3QUESTION 3 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
5,200,000
pints
How to estimate it
Fermi’s official “Napkin math”
Start with the world's population, 8 billion. Guinness is famous everywhere but most of the planet never touches it. How many have a pint on a given day? Maybe 1 in every 1,500.
- World population
- 8,000,000,000
- Have a Guinness today
- ≈ 1 in 1,500
- 8B ÷ 1,500
- ≈ 5,300,000
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- Pints of Guinness sold worldwide each year (Guinness)
- 1,883,200,000
- Days in a year
- ÷ 365
- ≈
- 5,200,000
Reference cited by Fermi: Guinness official FAQ (guinness.com), annual worldwide pint sales
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.