How much memory does your server actually need? Answer three questions and find out.
Minecraft Server RAM Calculator
4 GB
recommended
bare minimum: 2 GB ·
comfortable: 6 GB
Quick reference
| Setup | 1–5 players | 10 players | 20 players | 40+ players |
|---|---|---|---|---|
| Vanilla | 2 GB | 3 GB | 4 GB | 6 GB+ |
| Paper + ~10 plugins | 2–3 GB | 4 GB | 5 GB | 8 GB+ |
| Light modded (Fabric/Forge) | 4 GB | 5 GB | 6 GB | 10 GB+ |
| Medium modpack | 6 GB | 8 GB | 10 GB | 12 GB+ |
| Heavy modpack (150+ mods) | 8 GB | 10 GB | 12 GB | 16 GB+ |
What actually eats your RAM
Loaded chunks are the biggest factor. Every player keeps a bubble of chunks loaded (your view distance setting), so RAM scales with players × view distance far more than with players alone. Dropping view distance from 10 to 7 can cut memory pressure by a third on busy servers.
Mods multiply everything. Modded servers hold far more block, item, and entity data per chunk. A heavy modpack can need four times the memory of vanilla with the same player count.
Plugins are lighter but add up — most well-written plugins cost 20–50 MB each, but world-editing, anti-cheat, and image-map plugins can spike much higher.
More RAM isn't always better. Past ~12 GB, oversized Java heaps can cause longer garbage-collection pauses (lag spikes). If you allocate 8 GB or more, use Aikar's JVM flags, which are tuned exactly for Minecraft servers.
Once your server is running, list it here for free to start attracting players, and use the status checker to confirm it's reachable from the internet. Need a config? Try the server.properties generator.
Frequently asked questions
Is 2 GB enough for a Minecraft server?
For a vanilla server with 1–5 players and default view distance, yes — 2 GB runs fine. Add plugins, mods, or more players and 2 GB becomes the first thing that causes lag. Paper with a handful of plugins is happier at 3–4 GB.
Does more RAM fix server lag?
Only if RAM is actually the bottleneck. Most Minecraft lag is single-thread CPU time (entities, redstone, chunk generation) — extra memory won't help that at all. Check your server's MSPT/TPS first: if TPS is below 20 while memory has headroom, you need a faster CPU or fewer entities, not more RAM.
How do I set how much RAM my server uses?
In your start command: java -Xms4G -Xmx4G -jar server.jar nogui allocates 4 GB.
Set -Xms and -Xmx to the same value for Minecraft servers, and leave 1–2 GB of the machine's total
memory for the operating system itself. On a hosting panel, it's usually a slider or plan limit
instead.