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Market sizing case: how many petrol stations are there in the US?

Case case study Market sizing
Neue Antwort am 17. Mai 2024
7 Antworten
61,4 T. Views
Anonym A fragte am 10. Mai 2017

How would you approach this case?

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Content Creator
antwortete am 12. Mai 2017
5+ Years at BCG & Kearney Dubai & Istanbul | 400+ Trainees | Free 15-min Consultation Call

Hi Anonymous,

As mentioned earlier, there are many different ways one can approach this problem. I typically approach this following way:

1. What is the total demand for gas stations?

2. What is the demand for one gas station?

3. -> Find the total number of gas stations

To start with number 1, while I have no idea about the real numbers, let's assume that population is 400M, and there is 1 car per 4 people. Thus we would have 100M cars.

Now we need to estimate the total demand for a day/week/year, let's go ahead with day. From my personal experience, I visit gas stations once every two weeks. Assuming this is the case for the entire population, 100M cars would visit gas stations every two weeks. This means that about 7M cars visit gas stations every day. -> This is the total demand.

Now we are at number 2, we need to understand the number of cars visit a gas station during one day. To keep it simple, we can assume (again, based on personal experience) that there are always 3 cars occupying the gas station for 5 minutes throughout 18 hours (and the remaining of the time, the gas station is empty). This would give us ~600 cars every day. -> This is the demand for one gas station.

We can find the number of gas stations by diving total demand (7M) by local demand (600), and reach ~12000 as our final answer.

I have quickly checked on google, and the real answer is about x10 higher than my answer. HOWEVER, it really is not important to get a precise answer to impress the interviewer. It is all about sharing your train of thought and laying out your assumptions very explicitly.

I hope this was helpful.

Have a good day,

Deniz Ahmet

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Rahul am 26. Dez. 2019

why did you ignore commercial vehicles?

Marin am 10. Apr. 2024

I did the following steps: USA population = 330 mil Number of vehicles = Private vehicles + company vehicles + state vehicles (police, army, ambulance, firefighters) PERSONAL VEHICLES CALCULATION - 1 household = 4 members -> aprox. 83 mil. households - 65% of households possess 1 car = 54 mil cars - 35% of households possess 2 cars = 2*83 mil.*0,35 = 58 mil cars - Number of personal vehicles = 54 mil + 58 mil = 112 mil vehicles COMPANIES VEHICLES CALCULATION - My assumption is that ratio between private and companies vehicles is 5:1 --> 20% - Number of companies vehicles = 112 mil *0,2 = 22,4 mil --> 22 mil vehicles STATE VEHICLES CALCULATION - My assumption is that ratio between private and state vehicles is 10:1 --> 10% - Number of state vehicles = 112 mil * 0,1 = 11,2 --> 11 mil vehicles Number of vehicles = (112+22+11)*mil= 145 mil Average volume of vehicle tank = 60 liters My assumption is that every vehicle is refuled twice a month which leads to the following monthly assumption of fuel = 2* Number of vehicles * Average volume of vehicle tank = 2*145 mil*60= 17,4 billion liters Every gas station is refuled 7 times a month (assumption) Number of cars per petrol station evetyday (assumption) = 600 cars Petrol tank(s) capacity for every petrol station = Number of cars per petrol station * average volume of vehicle's tank = 600 * 60 = 36 000 liters Number of Petrol station in USA = monthly assumption of fuel / (Gas tank(s) capacity for every petrol station*number of mohntly refulement for every petrol station) = 17,4 billion liters / (36 thousand liters *7)= 17,4 mil / 252 thousand = 69 047 petrol stations Answer: There are 69 047 petrol stations in USA Is this approach good or it is a little bit complicated? Thank you for your answer! :D


Content Creator
antwortete am 17. Mai 2024
#1 MBB Coach(Placed 750+ in MBBs & 1250+ in Tier2)| The Only 360 coach(Ex-McKinsey + Certified Coach + Active recruiter)

I'm glad you brought up this market sizing case. It's a classic case interview question that tests your structured thinking, quantitative skills, and ability to break down a complex problem into manageable components. Let me walk you through how I would approach it.

First, it's important to understand the context and the objective of the case. The interviewer is likely assessing your ability to size a market or estimate a figure using logical reasoning and data-driven assumptions. The key is to take a structured approach and communicate your thought process clearly.

Here's how I would tackle this case:

1. Clarify the question: Before diving into calculations, I would ensure that I understand the scope of the problem. In this case, I would ask for clarification on whether the question refers to the total number of petrol stations across the United States or a specific region or state.

2. Identify the key components: To estimate the number of petrol stations, I would break down the problem into smaller components that can be estimated individually. The main components could be:
a. Total population of the United States (or the specific region)
b. Average number of vehicles per household
c. Average fuel consumption per vehicle
d. Average capacity of a petrol station

3. Gather data and make assumptions: For each component, I would try to gather relevant data or make reasonable assumptions based on logical reasoning or industry knowledge. For example:
a. Total population: I could look up the latest census data or make an assumption based on general knowledge.
b. Average vehicles per household: I could use industry reports or make an assumption based on urban vs. rural demographics.
c. Average fuel consumption: I could use data from automotive associations or make an assumption based on average mileage and fuel efficiency.
d. Average capacity of a petrol station: I could research industry standards or make an assumption based on the typical size and throughput of petrol stations.

4. Calculate and sanity check: Once I have gathered the necessary data and made assumptions, I would perform the calculations to estimate the total number of petrol stations. This could involve dividing the total fuel demand by the average capacity of a petrol station.

5. Communicate and refine: Throughout the process, I would communicate my thought process, assumptions, and calculations to the interviewer. This allows them to understand my reasoning and provide feedback or additional information if needed. I would also be open to refining my assumptions or approach based on their input.

6.Consider additional factors: Depending on the interviewer's prompts, I might also consider additional factors that could impact the estimate, such as regional variations, urban vs. rural differences, or trends in alternative fuel vehicles.

Remember, the interviewer is not necessarily looking for a precise answer but rather assessing your problem-solving approach, quantitative skills, and ability to think logically and communicate effectively.

By breaking down the problem, making reasonable assumptions, and clearly communicating your thought process, you demonstrate the structured thinking and problem-solving abilities that consulting firms value highly.

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Content Creator
antwortete am 11. Okt. 2023
ex Jr. Partner McKinsey |Senior Interviewer| Real Feedback & Free Homework between sessions|Harvard Coach|10+ Experience

Hi there,

Population and Car Ownership: I would assume a population of approximately 330 million in the US. To estimate the number of cars, I would assume that, on average, there is one car for every 2.5 people. This would give us roughly 132 million cars in the US.

Daily Visit Frequency: I would assume that, on average, a car visits a petrol station every three days. This assumption is based on typical driving habits and the need for refueling.

Capacity of a Petrol Station: Assuming each petrol station can serve 500 cars in a day, given the number of fuel pumps and the station's operating hours.

By multiplying the number of cars by the visit frequency and dividing by the capacity of a petrol station, I can estimate the total number of petrol stations needed. Using these assumptions, the calculation would look like this:

(132 million cars / 3 days) / 500 cars per station per day = 88,000 petrol stations

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Jason antwortete am 10. Mai 2017
Case leader, MBB

There are infinite ways to size it so the following is by no means an exact answer. My preferred method would be to initially segment by locality, given that the drivers of demand for a petrol station are significantly different between rural areas and population centers.

Stations in rural areas are driven by the average range of a car when they need to refuel, so you could derive a number through the station density and area of America.

Stations in population centers are driven by the demand (i.e. the number of cars) in each city. I would actually segment this down further into Metropolises/Cities/Towns given the large difference in population size between them. Also, you would need to factor in that these stations are nowhere near running at full capacity.

I appreciate any feedback on this approach.

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Anonym B antwortete am 16. Mai 2017

I would think how many petrol stations are in a specific region. For example, you know that in the city you live in there are 6 petrol stations. Let's say the city has 30 000 people, so that results to about 5000 people per petrol station. US has about 300million people, so divide 300m/5000 and you get 60 000 petrol stations.

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Anonym bearbeitete die Antwort am 24. Dez. 2022

I like answer 1!

There are more detailed ways but I like this approach because you give a quick answer and then you can walk your interviewer how you refine these high-level assumptions.


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Content Creator
antwortete am 28. Mai 2020
McKinsey | Awarded professor at Master in Management @ IE | MBA at MIT |+180 students coached | Integrated FIT Guide aut


To add on top what´s been said, you can also do it from:

# vehicles > # liters each of them consume > averge need for a gas station.

You can also use 1 method and the 2nd one to proof it.



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Content Creator
5+ Years at BCG & Kearney Dubai & Istanbul | 400+ Trainees | Free 15-min Consultation Call
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