What it actually tells you
It estimates how frequently the recorded inventory investment is consumed and replenished. It does not count each physical item’s movement.
THE CALCULATION
Formula
Inventory turnover = cost of goods sold ÷ average inventory; inventory days = average inventory ÷ cost of goods sold × days in period
A simple example
Educational example: ₹600 crore annual cost of goods sold and ₹100 crore average inventory give 6× turnover and about 60.8 inventory days using 365 days.
All figures in this guide are illustrative teaching examples.
Read both sides of the number.
What high can mean
High turnover may indicate efficient replenishment or insufficient stock that causes missed sales. Product mix affects the reading.
What low can mean
Low turnover may reflect slow demand, obsolete stock, seasonal preparation or strategic safety inventory.
When a high reading may be justified
Reliable suppliers and short replenishment times can support fast turnover. Check service levels and supply-chain resilience.
When a low valuation may be dangerous
A low valuation can overstate asset backing if slow inventory must be sold below carrying value or written off.
BEYOND THE TEXTBOOK
Professional interpretation
Analyse raw materials, work in progress and finished goods separately where disclosed. Review provisions, stock-outs and order demand, then connect inventory movements to operating cash flow.
Compare in context.
Live comparison data is not connected. No company or market averages are supplied here.
Sector context
Fresh food turns much faster than aircraft components. Compare businesses with similar product shelf lives and production cycles.
Industry context
Seasonality, supplier lead times and import dependence affect sensible buffers. Inventory reductions can improve cash temporarily while increasing disruption risk.
Historical comparison
Use monthly or quarterly averages where available. Two balance-sheet dates can miss a large seasonal stock build-up.
Peer comparison
Match costing policies, write-down treatment and period length. Use cost of sales rather than revenue to match inventory’s cost basis.
Limitations
Reported values are influenced by inflation and provisions. A write-down can raise turnover by reducing the denominator without improving physical movement.
Common investor mistakes
Using revenue and calling it standard inventory turnover; assuming faster is always better; ignoring inventory provisions.
Example interpretation
Six turns, or about 61 days, needs a product-specific benchmark. Ask whether that stock level meets demand without building obsolete inventory.
Questions worth asking
Why use cost of goods sold?
Inventory is recorded on a cost basis, so cost of goods sold gives a more consistent comparison than selling-price revenue.
Are high inventory days always a problem?
No. Long production cycles and strategic reserves can justify them, but funding and obsolescence still matter.
Analyse these together
A single ratio cannot capture the business. Combine it with:
Further reading
TROUGH editorial explanations and educational examples. Sources provide reference material; they do not supply live company figures.
FROM UNDERSTANDING TO RESEARCH
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