200+ Estimation Questions asked at PM Job interviews
200+ Estimation Questions asked at PM Job interviews
Guess Estimation problems are very common in Product Management and Consulting Interview. Here is a list of some important data points that will help you out.
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\Below are few data that one should remember while solving guess estimation problems. These will help you reach at a number that is close to the actual value which you are guesstimating.
Note - These data points are made specifically for Indian readers, but can be made for other countries as well.
What are the objectives of a guesstimate question?
It is to understand your ability to,
1. Understand a situation.
2. Connect things to reach an answer.
3. Prioritize and dismiss different parameters.
4. Work with limited information.
To help you with your Product Manager interview preparations, we have compiled a complete list of the most asked Product Management Interview Questions and Answers at companies like Facebook, Google, Amazon, Microsoft, Netflix, etc. answered by PMs at FAANG.
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Let’s jump in,
Total world population = 7.3 billion
The population of India = 1.3 Billion (~18% of the world population)
Population of Delhi - 30 million
Population of Mumbai - 20 million
Population of Kolkata - 15 million
Population of Bangalore - 12 million
Population of Chennai - 10 million
Rural : Urban split = 70 : 30 = 900 : 400 million
Average household size in India is 4. (Urban - 3, Rural - 5)
Households in India = 1300 Million / 4 = 325 million
Households based on Rural : Urban split = 900/5 : 400/3 = 180 : 133 million
Male : Female ratio in India = 50 : 50 % = ~ 650 million each.
Male : Female ratio in world = 50 : 50 % = ~ 3.65 billion each.
Population of Married / Others = 50% = 650 million
Population of Never Married = 50% = 650 million
Age groups in India -
0 - 14 = 30% = 390 million
15 - 35 = 40% = 520 million
35 - 60 = 25% = 325 million
60+ = 5% = 65 million
Income Groups in India -
Poor = 20% = 260 million
Low = 75% = 975 million
Middle = 3.5% = 45 million
Upper Middle = 1% = 13 million
High = 0.5% = 6.5 million
Number of Pincodes in India = ~20,000
Smartphone users in India = 60% = 800 million
Internet penetration in India = 50% = 625 million
Below Poverty Line in India = 15%
Births per year in India = 25 million. (of which 1/3rd dies = 8M)
Population Density of -
India = 400 / km sq.
Kolkata = 25,000 / km sq.
Mumbai = 32,000 / km sq.
Delhi = 20,000 / km sq.
Population by Continents -
Asia - 60% = 4.3 billion
Africa - 15% = 1.1 billion
Europe - 10% = 730 million
Latin America - 10% = 730 million
North America - 5% = 365 million
Age Groups (World) -
0-5 years = 10% = 730 million
6 - 14 years = 20% = 1.46 billion
15 - 35 years = 40% = 2.9 billion
36 - 60 years = 20% = 1.46 billion
60+ = 10% = 730 million
Income Group (World) -
Poor (<$2) - 15% = 1.1 billion
Low ($2 - $10) - 55% = 4 billion
Middle ($10 - $20) - 15% = 1.1 billion
Upper Middle ($20 - $50) - 10% = 730 million
High ($50+) - 5% = 365 million
Number of smartphone users in the world = 4 billion.
US population: 330M
California population: 40M
NYC population: 8M
World population: 7.8B
Size of continental US: 3M square miles
US households: 130M
Average people per household in the US: 3
Life expectancy: 72
Median household income: $65,000
Weight of an average car: 4000lbs
Technical
Amazon S3 Standard cost: $0.023 / GB / month
Average file size for a 90-min 720p movie: roughly 3.5GB
Average file size for a smartphone camera picture: roughly 3-5 MB
Average CTR for a search ad: 1.91%
Average landing page conversion rate: 2.35%
Average WiFi bandwidth: ~10Mbps
Cost of iPhone 12 Pro: $999
Cost of Google Pixel 5: $699
Cost of Amazon Echo (4th Gen): $99
General sense of revenue (2020)
Dropbox revenue: $2B
Airbnb revenue: $3B
Google revenue: $181B
Facebook revenue: $86B
Apple revenue: $274B
Amazon revenue: $386B
Netflix revenue: $25B
Google (Alphabet) net income: $40.27 billion
Apple R&D expenditure: $18.75 billion
General sense of user populations
Netflix (Q2 2021): 209 million subscribers
Google G Suite (March 2020): 2 billion+ monthly active users
Uber (Jun 2021): ~1 million drivers in the US
Twitter (Q1 2018): 192 million daily active users
Number of Americans that own a smart speaker (Jan 2020): 60 million
Number of products Amazon sells: over 12 million (not including Amazon marketplace sellers, which brings the total to 350 million)
Now that you know all these numbers, it’s time to practice!
How much storage space do you need to store all the information from Google maps?
Estimate the Number of WhatsApp Chats occurring in India [FREE]
Estimate the Number of Hours spent on Smart Phones by all Indians
Estimate the Number of Golf balls that can fit in a School Bus
Estimate the Number of Tennis balls you can fit in an Aircraft
Estimate the Number of Refrigerators sold in India every year
Estimate the storage space is required to host all the images of Google Street View
Estimate the Number of Queries Answered by Google per Second
Common Mistakes to avoid while Answering Estimation Questions
Calculate the number of queries answered by Google per second.
How many dentists are there in New York?
If you are opening a new Walmart branch, how would you decide how many cash registers are needed for the store?
Estimate the number of Uber rides.
How many elevators should an average office building have?
How much storage is required to store all of the images on Google Maps?
How much storage space is required to host all the images of Google Street View?
What is the market size of toilet paper in the US?
Estimate the number of Tesla Model3s in California.
Estimate the number of WhatsApp chats occuring in India.
A company has launched a new drug that eliminates the need for sleep. How would you price this drug?
Estimate the number of bicycles required to start a bike sharing operation in a big city.
How many passengers are in planes in the air at any given time in the U.S.A.?
How would you estimate the total number of cars right now in Highway 101 between San Francisco and Mountain View?
How much revenue did Gmail make from ads in the USA last year?
Estimate the number of planes that are in the air in an hour.
Estimate the number of passengers arriving in SF airport every day.
How many balls does it take to fill a 16x16 ft room?
You have a grocery delivery service that delivers food within 24 hours. How many trucks would you need to operate it?
Estimate the memory needed for Nest cameras for the fiscal year 2020.
Estimate the total number of videos on YouTube.
What is the market for driverless cars in 2020?
How many pixel phones were sold by Google worldwide in the last 12 months?
How would you estimate the number of new users Amazon gets in a day?
Estimate the daily bandwidth consumed by YouTube globally.
How would you increase the revenue of MS Powerpoint?
Estimate the number of Facebook users in India.
How many queries per second does Gmail get?
How would you estimate the bandwidth of Gmail for a community in Mars?
How many apps are in the Apple App Store or Android Playstore?
How would you estimate how many people are watching Youtube in India right now?
How much time is spent by people while waiting in their vehicles at traffic signals in the US?
Estimate how many trains operate in the NYC subway.
Estimate the cost of storing Google Photos on the photos app.
How would you estimate the number of mobile phones sold by Xiaomi in a day?
How many airports are in the US and in the World?
Imagine you created a new type of product that would replace the mobile phone. How would you determine how many units to manufacture?
How many mobile phones are there in the world?
How much storage space do you need for Google Maps?
Estimate the total number of millennials who own homes in the US.
How many kindergarten teachers are there in USA?
YouTube Red is a premium service without ads. Assume that 1.5% of initial YouTube user base signs up for the service. What is the lifetime revenue Google generates from those users?
Estimate the number of groups on Facebook
Estimate the market size of Prime video.
How would you estimate the space required for Google Photos?
Estimate the bandwidth (bits / s) of a 747 crossing the Atlantic filled with CDs.
If you are planning to kick off YouTube TV in SFO, how much bandwidth would be required?
You are a product delivery manager at Amazon. Estimate how many face masks Amazon needs to stock in UK stores during the COVID-19 lockdown period.
Estimate the number of actual COVID-19 positive people in India as of today.
Estimate the weight of of a 747 airplane.
Tesla claims it will make Auto Garage Shops obsolete due to zero maintenance.
Estimate how many jobs will be impacted in the US in 5 years and 10 years.
How many videos can you watch with 2 GB of data?
How much time is spent waiting per day for a real human in the Automated Systems in the US?
Estimate the market size of an online flight insurance business in the US.
How much would it cost to set up WiFi in New York?
What is the market size of toilet paper in Canada?
How much money is spent in the USA per year on gas?
Estimate how much budget is required for Facebook to maintain Facebook Photos.
Estimate the number of videos uploaded to Youtube per day.
How much revenue can Google get from driverless cars?
Should Amazon increase the price of Prime Membership? If so, estimate the revenue generated or lost.
Estimate the number of electric vehicles in Bangalore.
Estimate the ad revenue of a photo sharing social media app.
What is the market size of the Art market in the UK?
How many people are playing golf in the world right now?
Estimate the number of hotels in NYC.
There is a colony of 1000 people on the moon. Estimate the bandwidth needed. How would you provide internet to them?
Estimate the number of gas stations in SF city.
What is the market for income tax software in the US?
How would you go about finding out the number of red cars in China?
Estimate the total dollar amount of online sales for fruits and vegetables per year in US.
Estimate the weight of an aeroplane. How would you go about calculating it?
How many drivers does Uber have in a medium-sized US city?
How many potential TV buyers are there in NY? Walk us through your thought process.
Estimate the number of piano tuners in San Francisco.
How would you prepare a one month projection of a newly opened Ikea store for the company CEO?
Estimate how many product managers work at Google?
Estimate the number of tube lights used in a big city (10 Million Population).
How many X-Rays are done in the World in a Year?
What are the estimated number of “incidents” that could be reported by users of Waymo in the SF Bay Area?
How many airplanes fly everyday in the world?
How much money does India lose due to traffic congestion?
Estimate the total number of cows in Canada.
A biotech company has launched a cell-based blood that reduces dependence on donation. How much would you price this blood?
How many GSuite users are there given GSuite revenue is US $7B?
What is the revenue of Bing ?
How many computers does Google own?
How many cars are on 101 between San Francisco and Mountain View?
How many webcams were sold in the US during 2020?
How long does an average person wait at an intersection?
How long will you keep the traffic light green in order to allow 100 cars to pass through? (Assume a single lane road)
Estimate total storage capacity for all videos on Youtube.
How much revenue does your favorite restaurant makes each year?
How much storage data will YouTube need for the next year?
How many umbrellas are sold in a city when it rains?
Estimate the Number of Orders delivered by Swiggy per hour in India
Estimate the potential market share of Capital One Credit Wise.
How much does the US spend in dog food each year?
Assume the US Govt wants to provide free internet storage to all its citizens. Create a program to manage it and estimate the 3 year cost for the program.
Estimate the sale of colored TVs in Flipkart during diwali.
What is the size of the micro-mobility market in the United States?
Estimate the number of cars sold through cars24 since the first lockdown of COVID19 (March 2020).
Estimate the number of hours wasted in traffic each year.
Estimate the number of emails that the city of San Francisco receives.
Estimate the amount of storage needed to store all the photos and videos taken on Pixel phones.
How would you price a Tier 1 and Tier 2 Uber subscription?
Estimate the number of YouTube users.
Google Streetview data for San Francisco is lost. What's the cost to replace it?
How many bricks are there in New York?
Estimate the revenue of Netflix.
Estimate how much data YouTube delivers every day.
What is the size of the European Shoe market?
Estimate the sanitizer market in the USA.
Estimate the amount of money spent each year at movie theatres in the US.
How many calories are in a typical grocery store item?
How would you analyze the performance of Facebook in country X vs. country Y?
What is the decrease in percentage of cab rides in post covid times compared to pre covid times?
How would you identify all the potholes in the United States?
How many dollar bills are in circulation in the US?
Estimate the number of servers required for YouTube.
How many coffee shops are there in San Francisco?
Estimate the daily watch time of cooking videos on YouTube.
If you want to build the world's most popular mobile messaging product, how would you estimate how much network bandwidth would be used in a year?
How many reviews are left on Amazon on a given Monday?
Estimate the number of restaurants in Mumbai.
Estimate the number of millennial homeowners in India.
Estimate the total number of hours required for Americans to do their laundry every year.
Estimate the number of videos watched on YouTube per day.
Estimate the number of iPads sold in Europe in 2019.
Estimate the number of coconuts sold in India.
How many trains come in and out of Mumbai?
How many hexagons are there on a football?
How much does a driverless truck cost?
We want to improve Toronto Streetview. Google cars will drive in Toronto and take pictures. How long it will take?
How long would it take to empty a hot tub using only a drinking straw?
Assume you are the placement coordinator of a Tier-1 engineering college and it's the first day of placements. Inside the campus, there is a cafe. Estimate how many people have purchased coffee on that particular day.
Estimate the number of travelers in India per day.
Estimate the uptake of a new improved tool.
How many ride-share trips occur in the US daily?
Estimate the cost of running YouTube.
How many house contractors are there in the U.S.A.?
How much storage and bandwidth do we need for Google Drive service next year?
What are the network implications of a handheld device meant for elementary schools kids?
Estimate the aggregate number of miles joggers run in Central Park NY City in a year.
Imagine there are 10,000 people on Mars. The only way of communication to Earth is through Gmail. How much bandwith is needed?
How much bandwidth does the StarWars hologram use?
What is the market size for chess clocks in India?
How many elevators are there in a building?
How many computers does LinkedIn have?
How would you estimate the number of monthly users for Dropbox?
Estimate how many Zoom meetings take place over the course of the average week.
How many creators are there in India?
Pick your favorite city. How long would it take to get Google Street Views images for the entire city?
How many elevators are needed in a mall?
If the Philadelphia airport was to shutdown for 24 hours, how long would it take to get back to running like normal? Come up with number estimates and assumptions.
How many video game consoles are sold each year?
How many articles does the average American read in a month?
How many new cars were manufactured last year?
How many wheelchairs should an average hospital have?
Estimate the number of passengers per year in post-COVID world in August travelling from the US to the EU.
Estimate hardware costs per Google Photos user.
How do you go about calculating the TAM, SAM and Target Market for the food tech industry?
How would you determine how many trips are taken on the London Underground each year?
How much app related data does the Google iOS app store transmit each month?
How many hours do people spend on stoplight in the USA in a year?
Estimate the number of students and interns in and around New York.
An airport closed down for a day due to inclement weather. How long does it take to get caught up?
Estimate the number of hospital beds in the UK.
How would you estimate purchase order abuse in Amazon? How would you solve it?
How much does a school bus weigh?
How will you price Disney+ if it was launched today?
How many windows are there in New York City?
Quantify the number of linear road miles in Google Maps.
What is the Lifetime Value of an uber user?
Estimate the number of incidents that could be reported by users of Waymo in the SF Bay area.
Estimate the delta in the sale of hair trimmers/clippers during the COVID-19 lockdown.
If you were launching a bike sharing app in NYC, how many people would be interested in it?
Estimate the market share of Google Translator as an API.
One day, all of New York's Google Maps Street View is lost. What is the cost of rebuilding it?
To help you with your Product Manager interview preparations, we have compiled a complete list of the most asked Product Management Interview Questions and Answers at companies like Facebook, Google, Amazon, Microsoft, Netflix, etc. answered by PMs at FAANG.
Now get, Full Access to All PM Interview Questions and Detailed Answers by FAANG PMs for a Year! Get the Yearly Subscription now! 👇
Preferred Payment Methods:
Google Pay / PhonePe ₹4,999 to UPI Id - mypminterview@oksbi
Paypal $69 to mypminterview@gmail.com
Prices are about to go up soon! Now is the time to Subscribe! 👆
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