Mutation Value Calculator
Pick an item value and tap the mutations rolled on it. Remember the game rule: multipliers add together — Silver 2x + Gold 4x sells for 6x, not 8x.
Last updated 2026-07-14
Tip: Dirty (0.8x) is the only mutation that lowers value — wash it off at the Cleaning Shop. Multiple mutations are rare but stack additively.
Sharing copies a permalink like ?item=1200&mut=silver,gold — anyone who opens it lands on your exact build.
New here? Start with the beginner’s guide.
How to use the value calculator
Start by typing the item’s base value into the top field — the price it would sell for with no mutations. If you don’t know it, use the in-game sell preview on a clean copy of the item. Then tap every mutation that rolled on your item. The result panel updates live: it shows the final sale price, the combined multiplier, a breakdown of each mutation you added, and the percentage gain over base value. Hit Roll to simulate a random mutation if you just want to see what a lucky drop is worth, or Share result to copy a permalink that reopens your exact build for anyone you send it to.
Worked examples
The one rule that trips people up: mutation multipliers add, they do not multiply. On a $1,200 base item, Silver (2x) plus Gold (4x) is 2 + 4 = 6x, so the item sells for $7,200 — not the $9,600 you would get if the multipliers stacked. A single Diamond (8x) on the same item is worth $9,600 on its own, which is why chasing one high-tier roll often beats hoping for two mid rolls. At the extreme, a Secret (50x) on a $1,200 item is $60,000 from one lucky container.
Tips for getting the most value
Base value matters more than the multiplier. A 2x on a $12,000 antique ($24,000) beats a 15x Hologram on a $500 trinket ($7,500), so always weigh the multiplier against what it is multiplying. Clean off a Dirty (0.8x) mutation at the Cleaning Shop before selling — unless a positive mutation is also on the item, in which case check here first so you don’t lose the good roll. And if you are not sure whether a mutation is worth holding, cross-reference it on the mutation tier list or read how each one drops on the mutations guide. If the item is also getting graded at the Shopping Mall, run the result through the grading calculator too, since mutations and grades multiply the price separately.
Frequently asked questions
Do Storage Hunters mutations stack by adding or multiplying?
They add. If an item rolls Silver (2x) and Gold (4x), the combined multiplier is 2x + 4x = 6x on the base value, not 8x. The calculator sums every selected multiplier.
Which mutation lowers an item’s value?
Only Dirty (0.8x) reduces value. You can wash it off at the Cleaning Shop to restore the base price before selling.
What is the most valuable mutation?
Secret at 50x is the single most valuable mutation, followed by Void at 35x. Both are extremely rare random rolls.
Reading the breakdown panel
The result panel does more than show a final price. The breakdown lists every mutation you added with its individual multiplier, so you can see exactly how the total was reached — useful when a stack surprises you. The combined multiplier line shows the summed figure the game actually applies, and the delta shows how much more the item is worth versus its untouched base value. If a number looks off, it is almost always the additive rule at work: two 4x mutations make 8x, not 16x. When you find a build worth remembering, use Share to copy a permalink that reopens these exact inputs for anyone you send it to.
Where these multipliers came from
The 23 multipliers this calculator uses are compiled from community sources and cross-checked between them — they are not numbers we measured at the sell counter, and we are not going to claim they are. Every value matches, item for item, the independent lists published by Nerdschalk and allthings.how, and both state the additive stacking rule the same way.
That rule is the whole point of this tool: multipliers add rather than multiply, so Silver (2x) + Gold (4x) is 6x, not 8x. The base price is whatever you type in — we hold no item price list, because no published one exists. If the developer ever changes how mutations combine, or publishes real figures, the formula here gets updated first.
Sourced 2026-07-14 · Maintained by Jim Liu