Answer & explanation
Counting all cars, not only electric ones.
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
200
cars
How to estimate it
Fermi’s official “Napkin math”
I am going to assume there is 1 car for every 8 people. That gets me to 1B total cars world wide. What percentage are electric? not much, maybe 5% so 50M cars. I don't think there are enough chargers for every car to charge at once (similar to gas statoins) I am goign to say there is a public charger for 1/10 EVs (5M chargers)
- World population
- 8,000,000,000
- 1 car for every 8 people
- ≈ 1 billion cars
- About 5% are electric
- ≈ 50 million EVs
- 1 public charger per 10 EVs
- ≈ 5 million chargers
- 1 billion ÷ 5 million
- ≈ 200
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- Cars on the road worldwide
- ≈ 1.5 billion
- Public charging points
- ≈ 7.2 million
- 1.5B ÷ 7.2M
- ≈ 200
Reference cited by Fermi: IEA Global EV Outlook 2026 · BloombergNEF
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