Minecraft Stack Calculator

Which items stack to 64, 16 or 1

The stack size sets how many units fit in one slot. Most items stack to 64. Snowballs, eggs, signs, ender pearls and empty buckets stack to 16, and so do honey bottles, banners and written books. Anything with durability (weapons, armor and tools), filled buckets, potions, beds, boats, minecarts and shulker boxes do not stack (stack of 1).

A few items differ by edition: the armor stand stacks to 16 in Java and 64 in Bedrock, and the cake does not stack in Java but stacks to 64 in Bedrock. That is why the calculator has a Java and Bedrock switch. Through a component or a command, the game allows stacks up to 99 in Java and 127 in Bedrock.

• Stack of 64: blocks, ores, ingots, gems, redstone, most food, arrows and firework rockets.
• Stack of 16: snowballs, eggs, signs, ender pearls, empty buckets, honey bottles, banners.
• Stack of 1: tools, armor, potions, water, lava and milk buckets, beds, shulker boxes.
• Shulker box, single chest, ender chest and barrel: 27 slots; double chest: 54; hopper: 5.

How much fits in chests, shulkers and your inventory

A container's capacity is its slot count times the stack size. For stack-64 items, a single chest, a barrel, an ender chest and a shulker box each hold 1,728 items; a double chest holds 3,456; the player inventory (27 storage slots plus 9 hotbar slots, not counting armor and off-hand) holds 2,304; a hopper holds 320. With stack-16 items the math is the same but 4 times smaller.

A partial stack takes a whole slot, so 1,000 stack-64 items make 15 full stacks and 40 loose items, taking 16 slots. A double chest full of shulker boxes holds 54 x 1,728 = 93,312 stack-64 items. Shulker boxes cannot be stored inside other shulker boxes.

Ore blocks and when they pay off

Storing in blocks saves a lot of slots. Nine iron, gold, copper or netherite ingots, or nine diamonds, emeralds, redstone dust, lapis lazuli, coal or wheat make 1 block (or 1 hay bale), and crafting reverses the swap with no loss. A thousand iron ingots take 16 slots; turned into 111 blocks plus 1 ingot, they take 3.

Not every compacting recipe is reversible. Quartz, amethyst, glowstone, clay, snow and honeycomb use 4 items per block, and melon and nether wart blocks use 9, but none of those blocks turns back into the original item in crafting. Compact those only when you will use the block.

How long it takes to fill a chest

A hopper moves 1 item every 8 game ticks. The game runs 20 ticks per second, so that is 2.5 items per second, or 9,000 per hour, without lag. Filling a single chest with stack-64 items (1,728 items) takes 691.2 seconds: about 11 minutes and 32 seconds. A chest of snowballs (27 x 16 = 432 items) fills in about 2 minutes and 53 seconds.

If your farm produces more than 2.5 items per second on one line, the hopper becomes the bottleneck. Use the Hopper tab to compare the farm's output, in items per hour, with the time the chest needs to fill.

• Wheat or sugar cane farm: convert the hourly harvest into stacks to size your chests.
• Villager trading: see how many slots 3 stacks of emeralds take and whether a block pays off.
• Base move: add the load in the Materials list and bring the right number of shulker boxes.