How Much RAM Does a Minecraft Server Need?

RAM recommendations for Minecraft servers by player count, mods and settings. Detailed table with explanations.

Why RAM Matters

Minecraft stores loaded chunks, entity data, player inventories, and world generation data in RAM. When a server runs out of memory, the garbage collector struggles to free space, causing lag spikes, TPS drops, and eventually crashes with OutOfMemoryError.

Allocating the right amount of RAM is one of the most impactful decisions for server performance. Too little causes lag. Too much can also cause problems by increasing garbage collection pause times.

RAM by Player Count

Vanilla and Light Plugin Setups

Players	Recommended RAM	Notes
1-5	2 GB	Small private server
6-10	3 GB	Standard survival
11-20	4 GB	Growing community
21-40	6 GB	Established server
41-60	8 GB	Large community
61-100	12 GB	Very large server
100+	16+ GB	Consider Folia for threading

Moderate Plugin Setups (10-30 plugins)

Players	Recommended RAM	Notes
1-10	3 GB	Basic plugins
11-20	4-6 GB	Economy, permissions, protection
21-40	6-8 GB	Minigames, world management
41-60	8-12 GB	Complex plugin ecosystem
61-100	12-16 GB	Large network or many worlds
100+	16-24 GB	Consider Folia

RAM by Server Type

Setup Type	Typical RAM Range	Example
Vanilla	2-4 GB	Pure survival, no modifications
Paper (plugins)	4-8 GB	Survival + Economy + Permissions
Paper (heavy plugins)	8-16 GB	Minigame network, many worlds
Forge (light mods)	4-6 GB	10-20 mods
Forge (medium mods)	6-10 GB	30-60 mods
Forge (heavy modpack)	10-16 GB	100+ mods (FTB, CurseForge packs)
Fabric (light mods)	3-6 GB	Performance mods + few additions
Fabric (medium mods)	6-10 GB	30-50 mods
Folia	8-16+ GB	100+ players, multi-threaded

Factors That Increase RAM Usage

View Distance

View distance controls how many chunks are loaded around each player. Since Minecraft 1.18, view distance has been split into two separate settings:

View Distance — How far players can see. Affects only rendering.
Simulation Distance — How far entities and redstone are ticked. Affects server load.

# server.properties
view-distance=10
simulation-distance=6

Higher view distance dramatically increases RAM usage because each chunk radius loads exponentially more chunks:

View Distance	Chunks Loaded (per player)
4	289
6	625
8	1,089
10	1,681
12	2,401
16	4,225

Simulation distance should generally be kept lower (4-8) since it is the primary source of CPU and memory load.

Entity Count

Entities (mobs, items, minecarts, etc.) consume significant RAM. Each entity holds position data, velocity, health, AI state, and more. Mob farms and dense animal pens are common RAM consumers.

Entity-limiting plugins (e.g., ClearLagg, FarmLimiter) can help control this. See Optimizing Minecraft Server Performance for detailed strategies.

World Count and Size

Each loaded world (overworld, nether, end, custom worlds) allocates its own chunk cache. Running multiple worlds with Multiverse doubles or triples the memory footprint.

Mods and Plugins

Every loaded plugin or mod allocates memory for its data structures, cached information, and runtime state. Heavy plugins with large caches (dynmap, BlueMap, large economy databases) can add 1-2 GB each.

JVM Memory Settings

On Minecraft Server Hosting, you can configure JVM flags in the startup command. The -Xms and -Xmx flags control minimum and maximum heap size:

# Example: Allocate 6 GB with Aikar's flags
java -Xms6G -Xmx6G -XX:+UseG1GC -XX:+ParallelRefProcEnabled \
  -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions \
  -XX:+DisableExplicitGC -XX:+AlwaysPreTouch \
  -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 \
  -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 \
  -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 \
  -XX:InitiatingHeapOccupancyPercent=15 \
  -XX:G1MixedGCLiveThresholdPercent=90 \
  -XX:G1RSetUpdatingPauseTimePercent=5 \
  -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem \
  -XX:MaxTenuringThreshold=1 -jar paper.jar nogui

Set -Xms and -Xmx to the same value. This prevents the JVM from constantly resizing the heap, which causes lag spikes during expansion. Paper servers on RespawnHost come with optimized flags pre-configured.

How to Tell If You Need More RAM

Watch for these signs:

TPS drops below 18 during peak activity
Console shows OutOfMemoryError
Garbage collection spikes visible in Spark profiler (frequent Old Gen collections)
Chunk loading delays when players teleport or explore new areas

You can use the Spark plugin to profile memory usage in real time. See Optimizing Minecraft Server Performance for profiling instructions.

FAQ

Is more RAM always better?

No. Allocating too much RAM (e.g., 16 GB for a 5-player Vanilla server) increases garbage collection pause times. The JVM has to scan a much larger heap, causing periodic lag spikes. Match your allocation to your actual needs.

Does SSD speed affect RAM requirements?

Not directly, but faster storage reduces the impact of lower RAM. When the server cannot keep all chunks in memory, it falls back to disk I/O. NVMe storage (available on Minecraft Server Hosting) makes this fallback much faster.

Should I allocate all my server’s RAM to Minecraft?

No. Leave 1-2 GB for the operating system and other processes. If your server has 8 GB total, allocate a maximum of 6-7 GB to the Minecraft JVM.

What is Aikar’s flags?

Aikar’s flags are a set of JVM garbage collection tuning parameters optimized for Minecraft servers. They reduce GC pause times significantly compared to default JVM settings. Paper includes these flags by default. See Optimizing Minecraft Server Performance for details.

How much RAM does GeyserMC need?

GeyserMC typically adds 256-512 MB of overhead. If you are running Geyser for Bedrock cross-play, factor in an extra 512 MB to your RAM estimate. See Cross-Play: Bedrock Players on Java Servers for setup details.

Why does my modded server use so much RAM?

Mods load additional assets, block types, item types, entities, and data structures into memory. A modpack with 150+ mods can easily consume 10-12 GB. This is normal and expected for heavy modding.

How do I check my server’s current RAM usage?

Use the Spark plugin to generate a memory report, or check the RespawnHost panel dashboard which displays real-time memory usage graphs for your server.

Can I upgrade RAM later without data loss?

Yes. Changing your RAM allocation on Minecraft Server Hosting takes effect after a server restart. Your world and all data are preserved. With pay-per-second billing, you only pay for what you use.