About the Inventory Shrinkage Calculator
Shrinkage rate: inventory lost to theft, damage or error as a percentage of recorded stock or sales.
Also known as: shrink rate, inventory loss, stock shrinkage.
How to use this calculator
- Enter value of missing inventory, recorded inventory or sales.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Open “Step-by-step” to see how the answer was worked out.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Shrinkage rate = Value of missing inventory ÷ Recorded inventory or sales × 100
Worked example
Using the values pre-filled in the calculator above:
- Value of missing inventory = 8,400
- Recorded inventory or sales = 420,000
the calculator returns:
- Shrinkage rate: 2%
Working
Shrinkage rate = 8,400 ÷ 420,000 × 100 = 2%