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Free inventory turnover calculator
Turns per year and days of inventory from COGS and average stock.
The formula Turnover = COGS ÷ average inventory. DOI = days ÷ turnover.
Days of inventory .
Worked example £300k COGS / £50k avg stock → 6.0 turns, DOI ≈ 61 days.
Common questions Units or value? This tool uses value. Ops DOI can use units.
Good turnover? Category-specific.
Average inventory? (Begin+end)/2 for same period as COGS.
Vs days of cover? Related; cover often uses units + forward sales.
Is this calculator free? Yes. Free in your browser with no account required.
Is there a free trial of OmniRestock? Yes. 14-day free trial, every feature, no card required.
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