3QUESTION 3 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
130,000,000
slices
How to estimate it
Fermi’s official “Napkin math”
The easiest place to start is the US population, about 330 million. How often does the average person eat pizza? Maybe once a week, 3 slices at a time.
- US population
- 330,000,000
- Slices each per week
- × 3
- 1B a week ÷ 7 days
- ≈ 140 million
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- U.S. population
- ≈ 335 M
- Eat pizza on a given day
- × 11%
- Slices at one sitting
- × ~3.5
- Daily slices
- ≈ 130 million
Reference cited by Fermi: USDA Food Surveys Research Group, Pizza Consumption in the U.S. (What We Eat in America, NHANES 2017–March 2020)
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.