How to Use Your Inventory

Your inventory is where you tell AnvilCalc what books and items you actually own, so the calculator can plan around them instead of always assuming you're starting from scratch. Everything here is stored only in your own browser — see our Privacy Policy for exactly what that means.

Multiple, named inventories

You can keep as many separate inventories as you like — one per world, per character, or per server, for instance. Each has its own name, icon, and color, plus its own edition (Java or Bedrock, Bedrock first and default) and version, including a "Latest" setting that always tracks the newest version AnvilCalc supports for that edition. Whichever inventory is active is the one the calculator draws from; switch it from the same selector on either page.

How the calculator uses it

The calculator's Inventory usage control has three options. Don't use ignores the inventory and assumes every book or item is obtainable. May use picks items from the inventory when they make the plan cheaper and assumes the rest is obtainable. Only use considers just the items in the inventory: it can combine lower levels into higher ones (two Sharpness IV books into a Sharpness V) but never assumes a book from outside. The control picks for you: Don't use until the active inventory has something relevant to the item you selected, then May use. Tapping an option yourself overrides that and is remembered; Only use is always your own choice, never automatic.

The /inventory page

Open it from the header or footer nav. It shows only the active inventory — use the switcher at the top to change which one that is, which also makes it active everywhere else (including the calculator). Below that:

• Edition & version are always visible here, no need to expand anything.
• A search box filters items by name, enchantment, or level (matches both "III" and "3").
• Items and books are grouped separately, shown as square cards you tap to edit.
• + Add item opens the full editor: book or item, its type/material if it's an item, its enchantments (tap to cycle levels, same as the calculator), an optional custom name, where you got it, and whether it's already been through an anvil before. A book can hold several enchantments, which is how you enter a fished book; see Enchanted Books From Fishing.

Quantity and unlimited supply

Every item can declare how many you have (default 1) — a stack of three identical books no longer needs three separate entries. If you can always get more on demand (a standing villager trade, for instance), mark it "Available on demand" instead of tracking a number; the calculator treats it as an effectively unlimited supply rather than a fixed count.

Bringing an item back to the calculator ("Upgrade")

Tap the ↑ button on any real item (not a book) to jump straight to the calculator with that exact item — its enchantments, prior-work count, and name — already filled in as the starting point. From there you just pick what you want to add.

Moving an inventory elsewhere

Two separate mechanisms exist for that, covered in their own guides: Importing and Exporting Inventories (a .json file, best for backups or moving between your own devices) and Sharing Your Inventory (a link, best for sending a copy to someone else).

Manage your inventory →

Frequently asked questions

What does "unlimited supply" mean for a villager trade entry?

It tells the calculator it can treat that source as an effectively unlimited supply rather than a fixed count — useful for a standing villager trade you can always repeat, instead of tracking some arbitrary number of copies.

What is the "Upgrade" round trip?

Tapping the ↑ button on a real item (not a book) jumps to the calculator with that exact item — its enchantments, prior-work count, and name — already filled in as the starting point. You then pick what to add on top, and can head back to /inventory afterward.

How is unlimited supply different from just setting a high quantity?

Quantity tracks a specific number of identical copies you actually have — a stack of three books is one entry with quantity 3. "Available on demand" skips tracking a number at all; it's for a source you can always get another of, not a large-but-finite stack.

Can I keep separate inventories for different worlds or characters?

Yes — you can keep as many named inventories as you like, each with its own icon, color, edition, and version. Whichever one is active is the one the calculator draws from.