tModLoader & Calamity Server Hosting (2026)

Modded Terraria needs real hosting — here's why

Vanilla Terraria is famously cheap to host: a group of friends runs comfortably on 1–2 GB of RAM. The moment you install tModLoader and load Calamity, that changes. Mods add thousands of items, NPCs, projectiles and world data that all live in memory, so a modded server needs three to four times the RAM of vanilla — and the wrong setup will simply crash on world load.

This guide covers exactly how much RAM each modpack needs, the 64-bit requirement that trips up most people, the crash fixes that actually work, and which real hosts run heavy modpacks without falling over. Every price and plan here is pulled from live Terraria hosting, the same data behind our Terraria server cost breakdown.

How much RAM does each modpack need?

RAM is the single biggest factor for a modded Terraria server. The figures below are real-world memory footprints for a small co-op group — public servers with more players need extra headroom on top.

The pattern is clear: tModLoader base already pushes you past vanilla, Calamity sits around 4 GB, and the moment you stack two big content mods like Calamity and Thorium you should plan for 8 GB and a Large world. Infernum is the interesting exception — it overhauls boss AI instead of adding thousands of new items, so memory use stays close to Calamity alone.

The crash gotcha: 32-bit tModLoader caps at 4 GB

This is the number-one reason modded Terraria servers crash, and almost nobody warns you about it up front.

In practice, a modded crash is almost always one of two things: you're on the 32-bit build (hard-capped at ~4 GB), or you're on 64-bit but on a plan that doesn't have enough RAM for your modpack. Fix both and the vast majority of "my modded server keeps crashing" problems disappear. Modern managed hosts default to 64-bit tModLoader, so the practical job is choosing a plan with enough allocated RAM — which is exactly where the table above pays off.

A few other quick fixes worth knowing:

• Client and server mods must match exactly — same mods, same versions, or players fail to connect.
• Use a Large world for stacked modpacks — Calamity + Thorium expect the extra space; a Small world can corrupt or fail to generate.
• Give the server a moment on first boot — heavy modpacks take longer to load all assets into memory before the world is joinable.

Which hosts run modded Terraria well?

Not every cheap Terraria plan can handle Calamity. You need a host that gives you enough RAM on 64-bit tModLoader — and, for bigger communities, the CPU and slots to match. These are the two providers we compare for Terraria, with the real plans that fit modded play.

Mapping modpack to plan makes the choice simple:

The split is straightforward: Shockbyte owns the cheap entry point for a single content mod (€8.56 for 4 GB, 12 slots), while Minestrator's MyBox tiers give you the RAM and unlimited slots on France NVMe that stacked modpacks and public servers need. For the full plan-by-plan pricing across both hosts, see the Terraria server cost guide.

How to set up a modded Terraria server

Once you've picked a plan with enough RAM, getting a tModLoader server live is quick on a managed host.

Big modded communities: run TShock

If your modded server is more than a handful of friends, add TShock. It's the standard server framework for large Terraria communities, bringing permissions, region protection, anti-grief tools and admin commands that vanilla tModLoader hosting doesn't provide. We recommend it once you pass about 5 concurrent players — and it pairs naturally with Minestrator's MyBox tiers, where unlimited slots on France NVMe mean a 30- or 64-player modded server is a question of RAM and CPU, not per-slot pricing.

Modded Terraria hosting FAQ