Inventory Days Calculator: Formula & Worked Example

Estimate days inventory is held from inventory and annual COGS. Calculate instantly in your browser with editable inputs, a worked example and clear assumptions. No account required.

How it is calculated

Inventory ÷ Annual COGS × 365

Uses a 365-day convention and the supplied inventory balance.

Worked example

Inventory

500000

Annual COGS

2000000

Example result: 91.25 days

The interactive tool lets you edit every input and reset to this example. Calculations run in your browser.

Questions and answers

Are my calculator inputs sent to a server?

These calculations run in your browser. The calculator does not send your entered values to a calculation server or save them to your learning account.

Why can the result differ from a full spreadsheet model?

Each calculator uses the equation and assumptions shown on this page. Displayed values may be rounded. A workbook with different timing, fees, filters or source data can produce a different result.

Can I use the calculator without an account?

Yes. All 73 calculators are available to guest learners. The worked example shows the default inputs, and Reset restores them.

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