Stock Turnover
A measure of how many times a business sells and replaces its stock within a set period, typically a year. Calculated by dividing cost of goods sold by average inventory value. A higher ratio indicates efficient stock management; a lower ratio points to slow-moving inventory.
Stock turnover - also called inventory turnover or stock turn rate - measures how efficiently a business converts its stock into sales. The calculation is: divide the cost of goods sold (COGS) for a period by the average inventory value held during that period. A business with annual COGS of £400,000 and an average stock holding of £100,000 has a stock turnover ratio of 4.0, meaning it sells and replaces its entire inventory four times a year. Whether 4 is a good or poor result depends entirely on the industry, the product type, and the business model.
Why Stock Turnover Matters
A low stock turnover ratio signals that goods are sitting longer than they should be. For businesses that hold physical inventory - promotional merchandise distributors carrying blank goods, AV integrators stocking spare parts and display equipment, or office furniture dealers holding showroom stock - slow turnover ties up working capital that could fund growth, reduce borrowing, or buffer cash flow.
The costs compound quickly. Stock held for extended periods carries storage, insurance, and handling costs. For merchandise businesses, products with a limited practical life - seasonal items, garments with superseded branding, or display technology that dates quickly - can become difficult or impossible to clear at full margin before they are replaced.
A high stock turnover ratio is not always better. A business turning stock extremely quickly may be running so lean that it regularly stockouts, loses sales, or pays premium prices for rush replenishment. The practical goal is a ratio that keeps stock moving without creating shortfall.
Calculate by product line
Your overall stock turnover may look healthy while a handful of slow-moving lines consume disproportionate warehouse space and working capital. Running the calculation by product category or individual SKU shows where capital is actually stuck and which lines are worth reviewing for pricing, promotion, or discontinuation.
Using Stock Turnover to Guide Purchasing
For businesses buying stock speculatively - whether blank garments for a branded apparel range, AV equipment for a hire fleet, or display furniture for a showroom - stock turnover is a practical benchmark for setting reorder quantities and purchasing intervals.
A product consistently turning faster than average warrants larger reorder quantities and a shorter reorder cycle. A slow-turning product should prompt a review: Is demand genuinely weak? Is the product priced wrong? Is there a more popular substitute? Or is the business simply not selling it actively enough?
Tracking stock turnover alongside sales velocity and supplier lead times creates a more complete picture for purchasing decisions than any single metric alone. It also supports conversations with suppliers about ordering patterns, minimum order quantities, and call-off arrangements - particularly relevant for businesses managing multiple product lines across seasonal demand cycles.
Zigaflow's inventory tools allow businesses to track stock movements against purchases and sales records, making it easier to identify slow-moving lines and act on them before they affect cash flow or margin.
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