3QUESTION 3 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
18,000
trees
How to estimate it
Fermi’s official “Napkin math”
Central Park is about 2.5 miles long and half a mile wide, a bit over 800 acres. How many trees per acre? It's mostly lawns and paths, so not dense, maybe 20.
- Park size
- ~800 acres
- Trees per acre
- × 20
- 800 × 20
- ≈ 16,000
Central Park is about 4 kilometers long and 800 meters wide, roughly 340 hectares. How many trees per hectare? It's mostly lawns and paths, so not dense, maybe 50.
- Park size
- ~340 hectares
- Trees per hectare
- × 50
- 340 × 50
- ≈ 17,000
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- Park area
- 843 acres
- Tree species
- ~170
- Conservancy-maintained inventory
- ≈ 18,000
Reference cited by Fermi: Central Park Conservancy
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.