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 world size sets the baseline. A 10K Random Gen world holds far more terrain and points of interest than a 6K one, before anyone joins.
Horde night is where the rest goes: every player draws their own horde, so more players and bigger hordes mean more zombies to simulate at once. Overhaul mods like Darkness Falls add hundreds of blocks, items and enemies.
The calculator adds those up from data we collected on 7 Days to Die 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 7 Days to Die server memory.
6 GB is enough for a 6K world with a small group. 8K and 10K worlds want 10 GB, and overhaul mods or big groups on large worlds need 14 GB.
6K suits most groups. 8K gives bigger groups room to spread out, and 10K is for large servers or overhaul mods.
Yes. Overhauls such as Darkness Falls add a lot of content the server has to load.
It is an estimate based on data we collected, with headroom added. You can upgrade from the client area at any time.