Terraria Reforge Cost Calculator

Work out what a Terraria reforge grind really costs. Every quote the Goblin Tinkerer gives moves with the modifier already on the item, so one price tells you nothing: this prices the whole run to Legendary, Unreal, Mythical or Menacing, in coins.

Reforge economics Desktop 1.4.5

What the whole grind costs, not what one roll costs

Item

Picking one fills the four fields below. Choose Something else to type your own.

Sell value

The Sell figure on the item's wiki page. The Tinkerer charges against five times it.

Coin

Which coin that figure is in.

Item type

Sets which prefixes the item can roll, and how much each one moves its price.

Prefixes it can roll

Filled in from the item type. Some items roll fewer — a Minishark rolls 19, not 35, because it has no knockback. Changing this changes the odds, not the prices.

Prefixes you'd accept

How many of them you would keep and stop. The biggest lever on this page.

Full price Discount Card

Goblin Tinkerer's price

The percentage the game prints beside his shop. 75% is the happiest he gets, 150% the angriest.

Expected total spend

14 platinum 38 gold 39 silver 73 copper

40.0 reforges at 35 gold 95 silver each on average

Reforges on average

40.0

1 of the 40 prefixes it can roll

Price per reforge

33 gold 33 silver 33 copper

quoted from 10 gold 45 silver to 1 platinum 3 gold, depending on what it is wearing

Coin-flip point

28

10 platinum 6 gold spent by then

The price is not fixed. This Zenith is quoted anywhere from 10 gold 45 silver to 1 platinum 3 gold — a 9.88× swing — because the Goblin Tinkerer charges against the value of the modifier the item is wearing at that moment, and Legendary is the dearest one it can be wearing.

Holding out for one prefix in 40 is the most expensive way to do this. Accepting a second one takes the bill from 14 platinum 38 gold to 7 platinum 59 silver.

Without the Discount Card you are paying list price. The card alone takes this to 11 platinum 50 gold; the card with a 75% Tinkerer takes it to 8 platinum 63 gold — 40% off, which is the most the game allows.

How likely, and what it costs

Chance of having it	Reforges	Bill at that point
25%	12	4 platinum 29 gold
50%	28	10 platinum 6 gold
75%	55	19 platinum 78 gold
90%	91	32 platinum 75 gold
95%	119	42 platinum 84 gold
99%	182	65 platinum 54 gold

The bill is what you will have spent if it takes that many rolls. Reforge counts are exact; the bill is the average cost of that many rolls.

What the discounts are worth

Setup	Per reforge	Expected total	You save
Nothing	33 gold 33 silver	14 platinum 38 gold	0%
Discount Card only	26 gold 66 silver	11 platinum 50 gold	20%
A 75% Tinkerer only	25 gold	10 platinum 78 gold	25%
Both	20 gold	8 platinum 63 gold	40%

The Discount Card and the Greedy Ring are the same 20% and do not stack with each other. Happiness multiplies with the card, so the floor is 0.75 × 0.80 = 0.60 — 40% off, not 33%.

Prefix pools and their odds

Item type	Prefixes	Best	Coin-flip point
Swung melee	40	Legendary	28
Spears, yoyos, drills	14	Godly	10
Ranged	35	Unreal	24
Magic	36	Mythical	25
Summon	37	Fabled	26
Accessory	19	Menacing	13
Terrarian	15	Legendary	11

Pools are Desktop 1.4.5. Accessories have five joint-best prefixes — Menacing, Warding, Lucky, Quick and Violent all raise value by the same amount. An item whose knockback or speed a prefix cannot change drops that prefix, so some items roll fewer; that is what the Prefixes field is for.

The arithmetic, step by step

Sell value 20 gold = 200,000 copper

Base value = sell × 5 = 1,000,000 copper

Unmodified: floor((1,000,000 × 1.00 × 1.00 × 1.00) ÷ 3) = 333,333 copper

Average losing roll, over the 39 prefixes you would not keep = 360,272.82 copper

Attempts = 40 ÷ 1 = 40.0

Total = 333,333 + ((40 - 1) ÷ 1) × 360,272.82 = 14,383,973 copper

Grinding another random-cost table? The Minecraft enchanting calculator does the same job for the enchanting table.

Updated: August 12, 2026

Terraria reforge calculator. What the whole grind to a target modifier costs, in coins.

A Terraria reforge calculator works out the total coins the Goblin Tinkerer takes to land a target modifier, counting every failed roll on the way. Type in the item's sell value, its type and how many modifiers you would settle for, and it returns the expected total spend, the reforges on average and the coin-flip point where half of players are done.

What is a Terraria reforge calculator?

A Terraria reforge calculator turns the single price the Goblin Tinkerer quotes into the cost of the whole grind, odds included. Grinding a 20 gold Zenith to Legendary costs 14 platinum 38 gold 39 silver 73 copper and takes 40 reforges on average. The Goblin Tinkerer's window shows 33 gold 33 silver 33 copper, which is the price of one click. That single number is what the reforge tools on the web report, while the quantity a player is deciding about is the sum over a run whose length is random.

Those prices move because the quote depends on the modifier the item is already wearing. On that same Zenith the Goblin Tinkerer asks 10 gold 45 silver 33 copper while it is Broken and 1 platinum 3 gold 28 silver 23 copper once it is Legendary — a 9.88× swing between the cheapest and dearest quote in the pool. The official wiki puts the rule plainly: "Existing modifiers affect an item's value, so items with poor modifiers are cheaper to reforge, while reforging an already well-modified item will be more expensive." A single quote is a poor predictor of the bill.

The second thing that decides the bill is how many modifiers the item can roll at all. A sword, axe, pickaxe, hammer or whip draws from 40; a spear, flail, yoyo, boomerang or drill draws from only 14 and tops out at Godly. That is why a Paladin's Hammer can never come out Legendary no matter how much coin goes in: it is thrown rather than swung, so the game files it with the spears despite the name. A Minishark deals no knockback, so the 16 knockback prefixes drop out of its list and it rolls 19 instead of a normal gun's 35 — the same weapon price, the same 11 gold 66 silver 66 copper quote, and a bill 46 % lower than a Megashark's. The "Prefixes it can roll" field is pre-filled per item type and stays editable for exactly these cases.

The calculator reports four figures: the expected total spend, the reforges on average, the price per reforge with its full quote range, and the coin-flip point — the reforge number by which half of players have their modifier. Below those, one table shows what the bill looks like at 25 %, 50 %, 75 %, 90 %, 95 % and 99 % chance, a second prices the Discount Card and the Goblin Tinkerer's happiness against each other, and a third lists every item type's pool with its coin-flip point. Everything is pinned to Terraria Desktop 1.4.5 and runs in your browser as you type.

How to use the reforge cost calculator

The page opens on a Zenith at 20 gold sell value, so there is a real answer on screen before you touch anything. There is no Calculate button — every figure rewrites itself as you type.

1. Pick the item. The list carries the presets players grind most (Zenith, Terra Blade, Megashark, Minishark, Terraprisma, Last Prism, Terrarian, Solar Eruption, Ankh Shield and more), each of which fills in the sell value, the item type and the prefix pool for you. Choose "Something else" for anything not on the list.

2. Enter the sell value and its coin. The field asks for the Sell figure because that is the only money row a non-purchasable item's wiki infobox prints. The Goblin Tinkerer charges from the buy value, which is five times the sell value, and the calculator does that conversion for you.

3. Set the item type. The options are "Sword, axe, pickaxe, hammer, whip", "Spear, flail, yoyo, boomerang, drill", "Bow, gun, launcher", "Magic weapon", "Summon weapon", "Accessory" and "Terrarian". This decides both the pool size and the price mix of the misses.

4. Adjust "Prefixes it can roll" if your weapon is unusual. It defaults to the class total — 40, 14, 35, 36, 37, 19 or 15. Drop it to 19 for a Minishark or any other gun that deals no knockback.

5. Set "Prefixes you'd accept". This is the biggest lever on the page. Leaving it at 1 means holding out for the single dearest modifier; raising it to 2 halves the bill.

6. Answer the discount toggle. "Full price" or "Discount Card" — the Greedy Ring is the same 20 % and goes in the same slot, so pick "Discount Card" for either.

7. Type the Goblin Tinkerer's price percentage. It runs from 75 to 150. Whatever number his shop window shows is the number that belongs here.

8. Read the four cards, then the tables. The first card copies to the clipboard, and the address bar carries a permalink of anything you changed away from the defaults, so a link you share opens on your numbers rather than ours.

How the Goblin Tinkerer prices a reforge

The wiki states the base rule exactly: the Goblin Tinkerer "charges one-third of the item's current buy value, which is 5/3 (166.67%) of its sell price or 1/3 (33.33%) of its base value." For a Zenith listed at 20 gold sell, the buy value is 1 platinum and the unmodified quote is 33 gold 33 silver 33 copper.

The modifier already on the item multiplies that value, and the multiplier is squared. When the game applies a prefix it accumulates a factor from the stat changes and then multiplies that factor by itself before touching the item's value. Broken lands at ×0.3136 and Legendary at ×3.0985 on a swung melee weapon, which is where the ten-fold price swing comes from. Broken is the worst modifier in the game and appears in every pool except accessories.

Each roll is independent. The wiki is explicit that reforging has no memory: on each reforge there is an equal chance of getting any of the modifiers possible for that item, including the modifier it already has. Failing forty times in a row does not shorten the forty-first. That is what makes the arithmetic tractable — the number of rolls follows a fixed pattern that depends only on the pool size and how many modifiers you would keep.

Pool size is set by item class, and one class is smaller than players expect. Every weapon that takes a prefix can roll the 14 universal modifiers. Most also add the 10 common ones plus their own class list; a spear, flail, yoyo, boomerang or drill does not, and stays at 14 with Godly as its ceiling. Guns and bows are the odd arithmetic: 12 ranged modifiers plus 14 universal plus 10 common, minus Deadly, which ranged weapons cannot take because a separate ranged Deadly already exists — 35, not 36.

Accessories break the pattern completely. All 19 accessory prefixes raise the item's value, from ×1.1025 up to ×1.4400, so a modified accessory is always dearer to reforge than a bare one and the whole quote range spans 1.31× rather than roughly ten. Five of them tie for best at ×1.44 — Menacing, Warding, Lucky, Quick and Violent — so "the best accessory modifier" is a question about what you are building, not about odds.

One piece of interface behavior is worth knowing before you start clicking. The wiki notes that when an item receives its most expensive, and typically its best, modifier, "the reforge button is deactivated for 1 second to prevent accidentally skipping the 'best' modifier." On a fast grind that one-second pause is the game telling you to stop and read what you just landed.

The math behind the total

\text{Total} = P_0 + \frac{N - k}{k} \times \overline{P}_{\text{miss}}

$N$ = Prefixes it can roll — the size of the item's modifier pool. 40 for a sword, 35 for a gun, 37 for a summon weapon, 19 for an accessory, 14 for a yoyo or spear.
$k$ = Prefixes you'd accept — how many of those N you would keep and walk away with.
$P_0$ = The quote on the unmodified item: one third of five times its sell value, after any discount and the Goblin Tinkerer's happiness.
$\overline{P}_{\text{miss}}$ = The average quote across the prefixes you would reject, taken over the item class's own modifier list minus its k dearest. Lowering "Prefixes it can roll" corrects the odds, not the price mix — a Minishark's misses are still priced as a ranged weapon's.

A single reforge is priced by a chain of four truncations, applied in this order, where V is the sell value, m the multiplier of the modifier already on the item and h the Goblin Tinkerer's percentage:

P = \left\lfloor \frac{1}{3} \left\lfloor \left\lfloor \left\lfloor 5 V m \right\rfloor \times 0.8 \right\rfloor \times \frac{h}{100} \right\rfloor \right\rfloor

The ×0.8 step applies only with the Discount Card or the Greedy Ring. Each floor is a real truncation in the game's code, not a rounding convenience, which is why the coppers rarely land on a round number.

The grind is then a sum, not a single price. You pay the unmodified quote once, and after that every miss leaves a random unwanted modifier on the item, so each further click is quoted from the pool minus its k dearest entries. The expression above is the closed form of that sum — no simulation is involved. Substituting the default Zenith state, with N = 40, k = 1, an unmodified quote of 333 333 copper and an average miss price of 360 272.82 copper:

333\,333 + \frac{40 - 1}{1} \times 360\,272.82 = 14\,383\,973

That is 14 platinum 38 gold 39 silver 73 copper. The reforges on average is the plainer half of the same idea: N divided by k, which is 40 when you hold out for one modifier out of forty.

The coin-flip point and the whole "how likely, and what it costs" table come from a second expression — the number of reforges needed before the chance of having landed one of your k prefixes reaches c:

n_c = \left\lceil \frac{\ln(1 - c)}{\ln\left(1 - \frac{k}{N}\right)} \right\rceil

At c = 0.5 with 40 prefixes and one accepted, that gives 28 — well under the average of 40, because a handful of very unlucky runs drag the mean up. At c = 0.99 it gives 182. Reading both numbers together is the honest way to budget: 28 is the typical run, 182 is the one you want enough coin for.

Worked examples, with the real coin figures

A 20 gold Zenith to Legendary — the state the page opens on

Inputs: Zenith, 20 gold sell value, "Sword, axe, pickaxe, hammer, whip", 40 prefixes it can roll, 1 accepted, full price, Goblin Tinkerer at 100 %. The unmodified quote is 33 gold 33 silver 33 copper, it takes 40 reforges on average, and the expected total spend is 14 platinum 38 gold 39 silver 73 copper. Across the whole run the average click costs 35 gold 95 silver 99 copper, more than the opening quote, because most clicks are paid on an item that is already wearing something.

The coin-flip point is 28. Here is the full spread, exactly as the calculator prints it:

Chance of having it	Reforges	Bill at that point
25 %	12	4 platinum 29 gold
50 %	28	10 platinum 6 gold
75 %	55	19 platinum 78 gold
90 %	91	32 platinum 75 gold
95 %	119	42 platinum 84 gold
99 %	182	65 platinum 54 gold

The bill beside each row is the average cost of that many rolls, not the 90th percentile of the bill itself. Budget to the 90 % row — 91 reforges and 32 platinum 75 gold — if you want to start the grind and finish it in one sitting.

Megashark vs Minishark: same quote, 46 % different bill

Both guns sell for 7 gold, so both are quoted at 11 gold 66 silver 66 copper per reforge. The Megashark rolls the full 35 ranged prefixes; the Minishark deals no knockback, so the 16 knockback prefixes are removed from its list and it rolls 19. The quote is identical either way — the Minishark simply has 16 fewer ways to miss.

Gun	Prefixes it can roll	Coin-flip point	Expected total spend
Megashark	35	24	4 platinum 59 gold 36 silver 93 copper
Minishark	19	13	2 platinum 48 gold 68 silver 57 copper

That is the whole reason the "Prefixes it can roll" field is editable. If you look up a weapon and find it cannot take a stat that half the prefix list modifies, drop the number and watch the bill fall — the odds correct, while the price mix stays that of a ranged weapon.

The cheapest lever on the page is what you would settle for

Legendary is one prefix in forty. Godly, Demonic, Superior, Ruthless and Murderous are all perfectly good swords, and each one you add to the accepted set cuts the bill hard. On the default Zenith:

Prefixes you'd accept	Expected total spend	vs holding out for one
1	14 platinum 38 gold 39 silver 73 copper	0 %
2	7 platinum 59 silver 37 copper	−51 %
3	4 platinum 58 gold 48 silver 96 copper	−68 %
4	3 platinum 38 gold 49 silver 17 copper	−76 %
6	2 platinum 19 gold 74 silver 82 copper	−85 %
10	1 platinum 26 gold 33 silver 8 copper	−91 %
40	33 gold 33 silver 33 copper	one roll

Accepting a second prefix costs 7 platinum instead of 14. No discount, no NPC housing project and no farming route on the page moves the number that far.

40 % off is the floor, not the 33 % the guides print

Two multipliers apply, and they multiply rather than add. The Discount Card takes 20 % (the Greedy Ring is the same 20 %, and it contains the Card, so they never stack). Happiness bottoms out at 0.75 — the wiki's rule is that factors which make an NPC happy "will lower their prices for goods purchased from them, down to a minimum of 3/4 (75%)". Together, 0.75 × 0.80 = 0.60, which is 40 % off and the most the game allows.

Setup	Per reforge	Expected total spend	You save
Full price, Tinkerer at 100 %	33 gold 33 silver 33 copper	14 platinum 38 gold 39 silver 73 copper	0 %
Discount Card only	26 gold 66 silver 66 copper	11 platinum 50 gold 71 silver 66 copper	20 %
Tinkerer at 75 % only	25 gold	10 platinum 78 gold 79 silver 76 copper	25 %
Both	20 gold	8 platinum 63 gold 3 silver 74 copper	40 %

The penalty runs the other way just as far. An unhappy Goblin Tinkerer at 150 % turns the same grind into 21 platinum 57 gold 59 silver 65 copper, which is 50 % more than list. The full ladder on this Zenith reads 10 platinum 78 gold at 75 %, 11 platinum 50 gold at 80 %, 12 platinum 65 gold at 88 %, 14 platinum 38 gold at 100 %, 16 platinum 11 gold at 112 %, 17 platinum 97 gold at 125 % and 21 platinum 57 gold at 150 %. Moving him underground next to the Mechanic, whom he loves, and the Dye Trader is worth more than most players assume.

An Ankh Shield is the odd one out — accessories get dearer, not cheaper

Every one of the 19 accessory prefixes raises the item's value, from ×1.1025 to ×1.4400. There is no accessory equivalent of Broken, so an accessory that already has a modifier always costs more to reforge than a bare one, and the quote range is narrow: an Ankh Shield at 5 gold sell is quoted at 8 gold 33 silver 33 copper unmodified, and between 9 gold 18 silver and 12 gold once it is wearing something — a spread of 1.31×, against 9.88× on a sword.

The grind is short by weapon standards. With 19 prefixes and one accepted, the coin-flip point is 13 and the expected total spend is 1 platinum 98 gold 60 silver 38 copper. And because Menacing, Warding, Lucky, Quick and Violent all tie at ×1.44, five different prefixes are "the dearest one" — which is why a full Warding loadout is a famous grind and a mixed one is not.

Seven items side by side, all at full price with the Tinkerer at 100 %

Sell value sets the quote; the pool sets the number of clicks. Both matter, and they do not move together:

Item	Item type	Prefixes	Per reforge	Expected total spend
Zenith (20 gold)	Sword, axe, pickaxe, hammer, whip	40	33 gold 33 silver 33 copper	14 platinum 38 gold 39 silver 73 copper
Terraprisma (20 gold)	Summon weapon	37	33 gold 33 silver 33 copper	14 platinum 13 gold 54 silver 67 copper
Last Prism (10 gold)	Magic weapon	36	16 gold 66 silver 66 copper	6 platinum 74 gold 24 silver 66 copper
Megashark (7 gold)	Bow, gun, launcher	35	11 gold 66 silver 66 copper	4 platinum 59 gold 36 silver 93 copper
Terrarian (10 gold)	Terrarian	15	16 gold 66 silver 66 copper	2 platinum 89 gold 95 silver 61 copper
Solar Eruption (10 gold)	Spear, flail, yoyo, boomerang, drill	14	16 gold 66 silver 66 copper	2 platinum 54 gold 68 silver 45 copper
Ankh Shield (5 gold)	Accessory	19	8 gold 33 silver 33 copper	1 platinum 98 gold 60 silver 38 copper

The Last Prism and the Terrarian carry the same 10 gold sell value and the same 16 gold 66 silver 66 copper quote, and the Terrarian's grind costs less than half as much — 15 prefixes against 36. Grinding another random-cost table? The Minecraft enchanting calculator does the same job for the enchanting table.

Seven claims the guides get wrong

"The maximum discount is 33 %." It is 40 %. The endgame reforge guide at terraria.guide states "a 33% total discount" while the same page also says the difference between a happy and an unhappy Goblin "can save you 30-40% on every single reforge". The correct arithmetic is 0.75 happiness × 0.80 Discount Card = 0.60. On the default Zenith that is 8 platinum 63 gold 3 silver 74 copper instead of 14 platinum 38 gold 39 silver 73 copper.
"It takes about 20 tries on average." The same guide prints "landing your target prefix takes roughly 20 tries on average". When you hold out for one prefix, the average equals the pool size: 14, 15, 19, 35, 36, 37 or 40 depending on the item type. Twenty is the average of no item class in the game.
"Reforging costs the sell price divided by three." It costs the buy value divided by three, and the buy value is five times the sell price. Getting this wrong understates every figure by a factor of five — a 20 gold Zenith is quoted at 33 gold 33 silver 33 copper, not 6 gold 66 silver.
"The price is the same whichever prefix you land." The reforge tool at terraria.tools states this on its own prefix page. The wiki says the opposite and so does the game: on a Zenith the quote runs from 10 gold 45 silver 33 copper while Broken to 1 platinum 3 gold 28 silver 23 copper while Legendary.
"The odds improve the longer you fail." They do not. Every reforge draws from the full pool with equal chances, including the modifier the item currently has. A run of thirty misses changes nothing about the thirty-first click.
"The Discount Card and the Greedy Ring stack." Both give the same 20 %, and the Greedy Ring is crafted from the Discount Card, so it does not stack with anything in its own crafting tree. Wearing both wastes an accessory slot.
"Any melee weapon can roll Legendary." Thrown and spinning melee weapons — spears, flails, yoyos, boomerangs, drills — draw only the 14 universal modifiers and stop at Godly. This is why a Paladin's Hammer never comes out Legendary — it is thrown, not swung, so the game files it with the spears despite the name — and it is one of the most common questions on the Steam discussion boards.

Ways to cut the reforge bill

Widen the accepted set before you widen the wallet. Accepting two prefixes instead of one takes the default Zenith grind from 14 platinum 38 gold 39 silver 73 copper down to 7 platinum 59 silver 37 copper. Nothing else on the page is worth 51 %.
House the Goblin Tinkerer underground with the Mechanic and the Dye Trader. He loves the Mechanic, likes the Dye Trader, and likes the Underground, Cavern and Underworld biomes; that trio, with nobody else crowding him, is what pins him to the 75 % floor, the happiest an NPC can get. That is 25 % off, worth 3 platinum 59 gold on the default Zenith.
Wear the Discount Card, or the Greedy Ring — one of them. Either takes 20 %, and stacked on a 75 % Tinkerer the two multiply to 0.60. That is the cheapest reforge the game will ever quote you.
Read the quote, not the prefix name. Because a dearer modifier means a dearer quote, the price the Goblin Tinkerer asks is a live readout of what the item is wearing. The game even disables the reforge button for one second when it hands you the most expensive modifier in the pool, specifically so you do not click past it.
Check the pool before you spend a coin. Guns with no knockback drop 16 prefixes and finish in roughly half the clicks; a boomerang or yoyo has only 14 to begin with. Set "Prefixes it can roll" to what your weapon can genuinely land and the odds correct immediately.
Budget from the 90 % row, not from the average. The average of 40 reforges hides how long the tail is. Half of players are done by 28, and one in ten is still clicking at 91 — which is 32 platinum 75 gold on a Zenith. Take the higher number to the Goblin Tinkerer.
Accessories are the cheap grind, and five prefixes share the top spot. An Ankh Shield reaches its best modifier for 1 platinum 98 gold 60 silver 38 copper, and Menacing, Warding, Lucky, Quick and Violent all sit at ×1.44. Set "Prefixes you'd accept" to the ones your build actually wants rather than to one.
Starting from a Broken item saves you once, not every time. The opening quote drops from 33 gold 33 silver 33 copper to 10 gold 45 silver 33 copper, which is about 23 gold — and then the item is wearing something random again and the saving is gone. Against a 14 platinum bill it is a rounding error.

What the calculator does not claim

The bill beside each chance row is an average, not a percentile of the bill. The reforge counts in "How likely, and what it costs" are exact — 28 reforges is genuinely the point where half of players are done — but the coin figure next to each one is the average cost of that many rolls. Your own 91st reforge might cost more or less than the number in the 90 % row, because which unwanted modifiers you happened to sit on decides the price of each click.

Every total assumes you start from an unmodified item. The first quote is priced bare and every later one from the pool of misses. If your weapon already has a prefix, the first click costs whatever that prefix's row in the price range says instead.

The summon pool is 37 here, and that number is not settled. The wiki's modifier page gives summon weapons 13 of their own plus the common and universal lists, which totals 37. The reforge tool at terraria.tools serves 22 instead, dropping every universal prefix that moves critical strike chance — a coherent reading, since minions cannot land critical hits. Closing the question needs a decompile of the game's rollable-prefix routine at 1.4.5, which no public tModLoader patch exposes. The "Prefixes it can roll" field is editable for precisely this reason: type 22 and every figure recomputes.

Everything is pinned to Terraria Desktop 1.4.5. Console, mobile, old-generation and modded builds carry different prefix lists and different price rules. The reforge mechanic itself has been stable since 1.2, and the 1.4.5 update did not touch the reforge economy, so the numbers here are unlikely to move — but the badge on the calculator says which version they belong to.

Reforging is random and the calculator reports averages. Twenty-eight is a median, and half of all runs go longer — yours can end on the first click or drag past two hundred. Size the job before you walk to the Goblin Tinkerer: an Ankh Shield's best prefix is a 2 platinum errand, a Zenith's Legendary is 14 platinum, and 33 platinum if you budget to the 90 % row.

Terraria reforge cost — frequently asked questions

How much does it cost to reforge a weapon to Legendary in Terraria?

For a Zenith with a 20 gold sell value, the expected total spend is 14 platinum 38 gold 39 silver 73 copper at full price, across 40 reforges on average. With the Discount Card and the Goblin Tinkerer at 75 % it drops to 8 platinum 63 gold 3 silver 74 copper.

How many reforges does it take to get Legendary?

Forty on average, because a sword rolls 40 prefixes and Legendary is one of them. Half of players land it within 28 reforges, and one in ten is still going at 91.

Why does the reforge price change every time I click?

The Goblin Tinkerer charges one third of the item's current value, and the modifier the item is wearing multiplies that value. A Broken Zenith is quoted at 10 gold 45 silver 33 copper and a Legendary one at 1 platinum 3 gold 28 silver 23 copper — a 9.88× swing. That is also why the rising price is a hint you just landed something good.

What is the maximum reforge discount in Terraria?

Forty percent. The Discount Card or Greedy Ring takes 20 %, and a fully happy Goblin Tinkerer charges 75 %. The two multiply rather than add: 0.75 × 0.80 = 0.60. Many guides print 33 %, which is the number you get by adding them.

Do the Discount Card and the Greedy Ring stack?

No. Both give the same 20 % discount, and the Greedy Ring is crafted from the Discount Card, so it does not stack with anything in its own crafting tree. Equip one and use the slot for something else.

Does the chance of a good modifier go up the more I reforge?

No. Each reforge draws from the whole pool with equal chances, including the modifier the item already has. Thirty failures in a row do not improve the thirty-first attempt.

Why can't my Paladin's Hammer roll Legendary?

Thrown and spinning melee weapons — spears, flails, yoyos, boomerangs and drills — can only take the 14 universal modifiers, and the best of those is Godly. Set the item type to "Spear, flail, yoyo, boomerang, drill" and the calculator prices that 14-prefix grind instead: a 10 gold Solar Eruption reaches Godly for 2 platinum 54 gold 68 silver 45 copper.

Should I settle for a second-best modifier?

Usually yes, and the numbers are lopsided. Holding out for one prefix in 40 costs 14 platinum 38 gold 39 silver 73 copper; accepting any of the top two costs 7 platinum 59 silver 37 copper, and the top four costs 3 platinum 38 gold 49 silver 17 copper. Godly instead of Legendary keeps the same +15 % damage, +15 % knockback and +5 % critical strike chance — what it gives up is the +10 % size and the 10 % faster swing — for roughly half the coin.

Is the Minishark really cheaper to reforge than the Megashark?

Yes, by 46 %, even though both sell for 7 gold and both are quoted at 11 gold 66 silver 66 copper per reforge. The Minishark deals no knockback, so 16 knockback prefixes drop out and it rolls 19 instead of 35. Its expected total is 2 platinum 48 gold 68 silver 57 copper against the Megashark's 4 platinum 59 gold 36 silver 93 copper.

Which accessory modifier should I grind for?

Whichever your build wants, because five tie for best. Menacing, Warding, Lucky, Quick and Violent all multiply value by 1.44, so none of them is rarer or dearer than the others. If any of the five would do, set "Prefixes you'd accept" to 5 and watch the bill collapse.

How much coin should I have before I start reforging?

Take the 90 % row rather than the average. On a Zenith that is 91 reforges and 32 platinum 75 gold — the amount that gets nine players in ten to the finish in one sitting. Walking in with the 14 platinum average means a one-in-two chance of walking back out to farm more.

How accurate is this reforge calculator, and which version does it use?

It reproduces the game's price chain exactly, including all four truncation steps in the order the code applies them, and it solves the grind as a closed-form sum rather than simulating rolls, so the figures do not drift between page loads. Prefix multipliers and pool sizes are pinned to Terraria Desktop 1.4.5. Console, mobile, old-generation and modded builds differ.

Is this Terraria reforge calculator free?

Yes, with no account and no sign-in. Every figure is computed in your browser as you type, so the items and values you enter never leave your device. The address bar carries a permalink of the fields you changed, which you can paste into a Discord or forum thread.

Sources & References

Content verified by the Smart Calculators Team