Everything is spot on, exactly what you want
The service, the servers, it's nothing but fantastic. Will help you with whatever it is, even if you're slow like me they help amazingly and keep their cool. Nothing but love for the guy, an amazing soul.
The map sets the baseline. Vanilla maps like PEI are light, while big Workshop maps such as California2 or Elver carry many more objects the server keeps loaded.
Workshop mods like vehicle and item packs add models and items to load, and every plugin (kits, shops, economy) adds a little on top. Players themselves are cheap in Unturned.
The calculator adds those up from data we collected on Unturned servers, then leaves about 15% headroom so the server never runs right at its limit. It's a guide, not a promise, and you can upgrade from the client area at any time.
Quick answers about Unturned server memory.
A server on a small map like PEI runs in 2 GB. Medium maps with plugins sit well in 4 GB, and large maps such as California2 with many mods want 6 to 8 GB.
Yes. Big custom maps hold far more objects than the vanilla maps, so they raise the baseline before anyone joins.
Each one adds a little. Dozens of plugins, especially economy and shop plugins, add up to a noticeable amount.
It is an estimate based on data we collected, with headroom added. You can upgrade from the client area at any time.