What this tool does
It runs a simple estimate and suggests -Xms / -Xmx numbers. Paper-style servers and heavy modpacks are treated differently on purpose.
Server & Files
Minecraft Server RAM Calculator
Rough heap estimate for dedicated servers from player count, plugin or mod load, view distance, and server software. Always validate with live performance tools - not a guarantee.
Server profile
Estimate
Estimated heap: about 4 GB Suggested flags: -Xms4G -Xmx4G Players: 20 Plugins/mods: 15 View distance: 10 Worlds: 1 Software: paper Paper/Purpur with a reasonable view distance is usually more efficient than vanilla. Host machine should have at least ~6 GB total RAM so OS and JVM metaspace are not starved. This is a planning estimate only. Monitor Spark/timings after launch. Prefer equal Xms/Xmx on many hosts to reduce heap resize pauses.
Server & Files
Minecraft Server RAM Calculator
Rough guess for how much heap you might need from player count, plugins or mods, view distance, and software type. Good for picking a VPS size. Not a lab measurement.
Take it with a grain of salt
One bad plugin or a huge world can blow past any formula. After you start the server, look at real usage. Spark helps.
Leave room on the machine
If the box has 8 GB, do not set Xmx to 8. The OS and the JVM need some too, or you will swap and everything feels awful.
Quick questions
Is more RAM always better?
Not really. Too much heap can make GC pauses worse. Match the load.
Why same Xms and Xmx?
Common habit so the heap does not grow and shrink all day. Not a law of physics, just a common default.
Is this total machine RAM?
No, mostly the Java heap. Buy a bit more RAM than Xmx.
Related tools
What do you think about this tool?
If something feels wrong, a Minecraft version is missing, the wording is confusing, or you have a better workflow idea, send it over. Real player feedback is how these tools get sharper.
Server & Files
Minecraft Server RAM Calculator
Rough guess for how much heap you might need from player count, plugins or mods, view distance, and software type. Good for picking a VPS size. Not a lab measurement.
What this tool does
It runs a simple estimate and suggests -Xms / -Xmx numbers. Paper-style servers and heavy modpacks are treated differently on purpose.
Take it with a grain of salt
One bad plugin or a huge world can blow past any formula. After you start the server, look at real usage. Spark helps.
Leave room on the machine
If the box has 8 GB, do not set Xmx to 8. The OS and the JVM need some too, or you will swap and everything feels awful.
Quick questions
Is more RAM always better?
Not really. Too much heap can make GC pauses worse. Match the load.
Why same Xms and Xmx?
Common habit so the heap does not grow and shrink all day. Not a law of physics, just a common default.
Is this total machine RAM?
No, mostly the Java heap. Buy a bit more RAM than Xmx.
Related tools
What do you think about this tool?
If something feels wrong, a Minecraft version is missing, the wording is confusing, or you have a better workflow idea, send it over. Real player feedback is how these tools get sharper.