Published 7 min read
What Is Management Consulting? A Former McKinsey Interviewer Explains
Management consulting is a service where outside firms are paid to solve a specific business problem for a client, usually strategic or operational, in a fixed window of time. A team of consultants gathers data, interviews stakeholders, builds a structured analysis, and delivers a recommendation the client's own executives did not have the time, distance, or internal political room to produce themselves. Firms range from global generalists like McKinsey, BCG, and Bain to boutiques that only touch one industry. The work is billed by the project, not the hour.
I spent years on the McKinsey side of this, reading resumes in batches of 400 and running interviews for people trying to get in. Most candidates I talked to had a fuzzy idea of what the job actually was. They knew it paid well and sounded impressive at a dinner party. Few could explain what a consultant does on a Tuesday. So before we get into how to break in, let's get the actual job straight.
What a management consultant does, day to day
A consulting engagement, often called a project or a case, starts with a client problem: revenue is flat, a merger needs an integration plan, a factory network needs redesigning, a company wants to enter a new market and does not know if it should. The firm staffs a small team, usually a partner who owns the client relationship, a manager who runs the day-to-day, and two to four consultants or analysts who do the analysis.
The daily work is less glamorous than the recruiting brochures suggest. It is building models in spreadsheets, running dozens of stakeholder interviews, reading industry reports nobody else wants to read, and turning messy inputs into a slide that says one clear thing. A junior consultant might spend a week just getting comfortable with a client's internal data before they produce a single insight worth showing a partner. The job rewards people who can take a pile of ambiguous information and find the one lever that matters, then say it in a sentence a busy executive can act on.
Engagements typically run 8 to 16 weeks, though transformation work can stretch to a year or more. At the end, the team presents a recommendation, and often the client asks the same firm to come back and help implement it. That implementation relationship is where a lot of the real revenue lives, not the initial diagnostic phase.
The different tiers of consulting firms
Not all consulting is the same, and the tier matters for pay, prestige, and the kind of work you will actually do.
| Tier | Examples | What they mostly do |
|---|---|---|
| MBB | McKinsey, BCG, Bain | High-level corporate strategy, CEO-facing problems, market entry, transformation |
| Big Four advisory | Deloitte, PwC, EY, KPMG | Strategy plus a much larger base of implementation, audit-adjacent, and technology work |
| Boutique strategy | LEK, Oliver Wyman, Kearney, industry-specific firms | Deep expertise in one sector, like healthcare, private equity diligence, or energy |
| In-house strategy teams | Corporate strategy divisions at large companies | Internal advisory, smaller scope, no external client, often a landing spot after a few years at a firm |
MBB firms are the most selective and the most strategy-focused. Big Four advisory arms hire far more people per year and touch a wider range of work, from strategy to systems implementation. Boutiques trade breadth for depth in one industry. If you are trying to figure out which of these paths fits you, I go through the tradeoffs in detail in MBB vs Big Four consulting.
How consulting firms actually make money
Clients do not pay by the hour. They pay a fixed or near-fixed fee for the engagement, calculated off the number of consultants staffed and the number of weeks the project runs. A typical MBB project with a partner, a manager, and three consultants running for twelve weeks can bill well into seven figures. That fee structure is why firms are careful about staffing, every week a consultant spends on a project is a cost against the fee, and why the work moves fast: a slow team eats the firm's margin.
This is also why the industry is described, per publicly reported estimates for the mid-2020s, as a market worth several hundred billion dollars globally, with growth driven by demand for AI implementation advice, cost transformation work during uncertain economic stretches, and the ongoing need for outside validation on big corporate bets. Estimates vary widely depending on what counts as management consulting versus adjacent IT and audit services, so treat any single number you see quoted online as one firm's definition, not gospel.
Who gets hired, and what the job actually tests for
Firms hire from two main pools: undergraduates and MBAs, plus a smaller stream of experienced hires with deep industry or functional expertise. The recruiting process does not test what you studied. It tests four things: whether you can structure an unfamiliar problem, whether you can do clean math under time pressure, whether you can communicate a conclusion the way an executive wants to hear it, and whether you have led something with a real result behind it.
This is why chemical engineers, physicists, and history majors get hired at the same rate as finance majors, once you control for how well they prepare. I came in with a chemical engineering background and zero business coursework, and it was never the gap people assume it is. The screen cares about how you think, not what your transcript says. If your background is nontraditional and you are worried it will hold you back, that is worth reading in consulting interview prep for non-business majors, because the fix is about framing, not about retraining.
The interview itself is built around the case interview, a live simulation of the actual job: you get a business problem you have never seen, and you have to structure it, work the numbers, and deliver a recommendation out loud, in real time, in front of someone who does this for a living. If you have never sat through one, what is a case interview walks through the format end to end.
What the career path and pay actually look like
Consulting runs on an up-or-out model. You start as an analyst or associate, get promoted every one to two years, and are expected to keep climbing toward manager, then principal, then partner, or you are counseled out. Not everyone wants to make partner, and firms know it. Most people who leave after two to four years do so on purpose, using the analytical training and the brand name to move into private equity, corporate strategy, tech operating roles, or an MBA program.
Pay at MBB firms for entry-level hires runs roughly in the low six figures in base salary, per recent publicly reported compensation surveys, before bonus, with all three firms landing close enough to each other that the differentiator is usually the work and the office, not the paycheck. Post-MBA hires and experienced hires enter at meaningfully higher bands. These numbers move most years and differ by office and country, so confirm current figures on the firm's own career site before you build a decision around them.
The hours are real. Client-facing weeks can run long, travel is common at some firms and rare at others depending on practice area, and the intensity is part of why the pay is high relative to years of experience. Nobody I worked with thought the job was easy. Most thought it was worth it for a defined stretch of years, not necessarily forever.
The bottom line
Management consulting is a business built on being hired to think clearly and fast about someone else's hardest problem, for a fee, on a deadline. The firms differ in prestige, industry focus, and pay, but the underlying skill they are all buying is the same: structured thinking, clean analysis, and the nerve to tell a room full of executives what they need to hear. If you are trying to break in, understanding what a case interview actually tests is the fastest way to stop guessing and start preparing for the real thing.
Go deeper
Once you understand what the job is, the next question is whether your resume and your case skills would survive the actual screen. The free module is a good place to find out.
Get the complete Cut to the Case course →
One payment, lifetime access, 30-day guarantee.
Frequently Asked Questions
What is management consulting in simple terms?
It is a service where a company pays an outside firm to solve a specific business problem, like flat revenue or a merger integration, over a fixed project timeline. A small team gathers data, builds analysis, and delivers a recommendation the client could not easily produce with its own staff.
What is the difference between management consulting and other consulting?
Management consulting focuses on strategic and operational decisions at the top of a company, like growth strategy or organizational design. Other consulting fields, like IT consulting or financial audit advisory, focus on narrower technical or compliance work, though large firms often offer both under one roof.
Do you need a business degree to get into management consulting?
No. Firms hire heavily from engineering, sciences, and liberal arts backgrounds because the interview tests structured thinking and communication, not memorized business content. A nontraditional background is a framing challenge, not a disqualifier.
How much do management consultants get paid?
Entry-level pay at top firms runs roughly in the low six figures in base salary as of recent publicly reported compensation data, before bonus, with post-MBA and experienced hires entering at higher bands. Figures shift by firm, office, and year, so check the firm's own career site for current numbers.
What does a typical management consulting project look like?
A team of three to five consultants works a client problem for roughly 8 to 16 weeks, running interviews, building analysis, and presenting a recommendation to leadership. Longer transformation projects can extend past a year, often with the same firm brought back to help implement what it recommended.
Is management consulting a good career?
It suits people who like fast-paced problem solving and want strong analytical training early in a career, and most people treat it as a two to four year stretch rather than a lifetime path. The exit opportunities into private equity, corporate strategy, and operating roles are a major part of the appeal.