com/community/threads/buoyancy.590103/page-5#post-8868207
Best way to figure out your starting weight is at the beginning of your dive and not the end so you can enjoy your dive.
- Full tank
- No weights
- Remove all air from BC
- Cross your legs
- No kicking
- Fold your arms
- No hand sculling
- Reg in your mouth
- Breathe normally
- While floating relaxed, add a pound for every inch your head is out of the water
- Recheck
- Stop when your head is just awash
- Water just barely going over
- You should sink if you exhale and hold it
- Dive! Have fun!
- Empty all your air from your BC at your safety stop, cross legs & fold arms
- If you sink, take off a pound or two on the next dive
- If you’re floaty, add a pound or two on the next dive
- Pause your breathing on the exhale rather than the inhale to compensate
Kosta's Diving Blog 