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Out-of-stock rate measures how often shoppers find a product unavailable when they want to buy it. It is usually expressed as the share of your products that are unavailable at a given moment. A high rate means you are advertising things you cannot sell. Every one of those visits is demand you already paid to attract, then turned away.
Picture a shop where one shelf in every twelve is empty. Customers still walk in, and some walk straight back out again.
Online the empty shelf is worse, because the shopper is one click from a competitor. There is no travel cost to abandoning you.
The simple version counts products. Divide the number of unavailable products by your total products, then multiply by 100.
If 60 of your 1,200 listings are unavailable, your out-of-stock rate is 5%. That figure is easy to pull and easy to misread.
The problem is that it treats every product as equal. Sixty dead slow movers barely matter, while six missing bestsellers can wreck a month.
So weight it by demand instead. Measure the share of product page views that landed on an unavailable item, which reflects what shoppers actually wanted.
Running out is rarely one failure. Five causes account for most of it, and they need different fixes.
The fourth cause is the sneaky one. It produces phantom stock, where the store cheerfully accepts orders for goods nobody can pick.
Shrinkage feeds that directly. The National Retail Federation attributed 65% of shrink to theft, and every unrecorded loss inflates your on-hand figure.
The lost sale is only the visible part. Shoppers who hit a stockout frequently leave the whole basket behind.
Zebra Technologies surveyed 4,811 shoppers worldwide and found 39% left without buying anything because of out-of-stock items.
Notice that they abandoned the entire trip, not just one item. The stockout cost the whole basket rather than a single line.
Then there is the second visit that never happens. A shopper who found what they needed at a competitor has no reason to check you first next time.
Paid traffic makes it worse again. Advertising a product you cannot ship means paying for the click and losing the sale.
Stockouts cannot be eliminated, so the page itself has to work harder. A bare “out of stock” message throws the visit away.
A back-in-stock notification is the highest-value of the four. The shopper has told you exactly what they want, which is far stronger than a generic newsletter signup.
Those signups also double as demand data. A queue of 200 people waiting is the clearest reorder signal you will ever get. SaveTo Wishlist Pro handles these alerts automatically.
Prevention beats recovery, though it costs working capital. The trick is spending that capital only where it earns its keep.
Lead time deserves particular attention. Suppliers quote an optimistic figure, and reorder points built on that quote fail every time there is a delay.
Use your own observed lead times instead. If a supplier promises 14 days and averages 21, plan around 21.
The phantom stock problem is worth solving first, because it is free. Cycle counting a small slice of stock each week catches the discrepancies that create it.
Imagine a running gear store called Pacefield. They stock 1,200 products, mostly shoes and apparel across many size variants.
Their reported out-of-stock rate is 5%, which sounds tolerable. Sixty listings unavailable out of 1,200 looks like a rounding error.
Then they weight it by traffic. Those 60 listings account for nearly a fifth of all product page views.
The reason is obvious in hindsight. Popular sizes in popular shoes sell out first, and those are exactly the pages people visit.
Pacefield split their catalogue by demand rather than treating it uniformly. The top 100 products get higher safety stock and tighter reorder points.
Slow movers get the opposite treatment. Letting those run down frees cash that was funding the wrong shelves.
Then they rebuild the out-of-stock page. Instead of a dead end, it offers a notification signup and shows the same shoe in nearby sizes.
The headline rate barely moves, and that is the interesting part. It sits around 4% because slow movers are now allowed to run out.
The demand-weighted rate is what improved. Far fewer visitors now land on something they cannot buy.
The signup list becomes unexpectedly useful too. Pacefield start reordering based on who is waiting, rather than guessing from last season.
They also pause ads for unavailable products. Because paid clicks to a stockout page waste budget twice, the saving is immediate.
One surprise emerges from the alternatives block. Shoppers offered a nearby size frequently take it, which had never been tested before.
That works because the intent was never really about the exact variant. Somebody wanting running shoes wants running shoes, not a specific stock code.
Pacefield now treat the stockout page as a real page rather than an error state. It has a job to do, and it does it.
Sell-through rate measures how much of your received stock you actually sold. It rewards stock that moves.
Out-of-stock rate measures the opposite failure. It counts the moments you had nothing to sell.
Read alone, either one misleads. A perfect sell-through of 100% usually means you ran out and left money behind.
Together they describe the balance you are aiming for. High sell-through with a low demand-weighted stockout rate is the combination worth chasing.
Cart abandonment sits behind both. With average abandonment already around 70.22%, adding an availability problem on top is expensive.
There is no universal figure, because the right level depends on margins and lead times. Low-margin goods with fast resupply can tolerate more stockouts than high-margin goods with long lead times.
Your own trend matters more than a benchmark. Track the demand-weighted version monthly and aim to bring it down over time.
Usually not, because hiding the page throws away its rankings and any links pointing at it. Rebuilding that position later costs far more than leaving the page up.
Move unavailable items down in category listings instead. Shoppers browsing a category should see what they can buy first.
For inventory purposes yes, since you have no units on hand. Commercially it is a different situation, because the sale still happens.
Track them separately for that reason. A backorder you fulfil on time is a success, while an unfulfilled one becomes a refund.
Out-of-stock rate is only useful once you weight it by demand, because not all empty shelves cost the same. Protect your bestsellers, let slow movers run down, and make every stockout page capture the demand instead of wasting it.
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