Is more RAM always better for a Minecraft server?

No. Past what the server needs there is no gain, and lag with free memory left is a processor problem, not a memory problem.

Minecraft Server RAM Calculator: How Much Memory Do You Need?

Q: How much RAM does a Minecraft server need?

The Minecraft Wiki gives 1 GB for 1 to 4 players, 2 GB for 5 to 10 players and 4 GB for more than 10, for plain servers. Mods, plugins, a big view distance and an established world with farms all raise that, so check the RAM graph of your own server with players online.

Server typePlain servers use the least. Mod loaders need more, and a modpack asks for its own amount.

Players online at the same timeThe busiest moment, not the total who join.

PluginsOnly for Paper, Purpur and Spigot servers.

WorldBig farms, redstone machines and a lot of explored land make a server work harder.

View distanceChunks players can see. The default is 10.

Where the numbers come from

Source	What it says
Minecraft Wiki, Server requirements	1 GB for 1 to 4 players, 2 GB for 5 to 10, 4 GB for more than 10. Established worlds with big machines can easily more than double that.
Minecraft Wiki, Setting up a Java Edition server	At least 2 GB for small servers, and possibly 4 GB for larger ones. Scale up with your settings.
PaperMC, Aikar's flags	Notes diminishing returns at higher amounts and advises leaving 1000 to 1500 MB below the machine's limit.

The extra amounts for mods and plugins are our own rules of thumb, not published figures. They are a starting point. Your own server's RAM graph with players online is the number that counts, and our guide shows how to read it: How much RAM does a Minecraft server need.

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Questions

Is more RAM always better?

No. Past what the server needs there is no gain. Lag with memory to spare is a processor problem. See how to reduce lag.

Why does Java show high memory use?

Java uses the memory it is given. High use is normal unless you see out-of-memory crashes or long freezes.

What about Bedrock?

This calculator is for Java Edition. Bedrock servers have their own needs: see how to run a Bedrock server.