A case interview is a job interview format where candidates analyze and solve real business problems in real-time, demonstrating their analytical thinking, structured reasoning, and communication skills. Top consulting firms like McKinsey, BCG, and Bain use case interviews as their primary evaluation method. Case interviews are typically the dominant component, weighted 50-70% of the hiring decision depending on the firm — paired with fit/behavioral questions (30-50%) and online assessments, which serve as a gate rather than a scored input into the offer decision.
| Also known as | Case study interview, consulting case, business case |
| Used by | McKinsey, BCG, Bain, Deloitte, Accenture, and 100+ other consulting firms |
| Duration | 25-35 minutes per case (45 min at McKinsey when PEI is bundled) |
| Typical prep time | 4-8 weeks (50-100 hours total) |
| Pass rate | ~10-15% of applicants receive offers at MBB firms |
A case interview simulates the work consultants do on client engagements. The interviewer presents a business scenario - for example, "Our client is a retail chain whose profits have dropped 20% over the past year. What should they do?" - and you work through it collaboratively.
Unlike traditional interviews that focus on past experiences, case interviews evaluate how you think in real-time. There's no single "right" answer. Interviewers care more about your approach: Do you ask clarifying questions? Do you structure your analysis logically? Can you do math under pressure? Can you synthesize findings into a clear recommendation?
Case interviews originated at McKinsey in the 1950s and have become widely adopted in consulting interview coaching. Today, virtually every strategy consulting firm uses them, along with many corporate strategy teams, private equity firms, and tech companies for PM roles.
Important distinction:McKinsey uses an "interviewer-led" format where they control the pace and direct you to specific analyses. BCG and Bain use a "candidate-led" format where you drive the case yourself. The core skills are the same, but the feel is different.
| Case Type | Example Prompt | Frequency |
|---|---|---|
| Profitability | "Our client's profits dropped 15%. Why?" | 30-40% |
| Market sizing | "How many EV charging stations are in Germany?" | 20-25% |
| Market entry | "Should our client enter the Brazilian market?" | 15-20% |
| M&A | "Should our client acquire this competitor?" | 10-15% |
| Pricing | "How should we price this new product?" | 5-10% |
Prompt:"Your client is a regional coffee chain with 50 locations. Over the past year, profits have declined by $2 million. The CEO wants to know why and what to do about it."
Your approach:You'd break profit into revenue and costs. Revenue = Price × Volume. Costs = Fixed + Variable. You'd ask questions to isolate where the problem is, analyze data the interviewer provides, and recommend actions based on your findings.
What they're evaluating: Can you structure the problem? Do mental math accurately? Draw insights from data? Communicate clearly? Arrive at a defensible recommendation?
A case interview is a job interview where you solve a business problem out loud. The interviewer presents a scenario (like "profits are down 20%") and you work through it together, showing your analytical thinking in real-time.
Consulting firms use case interviews because they simulate actual consulting work. They test problem-solving ability, structured thinking, quantitative skills, and communication - the core skills needed on client projects.
A typical case interview lasts 25-35 minutes. At McKinsey the session can run about 45 minutes when the PEI is bundled with the case. BCG and Bain cases typically run 30-35 minutes with fit questions woven in.
Common case types include: profitability cases (why are profits down?), market sizing (how big is the market for X?), market entry (should we enter this market?), M&A (should we acquire this company?), and pricing (how should we price this product?).
Prepare by: (1) learning frameworks for common case types, (2) practicing mental math daily, (3) doing 20-30 practice cases with feedback, (4) developing structured thinking habits, and (5) practicing explaining your reasoning out loud with voice-based practice.
Get realistic voice-powered case practice with instant feedback on your structure, math, and communication.
Start PracticingLast updated: April 22, 2026