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Market sizing question

Hi 

Can you help me with this question?

If you open a cafe in a metro station, how would you calculate the market size? as it is mainly driven by metro users

 

Thanks

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16 hrs ago
Ex-BCG Principal | 8+ years consulting experience in SEA | BCG top interviewer & top performer

Hi,

It would be better if you could share a proper attempt at the answer, including structure and/or assumptions.

This way you could get more targeted and effective feedback, and you get to practice your thinking rather than relying on someone to feed you the answer. If you are really new to market sizing, and really have no idea on how to tackle a sizing question, then you can read this great PrepLounge article and then try it for yourself: https://www.preplounge.com/en/case-interview-basics/market-sizing

As a high level hint for you in your attempt - this question is most effectively done from a bottom-up POV. 

13 hrs ago
#1 Rated McKinsey Coach | Top MBB Coach | Verifiable success rates

Hi there, 

This is a cool prompt, but you stand to benefit more if you share with us your approach and then we can provide feedback on it. Ideally try to come up with two approaches, just so you can push your thinking around how to tackle such an exercise. 

Best,
Cristian

Alessa
Coach
7 hrs ago
xMcKinsey & Company | xBCG | xRB | >400 coachings | feel free to schedule an intro call for free

Hey!

Sure! I’d start by estimating daily foot traffic at the station, then assume a % of those who might buy coffee (e.g. 2–5%). Multiply by average spend per customer, then by days open per year. That gives you annual revenue = your market size.

Happy to walk through numbers if you want!

Best,
Alessa 

Mariana
Coach
edited on Jul 09, 2025
Free CV evaluation | xMckinsey | Consulting and Tech | 1.5h session | +200 sessions | Free 20-min introductory call

Hi there!

Alessa already gave a reasonable structure. Are you struggling with this type os question? The one you posted is a rather basic one, take a look at Crafting Cases free course, they have a market sizing session that is good.

Best,

Mari

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