Inventory Turnover

What is Inventory Turnover?

Inventory turnover is COGS divided by average inventory—how many times you sold through and replaced stock in the period. A distributor with EUR 1.2M COGS and EUR 200,000 average inventory turns six times a year, roughly every two months. I track it by category because a blended number hides slow movers sitting next to A-class lines that turn twelve times. Higher turnover frees cash and cuts obsolescence risk, but only if fill rate on critical SKUs holds—chasing turnover by starving stock loses customers faster than finance sees the savings.

Why Inventory Turnover matters

Inventory is often the biggest balance-sheet line after receivables. Turnover falling from 6.8 to 6.0 on EUR 200,000 average stock means more euros sitting idle—warehouse rent, insurance, and write-downs follow. Ignore it and you fund excess MOQ purchases while the overdraft tightens for payroll. Customers feel it when A-class stockouts rise because someone cut orders to 'improve turnover.' Production feels it when raw material piles up because finished goods are not moving. Turnover connects planning bias to cash—when it drops, ask whether demand softened, purchasing overshot, or WIP stacked because sales missed plan.

Formula and variables

Real business example

Panonska Supply d.o.o., a EUR 4M regional industrial distributor in Novi Sad, records annual COGS EUR 1.2M. Average inventory EUR 200,000 → turnover 6.0. Prior year was 6.8. Investigation finds EUR 45,000 excess on two slow-moving families ordered under blanket MOQs. They cut next orders, run a targeted promotion on slow lines, and target turnover 6.5 while keeping A-class fill rate above 97%.

How to interpret the result

Turnover measures speed—whether faster is better depends on service level.

• High turnover with rising stockouts means you cut too deep on critical SKUs.
• Segment by ABC; fix A-class turnover before optimising C-class.
• Year-end write-offs inflate turnover without fixing buying behaviour.
• Use COGS in the numerator, not revenue, when margins differ by line.

Benchmark context

Grocery turns faster than heavy machinery—compare to your prior year, supplier lead times, and peers in your trade association. A target of '10 turns' is meaningless without fill-rate context. Improvement is rising turnover with stable or improving A-class service and falling obsolete percentage—not the highest number on a generic table.

Red flags

• Turnover down 0.5+ turns year-on-year with flat COGS—EUR 30k–50k extra cash likely trapped at EUR 200k average inventory scale.
• Turnover up but A-class stockout rate above 3%—you traded customer service for a metric.
• Turnover spike after a write-off—operational performance unchanged, balance sheet cleaned cosmetically.
• Finished-goods turnover falling while raw-material turnover rises—production building WIP or FG sales missing plan.
• C-class MOQ orders driving turnover down—procurement habit, not market demand.

Common mistakes

• Using end-of-month inventory only instead of a proper average.
• Mixing revenue-based and COGS-based turnover formulas.
• Optimising finished goods while raw material turnover deteriorates.
• Writing off obsolete stock once a year to boost turnover cosmetically.
• One turnover target for all ABC classes regardless of lead time.

What should management do next?

Related calculators

Related analyzers

Related templates & software

Related KPI pages

Related blog articles

Summary

Inventory turnover shows how efficiently stock moves through sales. Track it by category with service metrics, and fix forecast, MOQ, and slow movers—not blanket cuts.

Reviewed by ZBI Business Control Library · Last updated 2026-06-15