Method 1: Crafting Table
Place 3 Stone in a Crafting Table to make 6 Stone Slabs.
6 How to Make a Stone Slab in Minecraft
Use this simple recipe to make a Stone Slab in Minecraft. You can see the exact ingredients, recipe layout, and workstation below.
Stone Slab recipe
Follow the recipe below. The pattern must use the correct slots when the recipe is shaped.
6 
Method 2: Stonecutter
Use 1 Stone in a Stonecutter to make 2 Stone Slabs.
2 About this Minecraft recipe
This page shows the vanilla recipe for Stone Slab. It includes the exact ingredients, recipe layout, required workstation, and amount produced.
The data comes from Minecraft Java 26.2. Recipes can change in later game versions, so check the version you play before crafting.