Hi all, I would like to seek your advice on what are the suitable options for practicing market sizing drills?
I am looking for resources that provides wide variety of market sizing drills which is practical and provides solution.
I have tried: PrepLounge (doesn't seem to have a market sizing bank) and crafting cases (have done most exercises). Haven't tried Case Coach - heard it is a good one.
Please share your thoughts, thanks!
Hi there,
If you’re specifically looking for market sizing drills with full, well explained answers, you’re already on the right track.
Personally, I also recommend CraftingCases as the strongest starting point. The market sizing exercises there are realistic, cover a wide range of industries, and the solutions actually explain the logic step by step instead of just giving a number. That’s exactly what you want for interviews.
Beyond that, a few solid additions:
CaseCoach is worth trying if you want more volume. Their market sizing drills are structured and consistent, although some solutions are a bit more “formulaic” and less discussion based than CraftingCases. Still useful for repetition and speed.
Victor Cheng’s market sizing videos and drills are good for learning clean approaches and sanity checks. Less variety, but very strong fundamentals.
BCG Interactive Case examples and older MBA casebooks can be surprisingly helpful for market sizing practice. You won’t always get perfect solutions, but forcing yourself to benchmark and sense check your answers is part of the training.
One practical tip: once you’ve done most written drills, start creating your own market sizings from real life. For example size contactless payments in your city or EV chargers in a country. Write your approach, calculate, then sanity check against public data. That’s very close to interview reality.
If you’ve already done most of CraftingCases, you’re likely at the point where how you structure and communicate matters more than finding new question types. That’s usually where candidates benefit from targeted feedback rather than more drills.
That is a smart pivot. Practicing pure market sizing is often overlooked, but it's a huge component of the early interview rounds—recruiters use it to test how quickly you establish a logical structure and handle assumptions under pressure.
Here is the reality check: you don't need a massive bank of market sizing problems. Once you've done 15-20 solid, varied drills, the key is not seeing new scenarios but mastering how to adapt the core structures (e.g., demand-side penetration, supply-side capacity, proxy/anchor method) to any absurd topic. If you can size the annual revenue of a specific McDonald's store, you can size the market for electric scooters in Southeast Asia.
For dedicated resources, Case Coach is indeed excellent for its highly structured, concise examples—it teaches the methodology more than just providing answers. A fantastic, overlooked resource is actually the Economist's "The World in..." annual publication or similar analyst reports. Take a real-world, obscure product mentioned (say, autonomous underwater vehicles) and force yourself to size that market using a top-down and a bottom-up approach, referencing real global statistics (GDP per capita, population density) as your core inputs. This develops the skill of making practical assumptions, which is where most candidates fail.
Stop chasing volume and start perfecting your structure. Get fast and clean on the structure, and the number will follow.
All the best!
