McKinsey Practice Cases: 15+ Worked Examples for Prep (2026)

McKinsey practice cases are 30 to 45 minute hypothesis-led case interviews that mirror the real format: a structured business problem, interviewer-led handoff, 1 to 2 quantitative drill points, and a final synthesis (McKinsey Careers 2026). This guide gives you 4 fully worked McKinsey-style cases, the firm's grading rubric, and a 4-week prep plan.

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

Across McKinsey-style case sessions on Road to Offer's AI case practice, candidates who score 7 or higher have typically worked through 15 to 25 full cases. That is the volume floor. Fewer reps and the structure muscle is not automatic by interview day.

TL;DR: McKinsey practice cases

• McKinsey cases run 30 to 45 minutes and follow an interviewer-led, hypothesis-driven format across 4 case types.
• The 4 most common types are profitability, market sizing, market entry, and M&A, each requiring a stated hypothesis within the first 2 minutes.
• McKinsey interviewers grade on 4 criteria: structure quality, math accuracy, synthesis clarity, and communication under pressure.
• Candidates who score 7 or higher have typically completed 15 to 25 full practice cases before their interview date.
• Road to Offer's AI case practice delivers real-time feedback on structure, math, and synthesis with no live partner needed.

What are McKinsey practice cases?

McKinsey practice cases replicate the format, pacing, and evaluation criteria of a real McKinsey interview. McKinsey publishes worked examples on its careers page to show candidates what to expect (McKinsey Careers 2026).

Three features separate McKinsey cases from other consulting firm cases:

Interviewer-led structure. The McKinsey interviewer controls the flow, walks you through exhibits one at a time, and asks specific sub-questions. Your job is to answer each one precisely, not to drive the whole conversation.

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 the McKinsey interviewer-led 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 cases test "problem-solving, analytical skills, and ability to structure and communicate insights" rather than industry knowledge (McKinsey Careers 2026).

How does McKinsey grade a practice case?

McKinsey interviewers score on four dimensions consistently across offices and rounds (Vault Guide to Consulting 2025; IGotAnOffer McKinsey Preparation Guide 2025).

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 uses a pass/fail gate at each stage. Each round is evaluated independently with no partial-credit carry (McKinsey Careers 2026).

How should you practice McKinsey cases at home?

The plan below builds to 15 to 25 full cases in 4 weeks.

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 the case structure builder to practice opening structures for 10 to 15 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 (HBS, 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 expects a hypothesis and structure in the first 2 minutes. The interviewer directs from there, but initiative must show first.

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

Frequently Asked Questions

How many cases should I practice before a McKinsey interview?

15 to 25 full cases is the volume floor. Below 15, the structure muscle is not automatic under pressure. Above 25, marginal gains decrease unless you are targeting specific weaknesses. Quality counts: a 20-minute debrief is worth more than two cases without feedback.

Where can I find free McKinsey practice cases?

McKinsey's careers page (mckinsey.com/careers/interviewing) has 4 worked cases with video walkthroughs. The free consulting case books vault on Road to Offer has 6 MBA casebooks (HBS, Wharton, Booth, INSEAD, Yale, Columbia) with McKinsey-style cases. The 4 worked examples in this article are calibrated to the same format.

Are McKinsey practice cases harder than BCG or Bain cases?

Not harder, but differently structured. McKinsey is interviewer-led and expects a hypothesis in the first 2 minutes. BCG and Bain are more candidate-led. Candidates who prep for one format only are often caught off-guard by the other. Difficulty is roughly comparable across firms at the same round.

What is the time limit for a McKinsey case?

30 to 45 minutes: roughly 2 to 3 minutes for structure, 20 to 25 minutes of interviewer-guided analysis, and 3 to 5 minutes for synthesis. The PEI adds 10 to 15 minutes before the case. Total interview time is 45 to 60 minutes.

How do I know if I am ready for a real McKinsey case interview?

Check four things after three consecutive timed cases: (1) Did you open with a hypothesis? (2) Did you hit the math with a clean setup? (3) Did you synthesize in under 90 seconds with a specific recommendation? (4) Did you handle redirects without losing your structure thread? All four yes across three cases in a row means you are ready.

Does McKinsey use the same cases at every office?

No. Case content varies by office, interviewer, and round. First-round cases are more analytical; final-round cases add ambiguity and senior-judgment moments. The format (interviewer-led, hypothesis-driven) is consistent globally. Do not try to memorize case topics by office. Focus on format and the four grading dimensions.

Sources

• McKinsey Careers: Interviewing at McKinsey. https://www.mckinsey.com/careers/interviewing. Verified 2026-04-28.
• Harvard Business School Management Consulting Club Casebook 2024. https://www.hbs.edu/mba/student-life/organizations/clubs/Pages/consulting.aspx. 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. Verified 2026-04-28.