napkin math

English

Noun

napkin math (uncountable)

  1. (Canada, US) The act of performing quick mathematics often as a means of estimation, as if done on the back of a napkin (or in one's head).
    • 2018, Levi Lusko, I Declare War: Four Keys to Winning the Battle with Yourself‎, page 124:
      Based on my napkin math—and keep in mind I am terrible at math—if you made every conscious choice to do right, your highest potential “life grade” is a D once your bad habits are subtracted.

See also
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