Scuba Weight Calculator
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Weight when diving without a wetsuit

In warm water with just a swimsuit or rash guard you need little lead.

Body weight
Exposure suit
Tank
Water
Body build
This is a starting estimate. Real buoyancy varies by body, gear and wetsuit age. Confirm with a buoyancy check and follow your training agency and instructor. Read the disclaimer.

Weight when diving without a wetsuit: what to know

Without neoprene most of your lift comes from your body and the tank. Many lean divers need very little or no extra weight.

Diver in swimwear without a wetsuit

Worked example

For an 80 kg diver with an average build, wearing no suit and using an aluminum 80 tank in saltwater, the calculator estimates 2.5 kg (5.5 lb). Your number will differ with your body and gear, so enter your own values above and then do a buoyancy check.

Common questions

Do I need weights without a wetsuit?

Often 1 to 3 kg. Check at the surface with an almost empty tank.

Is a rash guard the same as no suit?

Close enough. It adds negligible lift.

Can I dive with no weight at all?

Some lean divers can in warm water with a steel tank, but always check at the surface with a nearly empty tank.

Do I need weight with a rash guard or dive skin?

Usually only a little, because these add almost no lift.

Why use the calculator with no suit?

To see how much of your weighting comes from your body and tank alone.

Related calculators

Weight for freshwater divingWeight for saltwater divingWeight with an aluminum 80 tankHow much weight do I need?

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Guides and theory

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Comparisons

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3 mm vs 5 mm vs 7 mm
Freshwater vs saltwater