Inventory Turnover Ratio: How to Calculate It and What's a Good Number
Inventory turnover ratio measures how many times you sell and replace your stock over a given period. It's one of the most-quoted inventory metrics — and one of the most misread, because a number alone means very little without context.
Most retail businesses aim for a turnover ratio between 4 and 8 times a year — but the "right" number varies enormously by category and business model.
The formula
Inventory Turnover = Cost of Goods Sold / Average Inventory Value. If you sold $200,000 in cost of goods over the year and held an average of $40,000 in inventory, your turnover ratio is 5 — meaning you cycled through your stock five times.
Why a "good" number isn't universal
A grocery chain might turn inventory over 15+ times a year because products are perishable. A furniture retailer might sit closer to 2–3 and still be perfectly healthy, because big-ticket items simply don't move as fast. Comparing your ratio to a generic industry number, instead of your own category and history, is where most misreadings start.
Signs your turnover ratio needs attention
- Turnover has been dropping quarter over quarter with no clear explanation
- Some categories turn over 3x faster than others, but get the same reorder treatment
- You're comparing your ratio to an industry average without adjusting for your own margin profile
- Cash feels tight even though sales look fine on the surface
A high turnover ratio feels good on a dashboard, but if it comes from constant stockouts instead of efficient sell-through, it's not a metric to be proud of.
Turnover too low vs. too high
Low turnover usually means capital sitting idle in slow-moving stock — cash you can't use elsewhere. Turnover that's unusually high, on the other hand, can actually be a red flag for chronic stockouts: you're "selling out" fast because you never had enough to begin with, not because demand is being served well.
Putting it to work
A company-wide average hides which categories are dragging the number down.
High turnover with frequent stockouts is a warning sign, not a win.
Use your own 12-month trend as the target, not a generic industry figure.
Key takeaways
Turnover ratio only means something next to your own category history and your stockout rate. A rising number paired with more stockouts isn't progress — it's a supply gap.
