Minecraft Anvil Cost Calculator

How the Minecraft Anvil Cost Calculator works

Anvils let you stack enchantments that the enchanting table never offers together, such as Mending with Unbreaking III. The catch is the prior work penalty. Every trip through an anvil makes the next one cost more, and the penalty doubles each time. Plan the order badly and a diamond sword becomes impossible to improve after a handful of uses.

How the Minecraft anvil cost calculator works

The cost of one anvil operation is the sum of four parts:

• Target penalty: 2ⁿ − 1 levels, where n is how many times the item on the left has been used on an anvil.
• Sacrifice penalty: the same formula for the item or book on the right.
• Enchantment cost: what the sacrifice adds. Each enchantment costs its level times a multiplier, lower for books than for items. Enter the total here.
• Rename: 1 extra level if you change the name in the same step.

After the operation the result counts as having been used once more than whichever input had more uses. That new count sets the penalty for its next trip.

Worked examples

Example 1: a sword with 2 anvil uses takes a book with 1 use carrying 6 levels of enchantments, and you rename it. The cost is 3 + 1 + 6 + 1 = 11 levels, and the sword moves to 3 uses.

Example 2: a pickaxe with 5 uses takes a fresh book worth 8 levels. The cost is 31 + 0 + 8 = 39, the most Survival allows. The pickaxe moves to 6 uses, and its next trip will be Too Expensive.

The prior work penalty doubles

Combined penalty and levels left for enchantments under the Survival limit of 39

At 5 uses the penalty alone is 31 levels. In Survival any operation costing 40 or more levels is refused with "Too Expensive!", so after five or six uses there is no room left for enchantments. Creative mode has no such limit, which the calculator reflects when you switch the mode.

Combine books first, then the item

The best order is to merge enchanted books with each other in pairs, like a tournament bracket, and only then apply the finished book to the item. Pairing items with equal use counts keeps the penalty low, because the result only goes up by one from the larger count. Adding books to a sword one at a time instead gives it a new use each time, and the penalty climbs with every step.

For example, take four fresh books. Merge them as two pairs, giving two books with one use each, then merge those into one book with two uses. Applying it to a fresh sword leaves the sword on three uses, with a 7-level penalty for its next trip. Adding the four books to the sword one at a time leaves it on four uses and a 15-level penalty, and each step along the way cost more too.

Where the enchantment cost comes from

Each enchantment on the sacrifice costs its level multiplied by a rarity factor. Common ones such as Sharpness and Protection cost 1 per level from a book, rarer ones such as Mending 2, and very rare ones such as Silk Touch 4. Doubling applies when the sacrifice is an item rather than a book. Add up those numbers for the enchantments that will transfer and enter the total.

Tips and pitfalls

Rename in the same step. A rename costs 1 level. Do it together with another operation so it does not add a separate anvil use.

Repairing with material also adds a use. Fixing a pickaxe with diamonds raises its penalty just like combining. Mending gear never needs an anvil repair, so give it Mending early.

Books are cheaper than items. The enchantment multiplier for a book sacrifice is half that of an item, so combine onto books where you can.

Level 39 is the Survival ceiling. Every operation must cost 39 or less, not 40.

How to read the result

Anvil cost is what the anvil will ask for. Prior-work penalty shows how much of that is pure penalty. Anvil uses after this is the item's new count and the penalty it will carry next time. The last line warns how many more trips are realistic before penalty alone rules out enchanting.

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