1. Minecraft Inventory Slot Numbers
2. Module:Inventory Slot/Aliases – Official Minecraft Wiki

Anyone know the ID of the Helmet slot in the normal Inventory? Assult, Oct 27, 2013 #1. Also try printing out the slot. ForgeUser95269065, Oct 27, 2013 #10.

1. Expand your own inventory with different upgrades! Not to be a c, but trophy slots is a hell of a mess, lots of bugs(u kill a sheep and u get almost all inv slots, slots reset on death with the conf turned off, etc.).
2. This page was last edited on 2 December 2020, at 18:52. Content is available under CC BY-NC-SA 3.0 unless otherwise noted. Game content and materials are trademarks and copyrights of their respective publisher and its licensors.

Minecraft displays the player inventory differently, according to how the window was opened. Ranges of slot indices vary in meaning between different “windows”. The Open Window packet indicates which window is being opened according to:

• 2Chest
• 4Furnace

The slot number is calculated starting at 0, counting up through the window's unique slots, and then counting through the players inventory.

For all windows, the slot in the upper-left corner of the player's inventory is slot n where n is the number of unique slots, and slot number -999 is always used for clicking outside the window.

The default inventory window, which is never explicitly opened by the server, has 10 unique slots.

Rectangular regions are always indexed starting with the upper-left corner and scanning across rows. If a window has a crafting region, the output slot is always slot 0 followed immediately by the input region.

Each window type is described in the following sections. All slot index ranges are inclusive and reflect the indices observed in the Minecraft protocol.

For the window properties (additional data in each window, e.g. smelting progress or enchantments), refer to the table in the Window Property packet.

Using -1 as slot index and as window id will set the cursor item (the stack dragged with the mouse).

Player Inventory

This is the inventory window that the player can always open, typically by pressing E since Beta 1.4. Before, you had to press I.

Note that this is different from inventory items stored in a player.dat file. This may help: https://gist.github.com/459a1691c3dd751db160

Chest

This is the window that is opened when the player right-clicks on a single chest block.

Large chest

This is the window that is opened when the player right-clicks on a double chest block (two adjacent chest blocks).

It is possible to receive different 'Number Of Slots' parameters than those two. In vanilla, using /setblock four times around a chest and then opening the middle chest will open a window with 5*27 chest slots. Some custom servers will send chest inventories with other sizes, usually ranging from 1 row to 6 rows. These may be used for custom GUIs. It is thus important to correctly use the 'Number Of Slots' parameter in the open window packet to determine the number of rows in the chest, rather than hardcoding what constitutes a regular chest or a large chest.

Crafting table

This is the window that is opened when the player right-clicks on a workbench.

If the 'Number Of Slots' parameter is not set to 0, the opened window will behave like a container window.

Furnace

The window that appears when a furnace is right-clicked.

If the 'Number Of Slots' parameter is inferior to 3, placing an item in a slot may crash the client.

Blast Furnace

The GUI that appears when a blast furnace is opened. Same layout as a furnace; however, the recipe book displays blast furnace recipes instead of regular furnace recipes.

Smoker

The GUI that appears when a smoker is opened. Same layout as a furnace; however, the recipe book displays blast furnace recipes instead of regular furnace recipes.

Dispenser

The inventory that appears when a dispenser or dropper is opened.

If the 'Number Of Slots' parameter is inferior to 9, placing an item in a slot may crash the client.

Enchantment Table

The inventory of an enchantment table. The enchant buttons trigger a Enchant item packet.

Brewing stand

The GUI that appears when a brewing stand is opened.

Villager trading

The GUI that appears when a villager is right-clicked. Note that if the villager only requires one item, you can put it in either (or both) slots.

Beacon

The window that appears when a beacon is right-clicked.

Anvil

Hopper

The window that appears when a hopper or hopper minecart is opened.

Shulker box

This is the window that is opened when the player right-clicks on a shulker box chest.

Llama

The inventory that appears when a tamed llama is right-clicked and has a chest, or when the player's inventory is opened while riding a tamed llama. Depending on the value of the strength field, the number of chest rows may vary (max is 5, so 15 slots).

There still is a saddle slot, even though it cannot be used and is invisible.

Slot positions within the llama inventory vary - slot 2 may be at (1,0) or at (0,1) depending on the number of columns.

• Unchested llama

• Llama with strength 1

• Llama with strength 2

• Llama with strength 3

• Llama with strength 4

• Llama with strength 5

Horse

The window for when a tamed horse is right-clicked or the player's inventory is opened while riding a horse.

• Horse slots

• Skeleton horse slots

• Zombie horse slots

Donkey

The inventory that appears when a tamed donkey (or mule?) is right-clicked, or when the player's inventory is opened while riding a tamed donkey or mule.

There still is an armor slot, even though it cannot be used and is invisible.

• Unchested donkey

• Chested donkey

• Unchested mule

• Chested mule

Cartography Table

The GUI that appears when a cartography table is opened.

Grindstone

Lectern

This is a regular container, unlike with held books opened via Protocol#Open Book.

Loom

Minecraft Inventory Slot Numbers

Stonecutter

Module:Inventory Slot/Aliases – Official Minecraft Wiki