3QUESTION 3 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
1,514
doors
How to estimate it
Fermi’s official “Napkin math”
Start with rooms. Buckingham Palace is famously enormous, so call it 800 rooms. How many doors does one room need? One to get in, plus grand rooms open onto each other, so say 2.
- Rooms in the Palace
- ≈ 800
- Doors per room
- × 2
- 800 × 2
- ≈ 1,600
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- Doors in Buckingham Palace (the standard Royal Household figure, alongside 760 windows)
- 1,514
- For scale, rooms in the Palace (royal.uk)
- 775
- Doors per room
- ≈ 2
Reference cited by Fermi: The Royal Household's Buckingham Palace facts (royal.uk), which lists 775 rooms; the 1,514 doors and 760 windows figures come from the same Palace-by-numbers set
How close was your guess?
Your comparison will appear here.
Compare by ratio: divide the larger number by the smaller one. The closer to 1×, the better.