did you try looking for the requirements on the website?
taken from
https://epicgames.helpshift.com/a/fortnite/?s=pc&f=what-are-fortnite-s-minimum-and-recommended-specifications&l=en
What are Fortnite's minimum and recommended specifications?
Fortnite is designed to run well on a wide variety of PC hardware so that as many players as possible can jump in and play. In order to provide the most enjoyable experience when playing Fortnite on PC, we recommend the following system specifications.
Recommended System Specifications
Operating System Windows 7/8/10 64-bit
Processor Core i5 2.8 Ghz
Memory 8 GB RAM
Video Card Nvidia GTX 660 or AMD Radeon HD 7870 equivalent DX11 GPU
Video Memory 2 GB VRAM
Minimum System Requirements...