Andreas, Case In Point is my favorite resource to practice guesstimate questions. I have used it before joning to BCG 10 years ago. I had 3 guesstimate questions during my interviewing cases. I... (more)

# All questions tagged Guesstimate - Consulting Q&A - PrepLounge.com

Ask a question## Examples for guesstimate/Fermi questions

## Best approach to: How many Kilos of potatoes does McDonalds need per year in the US?

Hey anonymous, Start by clarifying for what are potatoes used for. I'm assuming it's only for fries (but don't exactly know the full menu of McDonalds in the US). I would divide this problem int... (more)

## What is the weight of Boeing 747?

Hi! This question is more a brainteaser and it's less about the actual weight but rather about how you will measure it. You can use both non-creative and creative approaches: 1) You can weig... (more)

## The number of taxis operating per day in Dubai?

I approached the question in two steps: 1) Demand side 2) Supply side 1) Demand Step 1) Population of Dubai is approximately 3m Step 2) I divided the population in different age groups, a... (more)

## How do you calculate the market size of the Food Delivery Service industry?

Let us consider the city of Coimbatore, Tamil Nadu, India for our calculation.Coimbatore has a total population of 10,50,721 people. Then approximately it will be about 2,62,681 households. Since Coim... (more)

## How does one feel confident about solving guesstimates?

You have actually nicely pointed out some of the common segmentation parameters. 0) Population / Household - It is good also to prepare a table of population of various countries 1) Geography split... (more)

## How many people enter the German job market per year

Maybe oversimplistic but my approach would be the following: I would start by assuming that every person who is born in Germany at a certain point in his/her life (18,23,30 years old...) will start... (more)

## What are guesstimate questions exactly?

Hi, I've seen that some books using the word "guesstimates" for market sizing, for brainteasers and for the mix of both (weight of the Boeing). In reality what matters is that there are 2 types of... (more)

## Wieviele Berufseinsteiger gibt es in Deutschland jährlich?

Hallo Anonym A, aus meiner Sicht lässt sich der Brainteaser deutlich einfacher lösen: Ansatz In Deutschland leben ca 83 Mio (runden auf 80 Mio) Menschen Die durchschnittliche Leben... (more)

## Wie viel Kaviar wird in der 1st Class Lufthansa als %Anteil des weltweiten Gesamtkonsums ausgegeben?

Annahme: Jährliche Betrachtung. Es wird in jedem 1st Class Flug d. Lufthansa Kaviar angeboten. Gleic... (more)

## How can we estimate the market size of second hand cars

Hi, 1. Number of cars out there start with population segment by age to identify drivers assumme an avergae # car / driver (should be <1 !) 2. Number second hand cars Assume a share o... (more)

## Estimate the number of golf balls that can fit in a 747

Hi, lol, the famous one. I will quickly explain the principle here and leave you the maths :) 1. Calculate the volume available in an air plane Central bridge : you can consider this as cylinder,... (more)

## Market Sizing - Number of cars sold in Malaysia per Year

Hi Anonymous, as mentioned by Elias, the fact that you don't get the exact number is not a major problem in a market sizing so far that you are not an order of magnitude above or below the real num... (more)

## Market Sizing - Guess the number of rats sold in the US?

This seems like an interesting one as you could actually make the discussion quite extensive. So this is how I would go about it (if this does not make sense I'd gladly be corrected): At the moment... (more)

## Marketing Sizing - How many pizza are sold in Brazil?

I think there are 2 issues in your approach - 1. You started first with age group and then shifted to households Households will have people less than 15 and more than 50 years of age. In your... (more)

## Valuation/Sizing - Determine an appropriate value and method for valuation of the Empire State building?

Hi, You may use several methods: Discounted cash flows from the rent + other revenue streams (e.g. observation deck, souvenirs, events, etc) The fair value of assets (land, building) Benc... (more)

## How many flights would be there at any time flying in US skies?

Hi, This is somehow related to a previous question posted here on the total number of flyes. Once you get this number, you can assume a time window where plane are flying (e.g exluce nidgt flyes)... (more)

## Consulting Case: How many rádio stations have in the USA?

Hi, I think your approach has its merits. However, I believe your assumptions are overly aggressive - 3 radio stations in a small town is A LOT. Now the challenge is to come up with numbers... (more)