Inventory shrinkage is the stock a business’s records say it has but that is no longer there — lost to theft, damage, spoilage, waste or recording errors — measured as recorded inventory minus physically counted inventory.
Inventory shrinkage
Also called shrinkage, shrink, stock loss, shrinkage rate ·
Inventory shrinkage is the stock that has disappeared between what your records say and what is on the shelf. If your system shows 40 bottles of shampoo and you count 36, you have 4 bottles of shrinkage. Some of it has a clear cause — a dropped tray, an expired pastry — and some of it does not. Either way it is stock you paid for and will never sell.
How to calculate shrinkage
A worked example
A clothing boutique’s system says it holds $12,500 of stock at cost at the end of the quarter. A full count finds $12,050. Shrinkage is $12,500 − $12,050 = $450. Sales for the quarter were $30,000, so the shrinkage rate is $450 ÷ $30,000 = 1.5% of sales.
To see what that costs, compare it with profit rather than sales. If the boutique’s gross margin is 55%, it needs about $820 of extra sales ($450 ÷ 0.55) just to earn back the gross profit lost to shrinkage. The calculation works the same in any currency.
Where shrinkage comes from
| Cause | What it looks like | What helps |
|---|---|---|
| Customer theft | Small, high-value items missing from open displays | Keep them near the counter or behind glass; staff on the floor |
| Staff theft | Cash and stock gaps on the same shifts; unexplained voids or discounts | Individual logins, permission limits on voids and discounts, regular review |
| Recording errors | One item up, a similar item down by the same amount | Scan barcodes instead of picking from a list; check deliveries against invoices |
| Damage and spoilage | Breakages, expired food, stock ruined in storage | Record it as waste or damage when it happens, not at the next count |
| Supplier shortfalls | Deliveries smaller than the invoice | Count deliveries on arrival before signing |
Why shrinkage matters for a small business
Shrinkage is a direct hit to profit: every missing unit is a cost with no revenue against it. It also corrupts every other inventory decision. If the records say 10 are in stock and only 6 are, the reorder alert fires late, the shelf runs empty, and the profit report overstates what you earned. A café that does not record waste will see its ingredient costs creep up without knowing why; a shop that never counts may be reordering items that walked out the door.
The most useful split is between known loss — waste and damage recorded when it happens — and unknown loss, the part that only appears when you count. Known loss is a cost of doing business you can manage. Unknown loss is the part to investigate, because it points to theft or broken processes.
Common mistakes
- Never counting. Shrinkage is invisible until you do a physical count; counting your most valuable or fastest items weekly catches most of it.
- Overwriting stock without a reason. Correcting a count without recording why hides the pattern you need to see.
- Assuming it is theft. Receiving and selling errors are often the bigger cause, and they are cheaper to fix.
- Mixing cost and retail values. Value shrinkage at cost if you compare it with cost of goods sold, and be consistent from period to period.
- Not recording waste as it happens. Waste logged at the time is known loss; waste found at the count looks like theft.
How it relates to other terms
Shrinkage is the difference between the two ways of measuring cost of goods sold: the count-based method includes it, the per-sale method does not. It erodes gross profit margin directly, and it silently eats into safety stock, which is why stockouts are often the first sign of a shrinkage problem.
Questions
- How do you calculate inventory shrinkage?
- Subtract the stock you physically count from the stock your records show, in units or in value at cost. To get a shrinkage rate, divide the shrinkage value by sales for the same period and multiply by 100.
- What causes inventory shrinkage?
- Inventory shrinkage is caused by customer theft, staff theft, recording and receiving errors, damage, spoilage and supplier deliveries that are short of the invoice. Recording errors and unrecorded waste are often as large a cause as theft.
- Is waste the same as shrinkage?
- Waste is one part of shrinkage. Waste and damage recorded when they happen are known losses, while the unexplained gap found during a stock count is the part usually investigated as shrinkage.
- How often should a small business count stock to catch shrinkage?
- Count high-value and fast-moving items weekly or every two weeks, and do a full count at least every quarter. Frequent small counts find problems sooner and are easier to fit into a working day than one large count.
Keep reading
- GlossaryCost of goods sold (COGS)Cost of goods sold (COGS) is the direct cost of what you sold. The formula, a worked example, common mistakes, and how COGS drives your gross margin.
- GlossarySafety stockSafety stock is the buffer that stops you running out when sales spike or deliveries slip. Three ways to calculate it, a worked example and common mistakes.
- GuideHow to track inventory for a small businessTrack inventory by recording every stock movement with a reason, counting on a schedule, and reordering at a calculated reorder point. Worked examples inside.
- FeatureInventoryFree, browser-based inventory software: stock that drops with every sale, adjustments with a reason, low-stock alerts and suggested reorder quantities.
- FeatureTeam & rolesInvite your team at no per-user cost and decide what each person can do — void sales, adjust stock, close the drawer, see reports — with 29 permissions.
Run your business from one screen
Free during early access: POS, inventory, booking, an online store and reports included. No credit card, no per-user fees, set up in minutes in your browser.