Scuba Diving Weight Calculator
Estimate a practical starting ballast range from body weight, experience, water type, cylinder material and exposure suit.
Start closer to neutral.
Use this only as a starting estimate, then confirm final weighting with a proper in-water buoyancy check using the equipment you will actually dive.
How scuba weighting estimates are built
A weighting estimate combines diver characteristics with exposure protection, cylinder type, water type and equipment. Salt water generally requires more ballast than fresh water, while thicker or more buoyant exposure protection also increases the amount needed.
Example: the same diver using a thicker wetsuit in salt water will normally require more weight than when diving a thin suit in fresh water. The calculator adjusts the estimate from the selected conditions rather than using body weight alone.
Weighting calculators provide a starting estimate only. Cylinder buoyancy, suit compression, body composition, accessories and equipment configuration vary. Confirm correct weighting with an appropriate buoyancy check in controlled conditions.
The calculator updates instantly from the values you enter and shows the core planning result in the dark result card.
Use realistic values from your own diving and leave a practical margin for changes in workload, conditions and equipment.
Treat this page as an educational reference and cross-check the result with your training, analysed gas and an appropriate dive-planning method.