Stockout Loss Calculator
Enter how much a product normally sells and how long it's been out of stock to see exactly what that stockout is costing you, in lost revenue, lost profit and missed units.
Your product
Lost revenue
€7,000
Sales you missed while out of stock
Lost profit
€3,150
Lost revenue × your gross margin
Missed units
140
Units you would have sold
Revenue per day
€1,000
What this product earns in stock
What this means: A 7-day stockout on this product costs about €7000 in sales and €3150 in profit. Multiply that by how often it happens across your catalog.
How to calculate and prevent stockout losses
A stockout costs you the sales you would have made while the product was unavailable. To estimate it, multiply your normal daily units by the price per unit to get daily revenue, then multiply by the number of days out of stock. Apply your gross margin to that figure and you have the lost profit, the number that actually hits the bottom line.
The headline figure understates the real damage. When shoppers can't buy from you they buy from a competitor, and some of them never come back, so a stockout quietly costs you future orders too. Any ad spend pointing at an unavailable product is wasted, and marketplaces and search engines tend to demote out-of-stock listings, which suppresses visibility long after you've restocked.
Preventing stockouts comes down to two things: forecasting demand and trusting your inventory data. Reorder points and safety stock based on real sales velocity and supplier lead times stop the obvious gaps, but most stockouts actually trace back to data that was wrong or updated too late, stock levels that didn't reflect reality across every channel you sell on.
Calculating the cost of one stockout after the fact doesn't help the next one. WISEPIM's stockout-loss analytics watches every SKU across your whole catalog, surfaces the ones trending toward zero and quantifies the revenue at risk, so you're warned in time to reorder, not left counting the orders you already lost.
You measured one product's stockout cost.
This is one SKU. WISEPIM's stockout-loss analytics watches every product in your catalog, flags the ones at risk and quantifies the revenue you'd lose, so you get warned before they sell out, not after.
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Frequently asked questions
How do I calculate lost sales from a stockout?
Multiply the units you'd normally sell per day by the price per unit to get daily revenue, then multiply by the number of days the product was out of stock. Multiply that lost revenue by your gross margin to see the lost profit. 20 units a day at €50 over 7 days is €7,000 in missed revenue.
What is the true cost of a stockout?
The missed sale is only the start. Stockouts push shoppers to competitors and some never come back, so you lose future orders too. Any ad spend driving traffic to an unavailable product is wasted, and search engines and marketplaces tend to demote out-of-stock listings, which lowers your ranking long after the product returns.
How do I prevent stockouts?
Prevention comes down to forecasting demand and trusting your inventory data. Set reorder points and safety stock based on real sales velocity and supplier lead times, and keep stock levels accurate and synced everywhere you sell. Most stockouts trace back to data that was wrong or updated too late rather than genuine demand spikes.
What is a typical stockout rate and why does it matter?
Retail out-of-stock rates commonly sit around 5-10%, and even a few percent quietly erodes revenue and customer trust across a large catalog. Because the loss is invisible, you never see the orders that didn't happen, it stays hidden until you measure it. WISEPIM flags at-risk SKUs across your whole catalog so you can act before they sell out.
How many days of safety stock should I hold?
Cover your supplier lead time plus a buffer sized to how much your daily sales swing. A product that sells 20 units a day with a 14-day lead time needs at least 280 units on hand at reorder, and a faster mover or a less reliable supplier needs more. This calculator shows what each day of empty shelf actually costs, which is the number to weigh against the cost of carrying that extra stock.
Does a stockout hurt my marketplace ranking?
Yes. Amazon, Bol and Google all favour reliably available listings, so going out of stock can drop your position, suppress the Buy Box and reset hard-won sales velocity. The ranking does not snap back the moment you restock, so the real loss runs past the days you were unavailable. Keeping stock accurate across every channel is the cheapest way to protect that placement.