Inventory turnover:
how fast your stock sells through, and what it costs to hold

How many times your stock sells through in a year

Inventory turnover counts the number of times a business sells and replaces its average stock during a period, usually a year. A grocer with high turnover restocks constantly and holds little at any moment. A jeweller or machine-tool dealer turns stock slowly and must tolerate it.

The ratio matters because inventory is cash in physical form. Money sitting on shelves cannot pay suppliers, salaries or loans, and the goods may spoil, go out of fashion or need insurance and storage space. Higher turnover generally means money returns faster, though turning too fast can also signal that you are running out of stock and losing sales.

The formulas

Cost of goods sold is used rather than sales because inventory is carried at cost. Using sales inflates the ratio by the gross margin. If only sales figures are available, the answer is a rough upper bound, not a like-for-like figure with peers.

Worked example: ₹12,00,000 of COGS

To read the result, compare 76 days with the supplier's credit period. If you pay suppliers in 30 days and wait 76 days to sell the goods, you are financing 46 days of stock out of your own pocket, plus the time the customer takes to pay. That gap is the reason a profitable business can still run short of cash.

Suppose the owner improves purchasing and holds ₹2,00,000 on average instead. Turnover rises to 6.0 and days of stock fall to about 61. The same sales are served with ₹50,000 less cash tied up, a release that could be used to repay a loan or buy faster-moving lines.

The closing figure of ₹3,00,000 in the example is higher than the opening one, which is worth a question. Stock built up through the year, possibly ahead of a season or because sales slowed. Averaging only two points can miss a mid-year peak, so many firms use monthly balances where they are available.

What counts as good turnover

There is no universal benchmark. Perishable food retailers may turn stock dozens of times a year, apparel several times, and heavy equipment suppliers only once or twice. The useful comparisons are your own trend over time and peers in the same trade with a similar business model.

What slow stock costs, and the profit view

Holding inventory has a price: the cost of the capital tied up, storage space, insurance, handling, shrinkage and obsolescence. Businesses often estimate it at a percentage of stock value a year, and the figure varies widely by product and by borrowing cost. At an assumed 20% a year, ₹2,50,000 of average stock costs ₹50,000 a year to carry, and trimming the average to ₹2,00,000 saves about ₹10,000 a year before any other benefit.

Turnover tells you about speed; it does not tell you about profit. Gross margin return on inventory combines the two: gross profit divided by average inventory at cost. With sales of ₹18,00,000 and COGS of ₹12,00,000, gross profit is ₹6,00,000, and on average stock of ₹2,50,000 that is a return of 2.4 rupees per rupee of stock. A product that turns slowly but carries a high margin can score well on this measure.

Ways to raise turnover without hurting sales

• Review the range: a small number of products often produce most sales, and the long tail of slow lines can be trimmed or ordered only against demand.
• Order more often in smaller quantities when supplier terms and transport costs allow.
• Use sales history to set reorder points rather than rules of thumb.
• Clear aged stock early with promotions, because carrying it costs money every month it stays.
• Negotiate supplier lead times so you hold less buffer.

Another practical step is to separate slow stock into 'slow but needed' and 'dead'. A spare part that sells twice a year but protects a customer relationship earns its shelf space. Items unsold for a full year with no prospect are different, and holding them hides the real picture of working capital while their value may need writing down.

Where the ratio can mislead

Seasonal businesses show different turnover depending on the date of the balance sheet. A shop that stocks up before a festival will look sluggish if closing stock is measured just before the peak. Changing from FIFO to another costing method alters inventory values and the ratio with no change in real movement. Growing firms may deliberately build stock, so a falling ratio is not always a problem.

There is also a data-quality point. Stock records can drift from physical counts because of theft, damage and mis-keyed receipts, and an overstated closing balance understates turnover. A periodic count that reconciles the book figure to the shelf is the cheapest way to make the ratio trustworthy.

A calculator helps compare different year-end values and see how days of stock would change under a target. Always pair the figure with gross margin: a slow-turning product with a high margin can earn more than a fast mover with a thin one.