RAM Calculator
Estimate how much RAM a Minecraft server needs based on player count, server software, plugins or mods and view distance.
Server
The busiest moment, not total members.
World
view-distance in server.properties. Default is 10.
Worlds besides the usual overworld, Nether and End, such as a resource world or lobby.
Breakdown
Estimated need: 5.5 GB
- Base server1.5 GB
1.5 GB for the server itself and the spawn area.
- Players800 MB
20 players × 40 MB for each connection, inventory and the entities around them.
- Plugins375 MB
25 plugins × 15 MB on average. A few big ones (maps, economy, world editing) can use much more.
- Worlds & view distance1.8 GB
View distance 10 keeps 441 chunks loaded per player, about 66 MB each if they spread out (1.3 GB total). 512 MB for generating new chunks, which is the most memory-hungry thing a server does.
- Headroom1.1 GB
25% on top so the garbage collector has free space to work in. A heap that runs nearly full spends its time collecting and lags.
How the estimate works
The calculator adds up a base cost for the server software, a cost per player, an average cost per plugin or mod, the chunks each player keeps loaded at your view distance, and any extra worlds. It then adds headroom so Java’s garbage collector never works with a nearly full heap. Every number is shown in the breakdown.
It assumes players spread out, so it leans high. Real usage depends heavily on what is installed: one map or world-editing plugin can outweigh twenty small ones. Watch real usage with /spark health or your panel after a busy evening and adjust.
Machine RAM vs. server RAM
The result is the heap you give Java with -Xmx. The machine needs 1 to 2 GB more for the operating system and Java’s own overhead. More RAM than you need doesn’t make a server faster, and very large heaps can make garbage collection pauses longer.
ZCraft Studios
Want us to set up your server?
Our team installs and configures plugins, sets up game modes, fixes errors and tunes performance. You talk to us directly on Discord.