1QUESTION 1 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
1,500,000
euros
How to estimate it
Fermi’s official “Napkin math”
Start with the crowds. Roughly 10 million people a year stop at the Trevi Fountain. How many actually throw a coin in? It is the whole reason they came, so call it a third, tossing maybe 50 cents each.
- Visitors per year
- ≈ 10,000,000
- Throw a coin in
- ≈ 1 in 3
- Average coin
- ≈ €0.50
- 10M ÷ 3 × 0.50
- ≈ €1,700,000
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- Coins fished out of the fountain, roughly
- ≈ €3,000 per day
- × 365 days
- ≈ €1.1 million
- Caritas Rome's reported 2022 collection
- €1.4 million
- Typical annual haul
- ≈ €1.5 million
Reference cited by Fermi: Caritas Rome, the Catholic charity that collects and counts the fountain's coins for the Diocese of Rome
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.