how much studs does jjs map have

The best available estimate is about 488 studs across one side of JJS’s map, based on a community calculation that converts roughly 213.5 meters into Roblox studs.

Why that number

That estimate comes from a Reddit post doing the math from in-game scale, and it explicitly says the map size is about 213.5 meters, which it then converts to roughly 488 studs.

Small caveat

It’s an estimate, not an official developer measurement, and it doesn’t include the subway area mentioned in the post.

TL;DR: JJS map is roughly 488 studs wide on one side.