Which are the most popular Fibonacci Retracement levels? The most popular (or commonly watched) Fibonacci Retracements are 61.8% and 38.2%. Sometimes these percentages are rounded to 62% and 38%, respectively. The other two 'common' retracements include 23.6% and 50% (though 50% is not part of the Fibonacci sequence).

The important levels are 61.8% (a_n-1 / a_n), 38.2% (a_n-2 / a_n), and 23.6% (a_n-3 / a_n). There are other important levels like 78.6% and 50%, which are not Fibonacci ratios but are nonetheless important. The 78.6% level is given by the square root of 61.8%, while the 50% level is a common convention.