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Inventory Turnover Calculator

Calculate average inventory, inventory turnover and approximate days inventory outstanding.

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Average Inventory —
Inventory Turnover Ratio —
Days Inventory Outstanding —

Calculator guide

Measure how efficiently inventory moves

Average inventory is the midpoint of beginning and ending inventory for the selected period. Inventory turnover divides cost of goods sold by that average.

The calculator estimates days inventory outstanding as 365 divided by turnover. For a period shorter than one year, annualize consistently or adapt the interpretation.

Use cost-based inventory values with cost of goods sold. Do not divide sales revenue by inventory cost unless you intentionally use a different documented metric.

Compare similar products and periods. Very high turnover can indicate efficient demand or insufficient stock; very low turnover can indicate overstock, obsolescence or weak demand.

Formula

Measure how efficiently inventory moves

Average inventory = (Beginning inventory + Ending inventory) ÷ 2; Turnover = Cost of goods sold ÷ Average inventory; Days inventory = 365 ÷ Turnover

  1. Average beginning and ending inventory.
  2. Divide cost of goods sold by average inventory.
  3. Divide 365 by turnover.
  4. Review by product category and season.

Worked example

Worked example

Inputs

Scenario
$120,000 cost of goods sold and average inventory of $25,000 produce 4.8 turns and about 76 days inventory outstanding.

Results

Result
$120,000 cost of goods sold and average inventory of $25,000 produce 4.8 turns and about 76 days inventory outstanding.

Rounded planning example; replace assumptions in the live calculator.

Frequently asked questions

Inventory Turnover Calculator FAQ

What should I verify before using this calculator?

Verify the reporting period, included cost categories, units, currency and source records. Save those assumptions with the result.

How accurate is the result?

The arithmetic follows the displayed formula. Accuracy depends on complete inputs, consistent definitions and values from the same reporting period.

Can I use another currency?

Yes. Keep every monetary input in the same currency. The calculator does not convert exchange rates.

Should I use forecast or actual data?

Use actual data for performance review and documented assumptions for planning. Label forecasts clearly and compare them with actual results later.

Why should I compare several periods?

One period can be distorted by seasonality, promotions, delayed payments or unusual purchases. A consistent trend is more informative.

Is this accounting, tax or professional advice?

No. It is an independent planning tool. Reconcile results with your accounting records and qualified advisers where required.

Are my inputs uploaded?

No. Calculator inputs are processed locally in the browser and do not need to be sent to a server.

Primary sources

Official references and further reading

Editorially reviewed: 2026-07-21

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