weights

[Chadwick]

Here is the bits out of the PADI AOW book, 'Adventures in Diving' ... (page 213).
This is to determine a starting point.

3mm/1/16 in. one piece wet suit, shorties, jumpsuits: 5% bodyweight

salt/fresh water change:
187-217lbs: 7lb (add to above for salt, subtract for fresh)

Aluminum 80 cf tank: Add 5lbs.

9.5 + 7 + 5 = 21.5 lbs.

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FWIW: I am 200lbs and in a full 3mm wet suit with gloves, hood and booties with a 50cf tank, I wore 28lbs in salt water. Though I believe I was heavy.
In Cancun, I dove skin with an 80 cf tank with 12lbs and was weighted ok.
Hope that helps.
-Chad