1QUESTION 1 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
3,623
mosques
How to estimate it
Fermi’s official “Napkin math”
Well the Hagia Sophia makes one... Istanbul is huge, maybe 15 million people. How many share a neighborhood mosque? Maybe 5,000.
- Istanbul population
- 15,000,000
- People per mosque
- ≈ 5,000
- 15M ÷ 5,000
- ≈ 3,000
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- Diyanet count, December 2021
- 3,555
- Diyanet count, 2024
- 3,604
- Diyanet count, 2025-26
- 3,623
Reference cited by Fermi: Diyanet mosque count, 2025-26
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.