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What should the air capacity be for my scuba tank?

Tank Capacities Depend on the Diver's Needs

Divers want a scuba tank that is lightweight but has the capacity they need for air. Check out this list of tank capacities and how they fit divers' needs:

For shallow diving, all you need is a 50 to 63 cubic foot tank.
The 80 cubic foot tank is considered standard and can be used for deeper dives.
People who are heavy breathers -- often large men -- may need more air capacity. There are 100 cubic foot tanks that should serve them.
Finally, pony tanks are backup spare air tanks that are smaller in size and used in emergencies when primary air fails.

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