You need 9 slimeballs to make 1 slime block in Minecraft.

Quick Scoop

A slime block is crafted by filling a 3x3 crafting grid with slimeballs, so the total is nine.

Handy math

  • 1 slime block = 9 slimeballs.
  • 2 slime blocks = 18 slimeballs.
  • 10 slime blocks = 90 slimeballs.

How it works

Slimeballs are usually collected from slimes, and the block is just the compact crafted form of those nine items.

TL;DR: 9 slimeballs make 1 slime block.