Inventory Health Calculator
Enter cost of goods sold, inventory value, and unit counts once, and see inventory turnover, days sales of inventory, sell-through rate, and stockout rate together, since overstock and understock problems often show up in the same numbers, just from opposite directions.
Turnover
Stock Levels
Results
Inventory Turnover
Days Sales of Inventory
Sell-Through Rate
Stockout Rate
What This Means
Inventory turns over 4.0 times a year, sitting on shelves for about 91 days on average. Sell-through rate is 70.0%, healthy, but a 8.0% stockout rate suggests some of the catalog's better sellers are running out faster than they're being replenished.
Why It Matters
A business can be overstocked on some SKUs and stocked out on others at the same time, a pattern that's invisible if turnover or stockout rate are checked in isolation. Seeing all four numbers from the same period makes it clear whether the core issue is too much inventory sitting still, or not enough of what's actually selling.
Example
A store has $600,000 in cost of goods sold against $150,000 in average inventory, received 500 units and sold 350, and has 40 SKUs out of stock out of 500 total. Inventory turns over 4 times a year, sitting on shelves for about 91 days on average. Sell-through rate is 70%, healthy, but an 8% stockout rate suggests some of the store's better sellers are running out faster than they're being replenished.
Included Calculators
Each number above also has its own standalone calculator, in case you only need one.