Free Shrinkage Calculator
Inventory shrinkage rate formula
Enter beginning inventory, purchases, COGS, and actual physical count value to calculate inventory shrinkage amount and shrinkage rate %. Instant Good / Watch / Needs Attention rating.
Inventory value at the start of the period
Total value of stock received during the period
At cost price, not selling price
Value counted during physical stock take
Expected Inventory = Beginning Inventory + Purchases − COGS
Shrinkage = Expected Inventory − Actual Physical Count
Shrinkage Rate% = Shrinkage ÷ (Beginning Inventory + Purchases) × 100
Benchmarks: Good <1% · Watch 1–2% · Needs Attention >2%
What Is an Inventory Shrinkage Calculator?
An inventory shrinkage calculator computes the gap between your expected book inventory and your actual physical count — and expresses it as a percentage. Shrinkage represents stock lost to theft, damage, spoilage, or administrative errors. By calculating your shrinkage rate regularly, you can benchmark performance against industry averages, detect trends early, and take corrective action before losses compound. Formula: Shrinkage Rate% = Shrinkage ÷ (Beginning Inventory + Purchases) × 100.
How to Calculate Inventory Shrinkage
Step 1 — Enter Beginning Inventory and Purchases
Enter the value of inventory at the start of your period (beginning inventory) and the total cost value of all stock received during the period (purchases). These two together represent the total inventory that should be accounted for.
Step 2 — Enter COGS
Enter the Cost of Goods Sold (COGS) for the period — this is the cost value of goods legitimately sold, not the selling price. Expected Inventory = Beginning Inventory + Purchases − COGS.
Step 3 — Enter Actual Physical Count
Enter the total value of inventory counted during your physical stock take. The calculator will show the shrinkage amount, shrinkage rate %, and a Good / Watch / Needs Attention interpretation.
Who Uses This Shrinkage Calculator?
Retail Store Managers
Calculate shrinkage rate after each physical count and track whether controls are improving or deteriorating over time.
Finance & Audit Teams
Quantify inventory losses for financial reporting and identify periods or locations with unusually high shrinkage for investigation.
Loss Prevention Teams
Use shrinkage data to justify investment in loss prevention controls and demonstrate ROI after implementing new measures.
Warehouse Supervisors
Monitor shrinkage between cycle counts to catch discrepancies early before they compound into large write-offs.
Frequently Asked Questions
What is inventory shrinkage?
Inventory shrinkage is the difference between your expected (book) inventory and your actual physical count. It represents stock that has been lost through theft (internal or external), administrative errors, supplier fraud, or damage and spoilage.
How is shrinkage rate calculated?
Shrinkage Rate % = (Shrinkage Amount ÷ (Beginning Inventory + Purchases)) × 100. A 1% shrinkage rate means you lost 1% of all inventory that passed through your business during the period.
What is a good inventory shrinkage rate?
Below 1% is generally considered good. Between 1–2% warrants closer attention. Above 2% is high and requires investigation. The retail industry average is around 1.4% (NRF Retail Security Survey).
What are the main causes of inventory shrinkage?
The four main causes are: shoplifting/external theft (~37%), employee/internal theft (~29%), administrative and process errors (~21%), and vendor fraud (~6%). The remaining ~7% is unknown. Source: National Retail Federation.
How can I reduce inventory shrinkage?
Implement regular cycle counting, use CCTV and access controls, reconcile purchase orders to received goods, train staff on inventory procedures, and conduct random stock audits. Early detection through regular counting is the most effective prevention tool.
Is this shrinkage calculator free?
Yes, completely free with no account or login required.