Free kicks are probably the hardest plays to score unless you have Messi or some other famous guy. The percentage/chance of scoring is quite unclear to me. It seems to change every single second. What is the chance of scoring a free kick?
This differs widely, based on a large number of factors. Unlike a penalty kick, which is always taken from the same location, with no wall and only the goalkeeper to beat, free kicks can be influenced by defenders in the wall, defenders on the post, attackers making deceiving runs, position of the ball, and wind direction and speed just to list a few factors.
In the 2012 English Premier League season, OptaPro found that the average conversion rate was 5.7%.