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Formula, in Operations

Inventory Turnover Formula

The Inventory Turnover formula measures how many times a company sells and replaces its inventory over a specific period, indicating the efficiency of its inventory management and liquidity.

3 variables. Published Mar 12, 2026. Updated Mar 27, 2026. By AI Biz Hub.

Formula
Inventory Turnover = Cost Of Goods Sold / Average Inventory

Variables

IT

Inventory Turnover

The number of times inventory is sold and replaced in the period, as a ratio. Higher means stock moves quickly and capital is not tied up; very high can signal stockout risk.

CGS

Cost Of Goods Sold

Cost of Goods Sold for the period, in currency units. The cost basis of inventory actually sold, used rather than revenue so the ratio is not inflated by markup.

AI

Average Inventory

The average inventory value held over the period, in currency units, typically the mean of opening and closing inventory. The denominator.

Step by step

  1. 1

    Set the baseline case with the real calculator inputs.

    Cost Of Goods Sold = $500,000, Beginning Inventory = 80,000, Ending Inventory = 70,000, Period = Annual

  2. 2

    Use cost of goods sold rather than revenue in the numerator, and average opening and closing inventory for the denominator to smooth seasonality.

    Opening inventory 80,000 and closing 100,000 average to 90,000.

  3. 3

    Apply the formula and read the first calculator outputs, not just the headline assumption.

    The calculator lands with average inventory at 75,000 and a turnover ratio of 6.67 times.

  4. 4

    Re-run as days-on-hand (365 divided by turnover) to translate the ratio into how long stock sits, which is easier to act on.

    A turnover of 6 equals about 61 days of inventory on hand.

Worked example

Inventory Turnover sample case

Cost Of Goods Sold

$500,000

Beginning Inventory

80,000

Ending Inventory

70,000

Period

Annual

Inventory Turnover = Cost Of Goods Sold / Average Inventory using cost of goods sold $500,000, beginning inventory 80,000, ending inventory 70,000, period Annual.

The calculator lands with average inventory at 75,000 and a turnover ratio of 6.67 times.

Common variations

Scenario variants are useful because fixed assumptions rarely survive contact with real life unchanged.
Use Inventory Turnover Calculator to compare the baseline result with one stressed case before relying on a single answer.

Run the numbers next

Sources

  1. Inventory Turnover , Investopedia
  2. Inventory Turnover Ratio , Corporate Finance Institute

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