How much RAM does a Minecraft server need?

A small vanilla server starts around 2GB. Add roughly 0.1GB per player, plus extra for your server type: Paper/Spigot +0.5GB, light mods +1.5GB, and heavy modpacks +4.5GB. Use the calculator to get an exact number.

How much RAM do I need for 20 players with mods?

For 20 players on a heavy modpack: 2GB base + (20 × 0.1GB) + 4.5GB = 8.5GB, rounded up to 9GB of RAM.

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