1QUESTION 1 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
44
seconds
How to estimate it
Fermi’s official “Napkin math”
Start with the world, about 8 billion people. How much does each of them spend on Amazon in a year? Most spend nothing and big shoppers spend thousands. Call it $100 each on average.
- World population
- 8,000,000,000
- × $100 a person a year
- ≈ $800 billion
- Seconds in a year
- 31,500,000
- 31.5M ÷ 800,000 ($1M chunks)
- ≈ 39 seconds
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- Amazon net sales, full year 2025
- $716,924 million
- Seconds in 2025 (365 × 86,400)
- 31,536,000
- 31,536,000 ÷ 716,924
- ≈ 44 seconds
Reference cited by Fermi: Amazon.com Inc. Form 10-K for 2025 (SEC filing): net sales of $716,924 million
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.