To craft a full set of Netherite armor in Minecraft, you need 16 Netherite scraps. Here is the detailed breakdown:

• Each Netherite ingot requires 4 Netherite scraps and 4 gold ingots.
• A full set of Netherite armor consists of 4 pieces (helmet, chestplate, leggings, boots).
• Therefore, you need 4 Netherite ingots, which means 4 × 4 = 16 Netherite scraps.
• To get Netherite scraps, you must mine Ancient Debris in the Nether and smelt it; each Ancient Debris block yields 1 Netherite scrap.
• You also need 16 gold ingots to combine with the 16 Netherite scraps to craft the 4 Netherite ingots.
• Additionally, to upgrade diamond armor to Netherite armor, you need a smithing table and Netherite Upgrade Smithing Templates (found in Bastion remnants), but these do not affect the number of Netherite scraps required.

In summary:

• 16 Netherite scraps (from 16 Ancient Debris)
• 16 gold ingots
• 4 Netherite ingots (crafted from the scraps and gold)
• 4 diamond armor pieces (to upgrade)
• Smithing table and upgrade templates (for the upgrade process)

This process is consistent across Minecraft versions 1.19 and 1.20, with the 1.20 update adding the requirement for upgrade templates