Minecraft Server RAM Calculator
Get a low, recommended, and high RAM range for Vanilla, Paper, Forge/NeoForge, Fabric, Bedrock, or a proxy, with every number behind it shown.
Your recommendation
Range 3-5GB
Moon, 4GB RAM
$4.00/mo
Why this number
- Base process overhead+2GB
- 10 peak players+2GB
What actually drives RAM usage
Your server software, player count, plugin or mod count, and simulation distance all add up. World size on disk barely matters. Only the chunks loaded in memory do.
Vanilla vs. plugins vs. mods
Plugins run inside Paper or Purpur and add a modest, predictable amount of memory each. Mods on Forge, NeoForge, or Fabric load more textures, models, and recipe data up front, so the same count costs more RAM. A full modpack adds that up across dozens of mods.
Why more RAM isn't always better
Java only uses what you tell it to with -Xmx. Setting it well above what the server needs doesn't speed anything up, and an oversized heap can make garbage collection pauses longer. Size for your setup, then verify it.
Verifying after launch
Run /tps under real load, or install a profiler like spark for detail. Dropping TPS or a heap near the ceiling means it's time to scale up. A Minecraft server with easy plan upgrades makes that painless.
RAM by scenario
For reference. Use the calculator above for a number tailored to your server.
| Scenario | Recommended |
|---|---|
| Vanilla, 5 players | 3GB |
| Vanilla, 10 players | 4GB |
| Paper, 20 players, 25 plugins | 6GB |
| Fabric, 5 players, 30 mods | 5GB |
| Forge/NeoForge, 5 players, ~50-mod pack | 7GB |
| Bedrock, 10 players | 2GB |
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How much RAM does a Minecraft server need?
A small vanilla server for a handful of friends usually runs fine on 2-4GB. Add plugins, mods, or more players and that climbs fast. A Paper server with 50 players and 50 plugins can want 10GB or more, and a heavy modpack can push past 16GB. There's no single right number, which is why this calculator shows a range instead of one figure.
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How much RAM does a modded Minecraft server need?
More than plugins for the same player count, generally. Mods tend to load more textures, models, and recipe data into memory than an equivalent plugin, and a large modpack compounds that across every mod installed. Enter your mod count (or pick Forge/NeoForge/Fabric above) and the calculator adds that overhead on top of the base and per-player cost.
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Is more RAM always better for a Minecraft server?
No. Past a certain point, extra RAM mostly sits idle, and a very large heap can actually make Java's garbage collector pause for longer when it does run, which shows up as lag spikes. Size for what your setup actually uses, leave the headroom this tool suggests, and watch performance after launch instead of assuming bigger is always smoother.
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What's the difference between plan RAM and JVM heap (-Xmx)?
Plan RAM is the total memory your server has available. The JVM heap (-Xmx) is how much of that you tell Java it's allowed to use for the game itself. Setting -Xmx equal to your full plan RAM leaves nothing for the JVM's own overhead or the panel process, which is why this calculator suggests a heap a bit below the matched plan's total.
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How do I check if I sized my server correctly after launch?
Run /tps in-game to see your ticks per second. 20 is healthy, and anything consistently lower means the server's struggling. For a closer look at memory, install a profiler like spark and watch heap usage under real load. If you're consistently near the ceiling or TPS is dropping, it's time to scale up.
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Does view distance or simulation distance affect RAM?
Yes. Higher view distance means more chunks stay loaded in memory at once, and higher simulation distance means more of those chunks are actively ticking (mobs, redstone, crops). Both are in the advanced section above and factor into the estimate, separate from player count.