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Inventory shrinkage calculator

Measure inventory shrinkage as a percentage and value from book vs counted stock.

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Need Shrinkage (%), Value lost? The Inventory shrinkage calculator derives it from Recorded stock value ({cur}), Physically counted value ({cur}) in one step. For instance, with Recorded stock value ({cur}) = 10,000 and Physically counted value ({cur}) = 9,500 it returns Shrinkage (%) = 5% and Value lost = $500.00.

How to use it

  1. Enter your values: Recorded stock value ({cur}), Physically counted value ({cur}).
  2. Read the result instantly: Shrinkage (%), Value lost.

Frequently asked questions

How does the Inventory shrinkage calculator work?

It takes Recorded stock value ({cur}) and Physically counted value ({cur}) and derives Shrinkage (%) and Value lost from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

2 values: Recorded stock value ({cur}) and Physically counted value ({cur}). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Recorded stock value ({cur}) = 10,000 and Physically counted value ({cur}) = 9,500, the calculator returns Shrinkage (%) = 5% and Value lost = $500.00. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Recorded stock value ({cur}) = 20,000 and Physically counted value ({cur}) = 19,000 instead, Value lost goes from $500.00 to $1,000.00 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Recorded stock value ({cur}) = 5,000 and Physically counted value ({cur}) = 4,750, Value lost comes out at $250.00. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Running the week: issuing an invoice or a quote, knowing what is in stock and what to reorder, and seeing whether cash covers what is due.

What is the most common mistake?

Reading profit as cash. A profitable month with sixty-day payment terms can still leave the account empty — the two numbers answer different questions.

Is there a tool for the next step?

Inventory period calculator is the closest one after this: Days Inventory Outstanding — how long stock sits before it sells: average inventory ÷ cost of goods sold × days, or simply days ÷ inventory turnover if you already know the ratio. Lower is faster turnover and better cash flow.

What else is worth having open alongside it?

Inventory turnover calculator and Reorder point calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from, and how current are they?

The arithmetic is exact for what you enter. Invoice content, VAT treatment and mandatory mentions are set by national rules — an invoice that computes correctly can still be non-compliant.

Further reading

All guides →
ExplainerProcess Capability: Cp, Cpk and What Six Sigma Actually ClaimsCp compares the spec width to the process spread; Cpk penalises being off-centre. A process can have an excellent Cp and still make scrap — here is the case, with defect rates computed from the normal distribution rather than read off a table.ComparisonFIFO vs LIFO: What Actually Changes, and What Does NotFIFO and LIFO are assumptions about which cost you attach to a sale, not about which box leaves the warehouse. Worked through identical purchases and sales, they move cost of sales, inventory, profit and tax — but operating cash before tax is identical to the cent.ExplainerGMROI: the Inventory Number That Outranks MarginGross margin return on inventory investment divides gross margin by the cash tied up in stock. It exists because margin alone ranks products wrongly: a 60% margin turning twice a year loses to a 25% margin turning twelve times.ExplainerThe EOQ Square-Root Formula, and Where It Stops Being TrueEOQ = √(2DS/H) balances ordering cost against holding cost. Its most useful property is how flat the cost curve is around the optimum — and its four failure modes are quantity discounts, lumpy demand, a finite replenishment rate, and the two inputs nobody can measure.GuideCosting the Return of an Internal Project That Generates No RevenueThe migration, the tooling change, the process fix: the most common business case there is and the least documented. The value is avoided cost plus recovered time — and on a $130,000 migration, 60.5 % of the recovered hours have to be genuinely redeployed before the five-year net present value even reaches zero.ExplainerWhy the Payback Period Lies When the Cash Flows Are UnevenIt throws away everything after the cut-off, ignores the time value of money, and ranks a project that returns early and then dies above one that returns steadily. Computed: payback prefers the worse project by 1.33 years while net present value prefers the better one by $19,571. And the popular shortcut — one divided by the payback — overstates the true return by 17 points on a five-year asset.