All Fermi answers
Fermi #59 · Question 1

How many crew members work aboard Icon of the Seas, the largest cruise ship in the world?

Explore the official answer and the simple reasoning behind this Fermi estimate.

1QUESTION 1 OF 3

Answer & explanation

The official answer, with Fermi’s reasoning step by step.

Official Fermi illustration

Illustration for: How many crew members work aboard Icon of the Seas, the largest cruise ship in the world?

Illustration from Fermi.gg

Answer & explanation

Official answer

2,350

crew members

How to estimate it

Fermi’s official “Napkin math”

Icon is one of the biggest cruise ships ever built, so start with the guests. Call it 6,000. How many crew to look after them? Someone is always cooking, cleaning or serving, so maybe 1 for every 3 guests.

Guests aboard
~6,000
One crew member per
÷ 3 guests
6,000 ÷ 3
≈ 2,000

Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.

Source calculation & reference
Guests at double occupancy
5,610
Guests per crew member
÷ 2.39
5,610 ÷ 2.39
≈ 2,350

Reference cited by Fermi: Royal Caribbean Press Center, Icon of the Seas fact sheet

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