How much RAM does a Minecraft server need? For a small Java Edition world, start with 4 GB of VPS RAM; use 6–8 GB when you add a meaningful plugin set or light modpack, and move to 8–16 GB for larger modpacks or a busy community. The right number depends on the server software, modpack, view distance, CPU, and how much memory you leave for Linux and Java outside the game heap.
Quick table: RAM by players and mods
Use this table as a starting budget for one Minecraft Java server on Linux. It assumes sensible view distances, SSD storage, and no other heavy applications. These are planning ranges, not player-slot guarantees: a five-player modpack can need more memory than a 20-player vanilla world.
| Server workload | Typical concurrent players | VPS RAM to start with | Practical note |
|---|---|---|---|
| Vanilla or lightly optimised server | 1–5 | 2–4 GB | 4 GB is the more comfortable choice if the world is permanent. |
| Vanilla or Paper with plugins | 5–15 | 4–6 GB | Plugins, entities, and new chunk generation decide whether you need the upper end. |
| Paper with a larger plugin set | 15–30 | 6–8 GB | Leave room for Java, the OS, backups, and temporary chunk activity. |
| Light or medium modpack | 3–10 | 6–10 GB | Check the modpack author’s server recommendation before buying. |
| Heavy modpack or busy community | 10–30+ | 10–16 GB | The pack, world size, automated farms, and CPU speed can matter more than slots. |
| Network or several servers | Variable | 16 GB+ | Budget RAM per running instance, plus operating-system headroom. |
The word “RAM” on a hosting plan is the machine’s total memory. It is not the same as the -Xmx value you give Java. On an 8 GB VPS, for example, Paper’s guidance says to reserve roughly 1,000–1,500 MB for Java’s non-heap memory and the operating system, so a starting heap around 6,500 MB is safer than assigning all 8 GB to Minecraft. Read Paper’s Aikar’s flags guidance before changing your startup command.
Vanilla vs Paper vs modded Minecraft
Vanilla is usually the simplest memory case because it has no plugin layer. A large explored world, high simulation distance, frequent exploration, many entities, or redstone-heavy bases can still create spikes, though a small private world does not automatically need 8 or 16 GB.
Paper is a performance-focused server implementation that supports Bukkit-style plugins. It can be a sensible choice when you need moderation, permissions, claims, or other server features, but each plugin adds code and data to load. A plugin that keeps maps, databases, or large numbers of entities active may affect memory and tick time much more than several simple command plugins.
Modded Minecraft needs a different estimate. The loader, mods, generated chunks, automation, and sometimes a separate database all add overhead. Use the modpack’s server instructions first, then add headroom for expected players. “Number of mods” is only a rough signal: a few large content mods can require more memory than dozens of small utility mods.
Java Edition requires a compatible Java runtime. Bedrock uses different server software, so size it separately.
Why too much RAM can hurt
More memory helps when the server is actually short of memory. It does not automatically increase tick speed, fix a slow plugin, or compensate for a CPU that cannot finish its work within the 50-millisecond target for a 20 TPS server.
Giving Java an unnecessarily large heap can also make garbage collection less efficient. The server may spend more time managing a large heap, while Linux has less space for file caches and other processes. That is why a correctly sized 4 GB or 8 GB machine can feel better than an oversized plan with careless JVM settings.
Use a simple sizing loop:
- Choose a plan with enough headroom for the OS and Java outside the heap.
- Start with the modpack author’s recommendation, or the table above for vanilla and Paper.
- Test with your real world, view distance, simulation distance, farms, and expected peak players.
- Watch memory use and tick performance during exploration, not only while everyone is standing at spawn.
- Increase RAM only when measurement shows memory pressure; investigate plugins, entities, chunk generation, and CPU time when memory is not the bottleneck.
CPU and disk matter more than you think
RAM is only one part of a Minecraft server. Chunk generation and simulation create CPU work, while world saves and new chunk reads depend on storage latency. A server can have free memory and still lag during exploration if a core is busy or a plugin is blocking the main thread.
The two settings most readers should understand are view-distance and simulation-distance. Paper’s server.properties reference defines the first as world data sent to each client and the second as the radius in which entities are updated. Raising either increases work around each player, so lowering them moderately can be a better first test than immediately buying more RAM.
Storage also affects the first visit to new terrain and the time needed to save a world. Keep the world on SSD storage, avoid unrelated disk-heavy services, and keep regular backups somewhere separate. A backup protects the world but is not a substitute for enough live disk space.
Using Aikar’s flags without wasting memory
Aikar’s flags are JVM startup options commonly used with Paper. They are not a magic performance switch and should be matched to the memory available to the machine. The official Paper page warns that Java and the operating system need memory above the Xmx value.
For an 8 GB VPS running one Paper server, a conservative starting command can look like this after you have installed the correct Java version and downloaded paper.jar:
java -Xms6500M -Xmx6500M \
-XX:+UseG1GC -XX:+ParallelRefProcEnabled \
-XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions \
-XX:+DisableExplicitGC -XX:+AlwaysPreTouch \
-jar paper.jar --noguiFollow the Paper version and current Aikar’s flags documentation. Do not copy -Xmx10G onto an 8 GB VPS or run multiple servers with the same heap allocation unless the machine has room for all of them.
Picking a VPS size for your Minecraft server
For most first self-hosted worlds, the Buffalo Linux VPS 4 GB is the sensible starting point. It has 4 GB of reserved RAM, 3 vCPUs, 60 GB of SSD storage in RAID 1, 3 TB of traffic, full root access, KVM virtualization, and a dedicated IPv4 address. It costs $9.99/mo and supports Debian 12, Ubuntu 24.04, AlmaLinux 9, and Rocky Linux 9.
Use the Buffalo Linux VPS range like this:
| VPS size | Good starting use |
|---|---|
| 2 GB, $5.99/mo | A very small test world with low expectations and no heavy plugin stack. |
| 4 GB, $9.99/mo | A small vanilla or Paper server for friends; the best general starting point. |
| 8 GB, $16.99/mo | Light-to-medium modpacks, more plugins, or several applications alongside Minecraft. |
| 16 GB, $29.99/mo | A busy server, a large modpack, or a Minecraft instance with substantial growth headroom. |
| 32 GB, $54.99/mo | Several heavier workloads or multiple server instances that you have measured carefully. |
The 4 GB plan has 200 Mbps service, while the 8 GB plan has 300 Mbps and the 16 GB plan has 500 Mbps. Bandwidth is separate from RAM and does not make a poorly sized JVM faster. All provide root access for your own server software and configuration.
Our game server provider checklist covers control, location, storage, backups, and support. For the wider trade-off between self-hosting options, see home game server vs VPS vs dedicated server. Choose the smallest first VPS that leaves measurable headroom.
How to tell when you need more RAM
Look at more than the plan’s headline memory. During a busy test, check the Java process, free system memory, swap activity, tick time, and the server log. A recurring out-of-memory error, a heap that stays close to its maximum, or repeated allocation failures are stronger evidence for more RAM than a single lag spike.
If memory remains available while TPS drops, check the main thread, plugins, entities, chunk generation, and view or simulation distance. If the server only lags when players generate new terrain, pre-generating important areas and reviewing storage and CPU performance may help more than adding memory. Change one variable at a time so you know what fixed the problem.
FAQ
Is 4 GB RAM enough for a Minecraft server?
4 GB is a practical starting point for a small vanilla or Paper server with a few friends and a moderate configuration. It is not a promise of a fixed player count: a heavy plugin stack, high distances, or a modpack can move the requirement to 6–10 GB or more.
Is 2 GB enough for a modded Minecraft server?
2 GB may be useful for a test world or a very light setup, but it leaves little room for Java and Linux overhead. Check the modpack’s server recommendation first; most meaningful modded setups are better planned around 6–10 GB and tested with the actual pack.
Does more RAM reduce Minecraft server lag?
More RAM can reduce lag caused by memory pressure, but it cannot fix every lag source. CPU saturation, slow chunk generation, excessive entities, a plugin problem, and high view or simulation distance can all cause poor tick performance while memory is still available.
How much RAM should I allocate to Minecraft on an 8 GB VPS?
Start around 6,500 MB for one Paper server and keep the rest for Java’s non-heap memory and Linux. Adjust after observing real usage, and do not allocate the entire VPS to -Xms and -Xmx.
Can I run more than one Minecraft server on one VPS?
Yes, but add the heaps together and reserve memory for the operating system and each process’s overhead. Two small servers may fit on a 16 GB VPS, while two modded servers may need much more; measure each workload instead of dividing the advertised RAM evenly.
