How much RAM does a Minecraft server need?
The honest answer is: it depends on two things — how many people play at once, and what you're running. A vanilla survival world for four friends is happy on 2 GB. A heavy modpack for the same four people can need 8 GB or more. Here's how to size it properly, without overpaying for RAM you'll never touch.
The quick answer
For a Paper or Spigot server (vanilla-style survival with plugins), a good starting point is 2 GB for up to four players, then roughly 1 GB for every extra handful of players. Modded servers are the exception — they can double or triple those numbers.
RAM by player count (Paper / plugins)
| Players | Recommended RAM | Notes |
|---|---|---|
| 1–4 | 2 GB | Small SMP, a few plugins |
| 5–10 | 3 GB | Friends' server, light plugins |
| 10–20 | 4 GB | Active community server |
| 20–40 | 6 GB | Busy public server |
| 40–75 | 8 GB | Large server, many plugins |
| 75–150 | 10–12 GB | Big network node |
These figures assume Paper or a similar optimised server jar. Plain vanilla needs a little less; heavily modded needs a lot more.
Vanilla vs plugins vs modpacks
- Vanilla / Paper: lightest. 2–4 GB covers most small-to-medium servers.
- Plugin servers (Spigot/Paper + plugins): a bit heavier — each plugin adds overhead. Add ~1 GB of headroom.
- Forge / Fabric mods: much heavier. Even a small modded server often wants 4–6 GB before any players join.
- Large modpacks (RLCraft, All the Mods, Create packs): the heavyweights. Budget 6–10 GB even for a handful of players.
This is why player count alone is a bad way to size a server. A 50-player vanilla server can run on less RAM than a 4-player modpack.
Why more RAM won't fix lag
This is the biggest misconception in server hosting. RAM stops your server crashing or stuttering when it runs out of memory — it does not make each game tick faster. Tick performance (your TPS, ideally a steady 20) is driven mainly by CPU single-thread speed, because Minecraft is largely single-threaded.
If your server is lagging with plenty of free RAM, the fix is almost never 'add more RAM'. Look at a faster CPU, a lower view/simulation distance, fewer entities, or a more optimised server jar instead.
How to allocate it properly
- Never hand all your system RAM to Java — leave ~1–2 GB for the operating system.
- Over-allocating can hurt: a huge heap makes garbage-collection pauses longer, which shows up as periodic lag spikes.
- Use Aikar's flags (a well-known set of JVM start-up flags) to tune garbage collection — they smooth out those spikes.
- Lower your view-distance and simulation-distance before buying more RAM. Dropping from 12 to 8 chunks can transform performance.
FAQ
Is 4 GB enough for a Minecraft server?
For a Paper/plugin server, 4 GB comfortably handles roughly 10–20 players. It's also fine for a small modded server, but large modpacks will want 6 GB or more.
Does more RAM increase server TPS?
No. RAM prevents out-of-memory lag and crashes, but tick rate (TPS) is driven by CPU speed. If you have spare RAM and still lag, the bottleneck is the CPU, your settings, or an unoptimised jar — not memory.
How much RAM for a modded server?
Start at 4–6 GB for a light modpack and 6–10 GB for a large one, before adding for extra players. Modded Minecraft is memory-hungry and single-thread bound, so a high CPU clock helps as much as the RAM.