Dead Stock Calculator

Whether a single item shows the warning signs commonly associated with dead stock — a long gap since its last sale, low recent sales, and meaningful cash tied up — using clear, disclosed rules rather than a black box. The result is a risk classification, never a certainty.

Inventory Value = Units on Hand × Unit Cost

The risk classification (Low Risk, Watch, High Risk, or Possible Dead-Stock Risk) is based on units sold in the last 90 days and days since the last sale (or overall inventory age, for items that have never sold).

84 units on hand, $26 unit cost, 143 days since the last sale, 0 units sold in the last 90 days:

• Inventory Value = 84 × $26 = $2,184
• 143 days since last sale → High Risk

This item has 84 units on hand, has not sold in 143 days, and represents $2,184 of inventory cost.

“Possible dead-stock risk” (the classification one tier past High Risk) is a prompt to look closer, not a final verdict — check whether the product is seasonal, whether a markdown could still move it, and how much margin remains. Sales patterns vary by category and season: a 150-day gap is unremarkable for some slow-turning categories and alarming for others, so never treat this classification as a guaranteed diagnosis.

Dead stock is inventory that has stopped selling — or never sold at all — and represents cash that's no longer available for anything else. Unlike inventory that's simply slow, dead stock shows no realistic near-term path to selling at full price.

A concrete example: a boutique buys 30 units of a seasonal item. Six months later, 18 remain and sales have effectively stopped. Those 18 units represent inventory capital that can't be used to buy better-performing products — the cash is sitting on a shelf, not in the register.

There's no single universal dead-stock formula, because “dead” means different things in a fast-turning category versus a slow one. Instead, a few signals together tell the real story:

• Inventory age — how long the current stock has been on hand.
• Days since the last sale (or since the item arrived, if it has never sold).
• Recent sales velocity — how fast it's actually moving right now, not historically.
• Sell-through — units sold relative to units received.
• Units remaining and their cost — how much cash is actually at stake.
• Expected future demand for the category or season, based on what you already know about the product.

The calculator above uses the two cheapest, most universal signals — days since last sale and units sold in the last 90 days — against inventory value. It doesn't predict future demand; it applies fixed, disclosed thresholds to what has already happened.

The number this calculator shows (units on hand × unit cost) is only the starting point. A few other costs stack on top of it:

• Inventory capital tied up. The cash you spent to acquire the units still sitting unsold — money that can't be redeployed into inventory that actually turns.
• Carrying costs. Storage, insurance, and shrinkage add an ongoing cost on top of the purchase price, typically for as long as the units remain unsold.
• Space. Shelf or warehouse space occupied by dead stock isn't available for inventory that would actually sell.
• Opportunity cost. Cash and space committed to dead stock can't be used to buy or display better-performing products.
• Margin erosion from delayed markdowns. The longer a decision is put off, the more likely the eventual price cut needs to be deeper just to move the units at all.

These are the mechanisms, not a guaranteed dollar figure — the actual cost depends on your storage arrangement, category, and how long the stock sits before you act.

The distinction matters because the right response is different. Slow-moving inventory is still finding buyers — just more slowly than you'd like — so a lighter-touch action like a moderate markdown or a bundle can often restore healthy turnover without giving up much margin. Dead stock has little or no meaningful movement over an extended period, so waiting rarely changes the outcome; it just delays a decision that's already needed.

There's no single universal number of days that separates the two — it depends heavily on category and typical turnover. Try the free Slow Moving Inventory Calculator on an item that's still selling but slower than expected, to see where it falls before assuming it's dead.

• Over-ordering relative to actual demand, often based on a forecast that didn't hold up.
• A shift in trends or a seasonal item that missed its selling window.
• Poor assortment decisions — too many similar variants competing for the same demand.
• Pricing that's no longer competitive for the category.
• Weak merchandising — the product simply isn't seen by enough buyers.
• Inaccurate forecasting, especially for new or newly-trending products with no sales history.
• Supplier minimum order quantities that force buying more than you actually need.

There's no single correct action for every SKU — the right response depends on remaining margin, how much cash is at stake, and whether the product still has any realistic path to selling. In roughly the order they're worth trying:

• Reposition or re-merchandise. Move it somewhere more visible, or pair it with better product photos or placement, before touching the price.
• Promote or bundle. A multi-buy offer or a bundle with a faster-moving item can move units without a straight price cut.
• Reduce or stop reordering. Sometimes the correct action is simply not buying more — letting existing stock finish selling through on its own.
• A controlled markdown. A price cut sized to move inventory while preserving as much margin as possible — not a reflexive discount.
• Clearance or liquidation. For stock that's unlikely to sell any other way, where the goal shifts from “sell at a good price” to “recover cash and free up space.”

Read Dead Stock Inventory: What It Is and How to Identify It for the fuller decision framework behind these options.

Running this calculation one item at a time is realistic for a handful of SKUs. It stops being realistic across a few hundred or a few thousand. Inventory Assassin is dead-stock detection software built for that scale: it reads your existing inventory data and evaluates the same kind of signals covered above — inventory age, time since last sale, recent sales velocity, sell-through, inventory cost, and how financially material each item is — across every SKU at once.

Rather than a flat list, it prioritizes which inventory actually deserves attention first and recommends a specific, practical next action for each — a markdown sized to protect margin, a bundle, reduced reordering, or liquidation — instead of leaving that judgment call to you, product by product. Inventory Assassin does not predict future demand or guarantee a recovery amount; it applies the same disclosed logic as this calculator, consistently, across your whole catalog.