About the Average Inventory Calculator
Average inventory value over a period from beginning and ending inventory (or several period counts).
Also known as: mean inventory, average stock level.
How to use this calculator
- Enter beginning + ending inventory, number of counts.
- 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
Average inventory = Beginning + ending inventory ÷ Number of counts
Worked example
Using the values pre-filled in the calculator above:
- Beginning + ending inventory = 200,000
- Number of counts = 2
the calculator returns:
- Average inventory: 100,000
Working
Average inventory = 200,000 ÷ 2 = 100,000