Buoyancy Calculator
Estimate the lead weight you need for neutral buoyancy based on your body composition, exposure suit, water type, and tank.
Inputs
%
Results
Lead weight needed (kg)
8
Lead weight needed (lbs)17.6
Suit buoyancy (kg)6.7
Body buoyancy (kg)-2
Tank buoyancy (kg)1.8
Net buoyancy at 10 m (kg)-3.8
How to Use This Calculator
- Enter your body weight in kg and height in cm.
- Estimate your body fat percentage — higher fat means more positive buoyancy.
- Select your exposure suit type (none, shorty, 3 mm full, 5 mm full, 7 mm full, or drysuit).
- Choose fresh or salt water — salt water provides additional buoyancy requiring more lead.
- Select your tank type (AL80, Steel 80, AL63, or Steel 100) as each has a different empty buoyancy.
- Read Lead Weight Needed in kg (and lbs) and start in the pool to fine-tune before your open-water dive.
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