Stockturn Calculator – Calculate Inventory Turnover Ratio for Retail & Ecommerce

A good stockturn rate depends heavily on your category. For womenswear, a rate of 4–6 times per year is considered healthy, while accessories can achieve 6–8 times due to lower unit costs and higher purchase frequency.

However, outerwear and premium footwear typically turn only 2–3 times per year because of their seasonal nature and higher unit values. Therefore, always benchmark your stockturn against your specific category rather than a generic industry average.

The retail method calculates stockturn using the cost value of your inventory and cost of sales. It is the standard approach used by most fashion buyers and merchandisers because it accounts for the value of stock held, not just the quantity.

The unit method, on the other hand, uses the number of units sold divided by the average units held. It is simpler and useful for analysing a single style or SKU. However, it can be misleading across a mixed range where unit prices vary significantly.

There are two levers available to you: increase sales or reduce the amount of stock you are holding. Run the stock turnover calculator on each category separately to identify which styles or departments are dragging your overall average down.

From there, you can markdown slow-movers to clear inventory faster, reduce your forward order depth on underperforming lines, and tighten your open-to-buy to avoid over-stocking in the next season. Furthermore, improving your sell-through forecasting at the buying stage will reduce excess inventory before it becomes a problem.

Yes. An extremely high stockturn can indicate that you are under-buying and consistently running out of stock. As a result, you may be losing sales because popular styles are selling out too quickly and customers cannot find their size or colour.

The goal is therefore not to maximise stockturn at all costs, but to find the optimal rate for your category — one that balances sell-through performance with availability for the customer.

Open-to-buy (OTB) is the amount of new stock you are permitted to purchase in a given period. Your stock turnover calculator result is one of the key inputs that determines your OTB budget. When inventory is moving quickly, your existing stock sells faster and in turn creates more room to bring in fresh product.

Conversely, if your stockturn is low, your OTB will be restricted because you already have too much stock on hand relative to your rate of sale. Therefore, monitoring stockturn weekly is essential for keeping your OTB planning accurate and your buying in control.

Weeks cover tells you how many weeks your current stock will last at the current rate of sale. For example, a weeks cover of 10 means you have approximately 10 weeks of trading stock available before you run out.

It matters because it gives you a practical, time-based view of your inventory. Most fashion retailers aim to carry between 6 and 10 weeks of cover depending on category, though this varies by channel and season. Anything above 12 weeks suggests overstocking and will likely require a markdown intervention to clear.