3QUESTION 3 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
230
pieces
How to estimate it
Fermi’s official “Napkin math”
Start with the 8 billion people on Earth. How many of them grew up with a tub of LEGO? Maybe 1 in 5, and a decent tub holds about 1,000 pieces.
- People on Earth
- 8,000,000,000
- 1 in 5 had a tub
- ≈ 1.6 billion
- × 1,000 pieces
- ≈ 1.6 trillion
- ÷ 8 billion people
- ≈ 200 pieces
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- LEGO pieces by mid-2015: 600 billion (UK IPO) to 760 billion (2014 reports)
- ≈ 700 billion
- Made since: LEGO revenue since mid-2015, about DKK 630 billion × 1.9 billion pieces per DKK billion
- ≈ 1.2 trillion
- Every LEGO piece ever made
- ≈ 1.9 trillion
- 1.9 trillion ÷ 8.3 billion people (UN)
- ≈ 230
Reference cited by Fermi: LEGO annual reports, piece counts via TIME and UK IPO · UN World Population Prospects 2024
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.