Photo by Antoine Dautry on Unsplash

Guesstimates for Product Interviews, Tips to ask clarification Questions

Estimate the number of Hotels | Estimate the number of users of Google Drive

Follow TechnoManager for more such Product Questions

Estimate the number of Hotel?

Clarification Questions

  1. Understanding of Hotel
  2. Are we also including airbnb, lodges or only hotels? [Only Hotels]
  3. Which geography are we talking about? [Bangalore]

Overall Approach

  1. Define the area of the bangalore that will be around 600Km².
  2. Since there is a national park, lot of lakes, forests, wetlands so assuming that around ~50% of the area is there where a potential hotel can reside.
  3. So we are looking around area of 300Km², we can divide this area into 3 parts according to the density, assuming normal distribution 25% highly dense for the hotel, 50% mid dense and rest 25% is low dense.
  4. For highly dense that is closely around 75km², for a Km² we can have 5 hotels, that is around 375 hotels.
  5. For mid dense(150Km²), on an average we have around 2.5Hotels per km² , so for mid dense it will be around 375 hotels
  6. For low dense (75 Km²), on an average we would be having 0.5 Hotels per Km², so we will be having around 35 hotels. Total number of hotels in bangalore will be around ~800

Gut Check of the Final number

Bangalore population is around 1.5 Crore and it is also a place where a lot of business travellers come and also people come for vacations, so safely we can assume that 1 out of every 1000 to be tourist. So we will be requiring hotels to accommodate around 15K people. On an average we can assume that a hotel will be having 20 rooms, so total number of rooms would be around 16K, if we take account the occupancy, this would be something close to what we have state.

Similar approach can be used to estimate the number of Restaurants, Tech parks, Children parks, Temples etc.

Estimate the number of users of Google Drive?

Clarification Questions

  1. Understanding of Google Drive
  2. Are we looking for personal users or enterprise users or overall users? [Both]
  3. Are we looking for a particular geography or globally? [Global]
  4. Are we looking for daily users or monthly users or yearly users. [Daily]

Overall Approach

  1. Total world population ~ 7.5 billion but there are some countries where google services are not allowed like Chine and some part of russia, so we can eliminate around 1.5 billion people from our set.
  2. We are looking around 5 billion people and approximately people above 15 and less than 60 will be the one who are potential Google services users. So we are looking around 60% of 5 billion that is ~ 3 billion people.
  3. We can also think about the internet penetration around the globe that is around 60%, so it will be ~ 1.8 billion people.
  4. Since there are other services as well like onedrive, dropbox etc so we can assume the market share to be 70% , so around ~1.25 billion users of Google Drive

Similar approach can be used to calculate the guesstimates around Google Search, Youtube, Gmail etc.

Gut check of the final number

Given the kind of market penetration, it is okay to have 1 out every 4 people all over the world using Google Drive.

Book a slot with Industry Product Managers for resume review, mock interviews, and PM interview tips/tricks

Tips to think of clarification Questions

Sample Problem — Estimate the market size for product X

  1. First clarify your understanding of the product X.
  2. If there are multiple version of product X (Youtube or Youtube Music), clarify which he is focusing on, if it has multiple platform (android vs ios vs desktop)?
  3. Clarify the understanding of the market size (in terms of Volume or in terms of revenue)?
  4. Clarify if it is for a particular geography or demography?
  5. Finally reiterate your goal which you want to achieve?

Hey if you like my content on Medium or TechnoManager and find it resourceful, you can Buy me a Book to show your support and hit that clap button.

Product Manager | IIM Bangalore | IIT Kanpur |

Love podcasts or audiobooks? Learn on the go with our new app.

Recommended from Medium

10+ Effective Email Ideas To Inspire Your Next Campaign Today And Boost Your Conversions Tomorrow

Marketing during coronavirus: Psychologists can help

Sorry Silicon Valley, Clubhouse -in its current form- will be a fad

The Remote Renaissance

Image of Michelangelo’s David sculpture popping out of a Zoom window frame

7 Reasons Why You must Focus on Content Marketing for your Business.

Online Reputation Management 101

Will Artificial Intelligence Replace Marketers?

My Top Growth Hack On How To Gain The Attention And Connect With Your Ideal Prospects On LinkedIn…

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
Shailesh Sharma

Shailesh Sharma

Product Manager | IIM Bangalore | IIT Kanpur |

More from Medium

How to Answer “Why Are You Leaving Your Current Job” in a Product Manager Interview

Day — 3Google Product Interview Preparation

Biggest challenges for Product Managers

How to Make Your Glue Stronger: Navigating Product Management Interviews