McKinsey Interview Prep: formula cheat sheet ?

Actively preparing for interviews with McKinsey Case Interview McKinsey
Recent activity on Oct 18, 2021
5 Answers
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Anonymous A asked on Oct 17, 2021

Hello all,

As I am preparing for my McKinsey interviews, are there any formula “cheat sheets” available to become more familiar with useful formulas to use during the case interview, etc?

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Udayan
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Content Creator
replied on Oct 18, 2021
Top rated MBB coach with many offers /Ex McKinsey EM in New York /6 years McKinsey recruiting experience/Real cases

There is no one formula cheat sheet. The entire point is to have you prepare for a new type of problem in an interview. Practice is key, and the following are some mathematical concepts that would be helpful to have.

 

  • Interest rates
  • Compound margin
  • NPV
  • CAGR 
  • The "Rule of 72"

Additionally, practice the following to ensure efficiency and ease:

  • Fast multiplication, especially for larger numbers
  • Multiplication tables up to 15
  • Fast division
  • Order of magnitude calculations
  • Ratios/Proportions
  • Profit/Breakeven

Best,

Udayan

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Moritz
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updated an answer on Oct 19, 2021
ex-McKinsey Experienced Hire | official McKinsey Interview Coach & Interviewer | ESADE MBA | Master of story telling

Consulting math in general is really quite simple in terms of “formulas”. It´s just a matter of dealing with the stress when, let´s say, subtracting two large numbers with appropriate rounding and keeping track of decimal places.

What you will need is two things:

  • Practice structuring i.e. establishing your “own formulas” based on the case problem. It´s all basic arithmetic but still plenty of ways to go wrong with too little practice
  • Practice your consulting/mental maths (plenty of tools online) and learn how to communicate clearly your approach as you´re executing

Hope this helps, best of luck!

(edited)

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Florian
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replied on Oct 18, 2021
#1 rated McKinsey Case and PEI Coach | 5 years at McKinsey | Mentorship Approach | 520+ McK interviews in 2021

Hey there,

My suggestion would be to practice case math drills and keep notes on the different formulas you encounter. At a certain point, you will see how they are used and repeated across cases.

That way you learn and internalize formulas and their practical application rather than learning formulas by heart without context.

The outcome will be significantly different.

Cheers,

Florian

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Ian
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replied on Oct 18, 2021
BCG | 100% personal interview success rate (8/8) and 95% candidate success rate | Personalized interview prep

Hi there,

Absolutely! I provide a math sheet for all of my candidates when I create their tailored preparation plan. Feel free to shoot me a message!

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Antonello
Expert
Content Creator
replied on Oct 18, 2021
McKinsey | MBA professor for consulting interviews

Hi!

I'm not sure what formulas you're referring to.

There are several articles here on PrepLounge on Consulting Maths - have a look at them and check if you can find your answer.

Hope this helps.

Best,

Anto

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Udayan gave the best answer

Udayan

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Top rated MBB coach with many offers /Ex McKinsey EM in New York /6 years McKinsey recruiting experience/Real cases
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