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RAM Calculator

Estimate how much memory to allocate to your Minecraft server.

Server Software

Concurrent Players

150100150200+

Optional

Recommended Allocation

4 GB

Estimated baseline 2.61 GB · rounded up with 25% headroom for GC and spikes.

Base (Paper) 1.27 GB
Players (20) 0.98 GB
Plugins (15) 0.37 GB
Headroom 0.65 GB

Java startup flags

-Xmx4G -Xms4G

Notes

  • ·These are estimates. Real RAM use varies with view distance, simulation distance, redstone, mob farms, and individual plugin/mod efficiency.
  • ·Don't allocate more than ~70% of your host's total RAM — the OS, JVM overhead, and disk cache need room too.
  • ·Allocations above 12 GB benefit from Aikar's flags with G1GC tuning.
  • ·More RAM is not always better — oversized heaps cause longer GC pauses on small servers.