What are Guestimates and the Proper Approach to answer Guestimates?

Posted Date: 16 Sep 2023
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What are Guesstimates?

Often students come across questions that have limited details and information. Some examples are How many cars are there in New Delhi? These are known as Guesstimates.  Guesstimates are not about precision; they're about making educated guesses. These questions are prepared to compel the interviewee to use their reasoning and problem-solving skills. These questions are asked in various fields (to state a few, Product Management and Consulting) where you have to make decisions based on the availability of only a few resources. 

Importance of Guesstimate Questions

Guestimates at first feel like a typical task where candidates or interviewees first have to analyze the kind of questions asked. When you engage with many such guesstimates problems it will further improve your reasoning and effective communication.

  • Decision-Making: Guesstimates help individuals and organizations make decisions when they don't have access to accurate or complete information. For instance, in business, they can be used to estimate market potential or project feasibility.
  • Problem-Solving: Guesstimates are valuable in solving problems that involve numerical or quantitative aspects. They allow you to make reasonable assumptions and work through a problem logically.
  • Creativity and Innovation: Guesstimates encourage creative thinking and innovation. They require you to think outside the box and consider various factors that may influence the outcome.
  • Time Management: Guesstimates can save time when you need to make quick decisions or provide rough estimates on the spot. In situations where detailed analysis is not feasible, a guesstimate can provide a ballpark figure.
  • Communication: Guesstimates are useful for conveying complex ideas or scenarios in a simplified manner. They can make information more accessible to a broader audience.
  • Resource Allocation: In various fields, such as project management or resource allocation, guesstimates are essential for making budgetary and resource allocation decisions. They provide a basis for setting priorities and allocating resources effectively.

Top Interview Questions with Guesstimates

There are many possibilities of getting guestimates questions asked but here are the top 5 examples of the type you will face. 

1. How many cups of coffee were consumed in Delhi last month? 


The population of Delhi is 20 million people.

The average person in Delhi consumes 2 cups of coffee per day.


20 million people * 2 cups of coffee per day * 30 days in a month = over 1 billion cups of coffee

This is just a rough estimate, of course. The actual number of cups of coffee consumed in Delhi last month could be higher or lower, depending on a number of factors. But this estimate gives us a general idea of how much coffee is consumed in Delhi on a regular basis.

2. What is the size of the iPhone market in India?

Simple answer: The iPhone market in India is worth over $1 billion.


Apple has a 5% market share in the Indian smartphone market.

The average price of an iPhone in India is $700.


5% market share * Indian smartphone market size (estimated at $20 billion) = $1 billion iPhone market size

This is just a rough estimate, of course. The actual size of the iPhone market in India could be higher or lower, depending on a number of factors. But this estimate gives us a general idea of how big the market is.

It is worth noting that the iPhone market in India is growing rapidly. In 2022, iPhone sales in India grew by 50% year-over-year. This growth is being driven by a number of factors, including the increasing popularity of premium smartphones in India and Apple's efforts to make its products more affordable for Indian consumers.

If the current growth rate continues, the iPhone market in India could be worth several billion dollars in the next few years.

3. What is the weight of the Taj Hotel?


The Taj Hotel is approximately 200 meters tall and 100 meters wide.

The average density of concrete, steel, and glass is 2.5 tons per cubic meter.


Volume of the Taj Hotel: 200 meters * 100 meters * 10 meters = 2 million cubic meters

Weight of the Taj Hotel: 2 million cubic meters * 2.5 tons per cubic meter = 5 million tons

Simple answer: The Taj Hotel in Mumbai weighs about 5 million tons.

This is a more accurate estimate than the previous one, as it takes into account the actual dimensions of the building. It is also more intuitive, as it is expressed in a unit that most people are familiar with (tons).

Tips to answer Guesstimate Interview Questions

Here are some tips that will help you guess right. Just remember that there is no wrong or right answer while writing guesstimates. You just have to follow the same procedure as the basic one in childhood. 

  • Write things down: Remember to break down the question for your convenience. Make full use of the blank sheet provided to you and write every part of the question down. 
  • Be clear with your thoughts- Once you have considered all angles and have employed whatever facts you have on hand, formulate an answer in your head.
  • Check Your Logic: Ensure that your estimation makes logical sense. If your estimate results in an unrealistic or absurd outcome, reconsider your approach.
  • Consider External Factors: Think about external factors that could influence your estimation. For example, if estimating the number of pizza slices sold in a day, consider whether it's a weekend or a weekday, and how that might affect sales.

Thus, as you would have already understood Guesstimate interview questions are a common way for interviewers to assess the problem-solving skills and analytical thinking of the interviewee. By following the tips outlined in this blog post, you can easily and efficiently answer these questions.



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