Ken Chow is discussing the importance of Fibonacci Extensions and how you can extremely benefit from these levels especially the 261 % Level and the 361 % Level extension ..

Ken also is referring to the term " Skewing " and what  does it mean in trading and it's Significance regarding the power of price movement illustrating all these concepts on real chart examples .. very beneficial video and i hope it offers something new to your trading knowledge .. ☺

Note : you don't need to calculate any thing as most platforms like Metatrader 4 will allow you to add any level you want and calculate the ( % ) for you ..