1QUESTION 1 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
7,000,000
sandwiches
How to estimate it
Fermi’s official “Napkin math”
Subway has more shops than any chain on Earth, about 40,000 of them. How many subs does one shop make in a day? A lunch rush and a dinner rush, call it 150.
- Subway shops worldwide
- ≈ 40,000
- Subs per shop per day
- × 150
- 40,000 × 150
- ≈ 6,000,000
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- Subway restaurants worldwide, 2017
- ≈ 44,000
- Sandwiches per restaurant per day (implied)
- × ≈ 160
- Subway's own figure
- ≈ 7,000,000
Reference cited by Fermi: Subway corporate boilerplate, 2017: 7 million made-to-order sandwiches a day
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.