1QUESTION 1 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
6,000,000
divers
How to estimate it
Fermi’s official “Napkin math”
The easiest handle is the US, far and away the biggest dive market. Something like 3 million Americans get in the water in a given year. Diving is a rich country hobby and the US is about half of it, so double.
- Active divers in the US
- ~3,000,000
- US share of the world
- ~1/2
- 3M × 2
- ≈ 6,000,000
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- PADI certifications issued since 1967
- > 30 million
- But a card is for life, and most stop diving
- ~1 in 5 still active
- DEMA active divers worldwide
- ≈ 6 million
Reference cited by Fermi: DEMA Diving Fast Facts
How close was your guess?
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