Consulting intern interviews are mostly case interviews plus fit questions. In a case you are given a business problem, such as falling profits or a market entry decision, and you structure it, ask for data, do quick math and give a recommendation. Market sizing questions test whether you can estimate a number from reasoned assumptions. Large firms often add an online test or game first, and McKinsey's Solve is the best-known example. This page covers the rounds to expect, the questions that come up with what a strong answer contains, two sample answers, what interviewers expect from an intern, the mistakes that cost offers, and a two-week prep plan.
What the consulting intern interview looks like
| Round | What happens | How to prepare |
|---|---|---|
| Application and online test | Résumé screen; at some firms an online problem-solving test or game | Do the firm's official practice material, if any, and timed math drills |
| First round | Usually two interviews, each with a case and fit questions, often 30 to 45 minutes | Twenty or more live practice cases with a partner |
| Final round | Two or three interviews with more senior consultants, harder cases and deeper fit questions | Practice synthesis: a clear recommendation in under a minute |
| Offer and timing | Formats differ by firm, office and year | Confirm the format and dates with the recruiter or careers page |
Questions that come up, and what strong answers contain
- Our client's profits fell 20 percent. Why? Split profit into revenue and costs, revenue into price and volume, costs into fixed and variable, ask for data on each branch, find the driver and recommend action.
- How many electric scooters are rented in a city of one million people each day? A stated approach (top-down from population or bottom-up from fleet size), clear assumptions, clean arithmetic, a sanity check and a short comment on what drives the number.
- Should a coffee chain enter a new country? Market attractiveness, competition, the client's capabilities, economics of entry and risks, ending with a yes or no and conditions.
- Here is a chart. What does it tell you? The headline first, then the detail that supports it, then what it means for the client's question.
- Calculate the break-even volume. Fixed costs divided by contribution margin per unit, done aloud with units, then interpreted.
- Tell me about a time you led a team. Fit stories are scored too: your role, the obstacle, how you moved people and the result. Firms often focus on leadership, impact and collaboration.
- Why consulting, and why this firm? A real reason, specific people or practice areas you learned about, and the kind of problems you want to work on.
Two sample answers
How many electric scooters are rented in a city of one million each day?
I'll go top-down. Assume about seventy percent of the million are between 16 and 65, so roughly 700,000 potential riders. If one in twenty uses a scooter in a typical week, that's 35,000 weekly riders, and if each rides about three times a week, that's about 105,000 trips a week, or roughly 15,000 a day. As a sanity check, with a fleet of 3,000 scooters that's five trips per scooter per day, which feels plausible. The biggest swing factors are weather and how dense the city centre is.
Our client's profits fell 20 percent. Why?
I'd like to confirm the goal: understand the cause and recommend how to recover profit. I'll split profit into revenue and costs. On revenue, I'd look at price and volume by product and customer segment; on costs, fixed and variable, and whether any line grew faster than sales. Could I start with revenue over the last three years by segment? If volume is flat but price fell in one segment, I'd ask whether a competitor entered and then look at options: hold price, cut costs to serve, or exit the segment.
What interviewers expect from an intern
- A structure that is tailored to the problem, not a memorized framework.
- Fast, accurate mental math said out loud.
- Hypothesis-driven thinking: you say what you expect to find and test it.
- Polished fit stories, since many firms weigh them alongside the case.
For the full-time version of these questions, see what a case interview is.
Mistakes that cost offers
- Forcing a stock framework onto a case it does not fit.
- Doing math silently, or rounding so heavily the answer changes.
- Ending without a clear recommendation.
- Preparing cases but neglecting the fit interview.
A two-week prep plan
- Days 1 to 3: learn case structure and practice profitability and market entry cases out loud.
- Days 4 to 5: market sizing every day, top-down and bottom-up, with a sanity check each time.
- Days 6 to 8: mental math drills: percentages, growth rates and break-even.
- Days 9 to 11: live cases with a partner, two a day, alternating interviewer and candidate.
- Days 12 to 14: three fit stories per theme (leadership, impact, teamwork) and two mock interviews.
Timing matters as much as preparation: see our internship recruiting timeline, and once you are in, turning an internship into a return offer. Before the last round, prepare your questions to ask at the end of an intern interview.
Where CoPilot Interview fits
Intern interviews reward clear explanations of your own projects and coursework, and that takes practice out loud. CoPilot Interview is an AI interview assistant; its free AI mock interview builds consulting intern questions from your résumé and the job description, reads them aloud, scores each spoken answer out of ten and shows a model answer to compare. The free plan gives 15 minutes a day of live help in sessions of up to 15 minutes, with AI mock interviews included, with no card, which suits a student budget. For real interviews and online assessments, follow your employer's rules.
Disclosure: CoPilot Interview is our product, so weigh what we say about it accordingly.
Frequently asked questions
When does consulting internship recruiting happen?
Earlier than many students expect. Career offices and coaching sites reported in 2026 that some large firms moved US undergraduate internship applications to the winter or spring of sophomore year, more than a year before the internship. It varies by firm, office and year, so confirm on each firm's careers page.
How many practice cases should I do?
Candidates commonly report doing twenty to fifty live cases before final rounds; quality of feedback matters more than the count.
What is a case interview, exactly?
A business problem worked through with the interviewer. Our explainer on <a href="/blog/what-is-a-case-interview">what a case interview is</a> covers the format, and you can practice with <a href="/consulting-interview-help">our consulting interview guide</a>.
Can I use AI tools during an internship interview?
Only where the instructions allow it. Online assessments and many live rounds forbid outside help. Use AI to practice beforehand, and follow your employer's rules.
Practice this interview before the real one
The AI mock interview builds questions from your resume and the job description, reads them aloud and scores each spoken answer out of 10. Included on the free plan.
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