Planning calculator
Inventory Turns Calculator
Measure how quickly inventory is consumed or sold relative to the value held on hand.
What this calculator does
- Calculate inventory turnover and days inventory on hand from COGS and average inventory.
- Use when working capital and stock levels need a simple metric.
- Calculate inventory turnover and days inventory on hand from COGS and average inventory.
Formula used
- Average inventory = (beginning + ending inventory) ÷ 2
- Inventory turns = COGS ÷ average inventory
- Days inventory = days in period ÷ turns
Inputs explained
- Annual cost of goods sold: undefined
- Beginning inventory: undefined
- Ending inventory: undefined
- Days in period: undefined
How to use the result
- Use when working capital and stock levels need a simple metric.
- This is a planning calculator. Validate assumptions against your process data before using the result as a final quote, schedule, or engineering decision.
Common questions
- Which inputs usually drive the inventory turns result? annual cost of goods sold, beginning inventory, ending inventory, and days in period usually have the biggest effect. When one of those assumptions changes, rerun the calculator and compare the new turns / yr result before updating the plan.
- What does the inventory turns calculator do? Calculate inventory turnover and days inventory on hand from COGS and average inventory.
- What inputs do I need for the inventory turns calculator? You need annual cost of goods sold, beginning inventory, ending inventory, and days in period. Use measured values from your line, quote package, supplier data, or current production plan whenever possible.
- How should I interpret the inventory turns result? Treat the turns / yr output as a planning estimate for planning work. Compare it against process history, quoted assumptions, and operating limits before making final decisions.
Last reviewed 2026-05-12.