Minecraft Server RAM Calculator

That depends on the server variant or Modpack. For a Paper server with 10 players, the calculator estimated 4.6 GB on 12 Oct 2026. Vanilla comes in lower in the estimation formula, while a Modpack comes in significantly higher. Enter your own combination above to calculate your result.

Search for your Modpack and optionally select a version. Without measured data, the estimate uses Vanilla as a baseline (multiplier 1.0), plugin servers such as Paper at 1.15, Mod loaders such as Forge, Fabric or NeoForge at 1.4, and Modpacks at 2.0, because each Mod loads additional blocks, entities and world logic into memory. The multiplier rises to 2.5 for Modpacks with 200 or more Mods and 3.0 for 400 or more. If the Modpack authors specify a higher RAM requirement, that takes precedence. When measured data is available, the estimate uses the measured usage.

If at least 20 ZAP servers running your Modpack or server variant have measurements in the relevant player range, the calculator uses the 95th percentile of their actual RAM usage over the last 30 days. Otherwise, it calculates a labeled estimate based on base RAM and player count, which may change as more measurements become available. The result indicates which basis applies with “Based on real measurement data” or “Estimate (no measurement data yet)”.

Yes, allocating much more RAM than necessary can lengthen Java garbage collection pauses instead of helping. That's why the recommendation is based on measured usage or the estimation formula, not the highest possible value.

Add the value as the maximum memory (-Xmx) to your server's startup command. The startup script generator creates the right Java startup command for you. For a rented server, your plan determines how much RAM is available. Go to the startup script generator

You can enter 1 to 500 concurrent players. Up to the default number of Slots, the estimate uses a fixed amount of RAM per player. Beyond that, it uses only 40% of that amount because players share many of the loaded chunks. Measurement data is grouped into player ranges: 1–2, 3–5, 6–10, 11–20 and 21+.

The calculator is free and works without an account or sign-in. Only the number of requests is limited to prevent abuse. Alongside the RAM recommendation, the result shows the smallest ZAP plan with enough RAM to meet it—in the example above, ZAP Ranger.

The statistics come from RAM measurements taken over the last 30 days on Minecraft servers run by ZAP-Hosting customers—including your server, if you host one with us. Measurements are analyzed only in aggregate and anonymously: customer, server and IP details are not included. Statistics are generated only when at least 20 different servers have the same combination of Modpack or server variant and player range.