Welcome to Day 9/30 of Mastering Guesstimates — Lumos! Hello Everyone, lets continue this series of mastering guesstimates and today we are going to dive deep into the World of Harry Potter. Q. Estimate the number of Harry Potter books sold this year in India. Clarifying Questions: Which Harry Potter book are we talking about? Calculation for e-book or paperback? Calculation…

Welcome to Day 8/30 of Mastering Guesstimates — Q. Estimate the market share of pencils. Clarifying Questions: By pencil you mean only wooden ones or also digital ones like apple pencil or mechanical pencils? Calculation for a box of pencils or pencils as a single unit? Calculation in terms of revenue or quantity? Current market share or projected future? if…

Welcome to Day 7/30 of Mastering Guesstimates — Q. Estimate the market size of eyewear for vehicle owners in Delhi. Clarifying Questions: What kind of vehicle owners? Can you tell more about the product? By eyewear do you mean spectacles, sunglasses or lenses? A. Vehicle owners having personal cars. Basically product is the eye wearable for those suffering with eyesight…

Welcome to Day 6/30 of Mastering Guesstimates — Q. Estimate the number of cars in Delhi. Here, before starting I would like to clarify one thing that on reading the statement at first you might be thinking of this as a Market Sizing Guesstimate but actually it’s not, in this statement we just need to estimate the total…

Welcome to Day 5/30 of Mastering Guesstimates — Q. Calculate the number of queries answered by Google per second. Clarifying Questions: Any particular geography like India, US? Any particular kind of users? Only on Google browser or also searches on youtube and other google products? Any particular device type — IOS or Android? and for App or Website? A. Calculate…

Welcome to Day 4/30 of Mastering Guesstimates — Q. Estimate the number of Uber Drivers in Delhi. Clarifying Questions: Do we need to consider Delhi or Delhi-NCR? Do we need to consider cabs of all types i.e. Go, Pool, Sedan, XL? Calculation for in a Day, Month or Year? Weekend or Weekday? Market share of Uber? A. Consider Delhi, cab…

Welcome to Day 3/30 of Mastering Guesstimates — Q. Estimate the number of trees in Delhi. Clarifying Questions: Do we need to consider Delhi or Delhi-NCR? Do we need to estimate for only Trees or Shrubs or both? A. Consider Delhi for this estimation and calculate specifically for trees only Assumptions: Area of Delhi is ~1500 sq Km Approach: Area of Delhi…

Welcome to Day 2/30 of Mastering Guesstimates — Q. Estimate the Facebook Users in India. Clarifying Questions: Active Facebook users or also the ones who have accounts but don’t use it anymore or have uninstalled the app? Users of any specific gender, age, geography — Rural or Urban? A. Consider Active users as of now and calculate for the whole…

Welcome to Day 1/30 of Mastering Guesstimates — This is one of the very first guesstimate that I solved with one of my Senior, Over the time I have evolved the approach of solving this particular guesstimate. Here I’ll be discussing two approaches to solve this particular guesstimates. Q. Guesstimate the number of schools in Delhi. As told…