Interactive Tools
Calculators and simulators built from actual Minecraft game code. Java 26.2, no login required.
Self-hosting · Rented servers
Server RAM Calculator
How much memory your server needs, by player count, mods, and view distance. Includes the JVM flag and hosting plans that fit the result.
Mob farms · Iron farms · Crops
Farm Troubleshooter
Your farm is built and producing nothing. Answer a few questions about what you are seeing and get the actual cause, ordered by how often each one is to blame.
Enchanting · XP farms
XP Level Calculator
How much experience a level costs and how long that is in farm time. Covers the piecewise level curve and per-farm rates you can override with your own.
Natural farms · Spawner rooms
Mob Spawner Optimizer
Simulate AFK distance spheres (24 to 128m), evaluate spawning platforms, check spawner room dimensions and mob caps in real-time.
Clocks · Flying machines · Extenders
Clock & Piston Calculator
Build repeater clocks by period in ticks, ms, or seconds. Calculate flying machine speed and piston extender timing.
Overworld to Nether · Portal linking
Nether Portal Calculator
Convert coordinates between Overworld and Nether using the 8:1 scale ratio. Get exact portal locations and a build checklist.
Casual · Discovery · New
Minecraft Alchemy
Combine two things to discover a third. Start with water, lava, dirt and air and find every block, item, mob and dimension. See what other players are discovering live.
Daily puzzle · New
Mobdle
A daily Minecraft Wordle. Guess the mob of the day from its behavior, type, dimension, health and the version it was added. Hints, practice mode and a share card.
- ▸Spawning spheres computed from actual Minecraft voxel distance checks (no approximation)
- ▸Repeater clock decomposition uses integer-exact tick arithmetic
- ▸Nether coordinate ratio is precisely 8:1 on X and Z; Y is independent
- ▸All calculations version-pinned to Java 26.2 game rules