McKinsey Cases: Practice Cases and Worked Examples (2026)

McKinsey practice cases are worked interview simulations that replicate the format, pacing, and evaluation criteria of a real McKinsey interviewer-led case: you state a hypothesis in the first two minutes, work through interviewer-guided exhibits one at a time, and close with a tight synthesis. This page is a McKinsey case bank for 2026: four fully worked cases (retail profitability, EV charging market sizing, Southeast Asia market entry, and an M&A due diligence), each with a hypothesis, structure, calculation, and synthesis, plus a four-criteria rubric that maps to McKinsey's own public interviewing guidance. McKinsey publishes six official worked cases on its careers page; this article adds four more with full solutions and a scoring system so you can grade every rep.

The cases mirror the skills McKinsey describes on its careers page: structuring ambiguous problems, working through facts and data, forming conclusions, and articulating your thinking. Your exact interview timing and flow can vary by role, office, and round, so use your recruiter instructions as the source of truth.

The McKinsey case interview guide covers the format. This article is the case bank: worked examples, grading criteria, and a prep system.

A practical prep plan needs enough reviewed cases to make structure, math, and synthesis reliable. Your starting point, timeline, and feedback quality matter more than a universal volume target.

McKinsey practice case essentials

What makes McKinsey-style cases different?

Three features often separate McKinsey-style practice from other consulting firm cases. Your recruiter and interviewer remain the source of truth for the exact format of your round:

Interviewer-guided structure. McKinsey sample cases and candidate reports often involve the interviewer walking you through exhibits and specific sub-questions. Your job is to answer each one precisely while still showing initiative in your structure and synthesis.

Hypothesis-first framing. State a hypothesis within the first 2 minutes, before you see any data. It does not need to be correct. It signals structured thinking. You will refine or reject it as evidence arrives.

Structured handoff moments. McKinsey cases contain 2 to 3 points where the interviewer introduces new information. Each tests whether you can update your hypothesis and keep your structure coherent. Marc Cosentino's Case in Point (11th edition) calls this "the pivot": re-anchoring the analysis without starting over.

For a full format comparison, see the differences section below.

What are real McKinsey practice case examples?

The four cases below use an interviewer-guided McKinsey-style format. Read the prompt, build your structure for 2 minutes, then work through the suggested path and calculation. These mirror the style of top MBA consulting club casebooks (Harvard Business School Management Consulting Club Casebook 2024; Wharton Consulting Club Casebook 2024).

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Case 1: Retail profitability decline

Prompt: A national retail chain with 400 stores has seen operating margins fall from 12% to 7% over the past 3 years. Revenue is flat. The CEO wants to know why and what to do.

Hypothesis: "The margin decline is cost-driven rather than revenue-driven. Most likely driver: store-level operating costs or supply chain inefficiencies. I will test this by separating fixed versus variable cost trends."

Structure: Revenue (flat, not the driver). Costs: COGS and operating expenses. Within operating expenses: labor, rent, logistics, overhead.

Calculation moment: COGS held steady at 55% of revenue, but SG&A rose from 33% to 38%. On a $2B revenue base: 5pp x $2B = $100M additional cost. That fully accounts for the 5-point margin drop.

Synthesis: "The margin decline is a $100M SG&A problem. Labor and occupancy are the primary candidates. I recommend a labor scheduling audit and lease renegotiation review. A 10% labor efficiency improvement at $2M per store would recover $80M."

For a deeper look at profitability frameworks, see the profitability framework guide.

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Case 2: Market sizing for EV charging stations

Prompt: A private equity firm is evaluating an investment in a U.S. EV charging network. Estimate the total addressable market for public Level 2 charging stations in the United States today.

Hypothesis: "I will build bottom-up from U.S. EVs that rely on public charging, then estimate sessions per station to derive implied station count and market revenue."

Structure and calculation: 4M EVs on the road x 40% relying on public charging = 1.6M vehicles x 6 sessions/month = 9.6M sessions/month. One Level 2 station handles roughly 240 sessions/month. 9.6M / 240 = 40,000 stations. At $2,400/station/year in revenue: 40,000 x $2,400 = $96M. Department of Energy figures peg the range at $100M to $200M, so this estimate is at the low end but directionally sound.

Synthesis: "The Level 2 public charging market is roughly $100M to $200M, currently supply-constrained. The investment thesis depends on whether charging fees or real estate monetization drives returns. At current utilization, charging economics alone are thin."

For more practice with this structure type, see the market sizing framework guide.

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Case 3: Market entry into Southeast Asia

Prompt: A U.S. mid-market software company with $500M in revenue wants to enter Southeast Asia. They have no regional presence. Advise them on whether to enter and, if so, how.

Hypothesis: "Entry is viable. The method matters more than the timing. I will test market attractiveness, competitive intensity, and product-adaptation requirements before recommending an entry mode."

Structure: Market attractiveness (TAM, growth, willingness to pay), competitive landscape, company fit (localization, regulatory exposure, capital), entry mode (greenfield, acquisition, partnership).

Calculation moment: $8B SaaS spend x 12% U.S. share x 5% company capture = $48M today. At 18% CAGR over 3 years: $13.2B x 12% x 5% = roughly $79M.

Synthesis: "Entry is warranted. The 3-year opportunity is $48M to $79M and growth favors early movers. I recommend a partnership entry in Singapore as a regional hub, with $5M to $8M for product localization. Greenfield in Indonesia or Vietnam is a year-three decision."

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Case 4: M&A target evaluation

Prompt: A large consulting firm is considering acquiring a mid-size analytics software company for $180M. The target has $30M in revenue and $4.5M in EBITDA. Should the acquirer proceed?

Hypothesis: "The acquisition is strategically sound if cross-sell synergies can bring the effective multiple below market. At 6x revenue today the price is full. I will test whether synergies justify the premium."

Structure: Strategic fit (capability gap?), financial assessment (multiple, synergy potential, integration cost), risk (talent retention, tech integration).

Calculation moment: Acquirer expects $6M in annual synergies ($3.5M cross-sell + $2.5M cost savings). Post-synergy EBITDA: $4.5M + $6M = $11M. Effective multiple: $180M / $11M = 16.4x EBITDA. Revenue multiple: $180M / $33.5M = 5.4x. Both exceed market average for analytics software (roughly 12x EBITDA, 4x revenue).

Synthesis: "The price is full. Proceed only if the acquirer can negotiate to $150M to $155M, which brings post-synergy EBITDA to roughly 13x. Alternatively, evaluate whether a licensing partnership captures 60% of the strategic benefit at a fraction of the cost."

For a framework to structure M&A cases, see the M&A case framework guide.

What types of cases does McKinsey ask?

McKinsey cases cluster around five types, based on casebook data and candidate reports from top MBA programs (Harvard Business School Management Consulting Club Casebook 2024).

Profitability (30 to 35%). The most common type. A client's margins are falling. You decompose the P&L, isolate the driver, and size the fix. Almost always includes a calculation moment.

Market sizing (15 to 20%). Estimate a market or revenue opportunity. McKinsey uses these to test structured estimation under ambiguity. Hypothesis and bottom-up build expected.

Market entry (20 to 25%). A client wants to expand into a new geography or segment. You evaluate attractiveness, competitive dynamics, and feasibility.

M&A and due diligence (10 to 15%). Strategic rationale, synergy math, valuation sense-checks. More common in final rounds and for experienced-hire candidates.

Operations and cost reduction (10 to 15%). A plant or supply chain needs to cut costs or improve throughput. Typically includes a capacity or process calculation moment.

McKinsey's interviewing page notes that problem-solving interviews present a typical client scenario to evaluate analytical thinking and approach to solving complex problems, rather than industry memorization.

Market sizing shows up in roughly one in five McKinsey cases and is the fastest type to drill on its own. Build and defend one estimate live, then get AI feedback on your assumptions:

How does McKinsey grade a practice case?

McKinsey does not publish a universal scoring sheet for every office and role. For practice, score yourself on four dimensions that map to McKinsey's public guidance and common interviewer feedback:

Structure quality. Did you open with a hypothesis? Was your framework MECE and specific to the problem, not a generic 4-box? Did you adapt when new data arrived?

Math accuracy and speed. Did you set up the calculation correctly? McKinsey interviewers report that a correct setup with a wrong number gets more credit than a right number with no visible logic.

Synthesis clarity. A 60 to 90 second recommendation, specific and data-backed. Synthesis is graded separately from the analysis. Many candidates who ace the analysis lose points by hedging or running long.

Communication under pressure. Did you stay calm on hard numbers? Ask for a moment to think rather than filling silence with noise? Respond to redirects without losing your structure thread?

McKinsey's exact evaluation process can vary by role and recruiting process. Treat each round as a fresh performance and ask your recruiter if you need clarity on format or next steps.

The fastest way to see where you land on these four dimensions is to run a full case and have it scored. This margin-recovery case walks the same structure, math, and synthesis loop the rubric above grades:

How should you practice McKinsey cases at home?

The plan below builds to 15 to 25 full cases in 4 weeks and uses Road to Offer drills to repair weak points between full mocks.

Week 1: Format first. Read the McKinsey case interview guide and Case in Point chapters on structure and synthesis. Run 3 solo timed cases from this article or the case interview examples library. No partner practice yet.

Week 2: Drill the weak spots. Use Road to Offer structure drills for 10 to 15 opening prompts (2 minutes each, hypothesis first). Run daily math sets with the math practice tool. Add 4 to 5 more full cases.

Week 3: Partner practice. Run 6 to 8 partner cases from the free consulting case books vault (the Wharton and Booth casebooks have McKinsey-style formats). Debrief each case on the 4 grading dimensions. Score your synthesis: under 90 seconds, specific, data-backed.

Week 4: Full simulation. Run 4 to 6 mock cases under real interview conditions with no notes visible. Focus on handoff moments: can you update your hypothesis in 30 seconds when redirected? Prepare the PEI component in parallel using the McKinsey PEI guide.

What is the difference between McKinsey practice cases and BCG or Bain cases?

The three firms test the same core skills through different formats. Prep that works for one firm can create bad habits for another.

The most common cross-prep mistake: drilling Bain's candidate-led format and then being passive in a McKinsey room, waiting for a signal to drive. McKinsey-style practice should force an early hypothesis and structure. The interviewer may direct from there, but initiative still has to show.

For firm-specific guides, see the BCG case interview guide and Bain case interview guide.

Sources

• McKinsey Careers: Interviewing at McKinsey. https://www.mckinsey.com/careers/interviewing. Verified 2026-04-28.
• LockedInAI: How to Break Into McKinsey in 2026: Interview & Case Guide. https://www.lockedinai.com/blog/break-into-mckinsey-interview-case-guide. Verified 2026-07-23.
• Harvard Business School Management Consulting Club Casebook 2024. https://www.hbs.edu/mba/student-life/activities-government-and-clubs/student-clubs/management-consulting-club. Verified 2026-04-28.
• Wharton Consulting Club Casebook 2024. https://www.whartoncoinsultingclub.com. Verified 2026-04-28.
• Marc Cosentino. Case in Point: Complete Case Interview Preparation, 11th edition. Burgee Press, 2023.
• Vault Guide to the Top 50 Consulting Firms, 2025 edition. https://www.vault.com/best-companies-to-work-for/consulting. Verified 2026-04-28.
• IGotAnOffer McKinsey Case Interview Preparation Guide 2025. https://igotanoffer.com/blogs/mckinsey-case-interview-blog/115672708-mckinsey-case-interview-preparation-the-only-post-youll-need-to-read. Verified 2026-04-28.