Even though the "ranking" section of the game already allows you to get information about your performance, there is a website that can offer you a wealth of information in Fortnite Battle Royale.
This site is Fortnite Tracker.
- Go to the site
- Enter your name
- The result of all your hours spent on the game will be summarized.
Of course, you'll find your number of victories and your K/D ratio, but you'll also find much more detailed information, such as your in-game average survival time, or the detailed history of all your last games.
More importantly, you'll know where you stand in relation to the rest of the world, as each of your statistics is compared to the results of the community as a whole.