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Inventory Turnover Calculator

Measure inventory turns and implied inventory days for the exact reporting period you enter.

Your numbers

Make it your own
Updates as you type
Inventory turnover in the entered period
5×

Calculated from your inputs · rounded for display

Average inventory$24,000.00
Inventory days73days

Uses a simple two-point average at cost. Seasonal businesses may need a monthly average. Turnover is for your period and is not automatically annualized.

Your calculation, step by step

No black boxes
  1. Average inventory = (20000 + 28000) / 2.
  2. Turnover = 120000 / average inventory; days = 365 / turnover.

What if things were different?

Save up to three scenarios, then change your inputs to compare the possibilities.

How to use this calculator

  1. Enter your own values in the labeled fields. Check the units and assumptions before comparing results. Only the fields needed for your selected calculation mode are shown.
  2. Your answer updates automatically. Review the calculation steps to see exactly how it was calculated.
  3. Copy, share, save, or download your result. Saved inputs stay on this device.

How the calculation works

Turnover = COGS / [(beginning+ending inventory)/2]; days = period days / turnover

The tool uses the average of beginning and ending inventory at cost. It reports turns for your actual reporting period, not an automatic annual rate. If COGS is zero, inventory days are undefined rather than zero. Review the units, period and assumptions before comparing scenarios. Displayed values are rounded, while the underlying calculation retains its available precision.

A worked example

$120,000 COGS divided by average inventory of $24,000 gives 5 turns. For a 365-day period, inventory days are 73.

Reading your result

Use the main result together with its units and supporting figures. Display values are rounded; calculations keep their underlying precision. A change in inputs or assumptions can change the answer. Compare the step-by-step working with your intended use before relying on an estimate.

Frequently asked questions

What assumptions does this calculation use?

The tool uses the average of beginning and ending inventory at cost. It reports turns for your actual reporting period, not an automatic annual rate. If COGS is zero, inventory days are undefined rather than zero.

Can I save or check a scenario?

The result includes the working and supporting values. Save and Restore keep inputs on this device; Copy, Download and Print export the result. Sharing a scenario explicitly includes the inputs in its link.

Sources & methodology

SEC: financial statements and ratios ↗

Formula review: October 24, 2026. Read our methodology.