How many people are playing Fortnite?

The game powering the evil PC entity aka. Epic Game Store.
The short answer: a lot
Epic revealed Fortnite touts 250 million registered accounts across all platforms.
Still, it’s Epic itself that most recently hinted at some unbelievable growth. During a presentation at the Game Developer’s Conference in March, Epic divulged Fortnite had reached a peak player concurrency of 10.8 million, a whopping 218 percent increase in activity from the prior figure of 3.4 million reported last year. That’s also a month and some change out from the supposed 10.7 million-strong Marshmello live concert hosted within Fortnite in February. That’s more people than the population of Sweden