Inventory Turnover Calculator

Calculate inventory turnover ratio and days to sell. Measure how efficiently your business manages inventory.

Inventory turnover measures how many times a business sells and replaces its entire inventory over a period, calculated as Cost of Goods Sold divided by Average Inventory. A turnover ratio of 10 means the business cycled through the equivalent of its average inventory value ten times during the period -- a useful proxy for how efficiently capital tied up in stock is being converted back into sales. Days to Sell restates the same relationship on a calendar timescale: 365 divided by the turnover ratio, giving the average number of days a unit of inventory sits before it sells. The two figures move in opposite directions from the same inputs -- a business that raises its turnover ratio necessarily lowers its days to sell, and vice versa, since one is mathematically the inverse of the other scaled by 365. What counts as a "good" turnover ratio varies enormously by industry: a grocery store selling perishables might turn inventory over 15+ times a year, while a furniture retailer or heavy equipment dealer might turn over just 2-4 times and still be considered healthy, because their inventory carries a fundamentally different holding cost and shelf life. This calculator only measures the ratio itself; it does not evaluate whether a given ratio is appropriate for your industry, nor does it account for seasonal inventory swings that a single average-inventory figure can mask.

Inputs

Cost of Goods Sold

Average Inventory

Tab to move between fields

Results

Turnover Ratio

Days to Sell36.5

How to Use This Calculator

Enter cost of goods sold and average inventory value for the period.
Review Turnover Ratio and Days to Sell (inventory days outstanding).
A higher ratio means faster-moving inventory; a lower ratio suggests overstocking or slow sales.

How the result changes with Average Inventory

Average Inventory	Turnover Ratio
$10,000,000.00	0.05
$35,000,000.00	0.01
$65,000,000.00	0.01
$90,000,000.00	0.01

What each input means

Cost of Goods Sold: Total cost of goods sold during the period.
Average Inventory: Average inventory value during the period.

What each result means

Days to Sell: Average number of days to sell inventory.

How this is calculated

Worked example, using the default values

Identify Input Parameters
Cost of Goods Sold = 500000, Average Inventory = 50000 = 2 input(s) provided
Calculate Turnover Ratio
Turnover Ratio
10 = 10
Calculate Days to Sell
Days to Sell
36.5 = 36.5

Engine last updated August 16, 2026. Checked against 1 independently-derived test — how we verify calculators.

Frequently Asked Questions

What does a turnover ratio of 10 actually mean?

It means the cost of goods sold during the period was ten times the average inventory value carried on hand -- effectively, the business sold through the equivalent of its entire average stock ten separate times. It does not mean any single physical item sold exactly ten times; it's an aggregate measure of how quickly capital tied up in inventory converts back into revenue across the whole product mix.

Why do days to sell and turnover ratio move in opposite directions?

Days to Sell is calculated as 365 divided by the turnover ratio, so the two are mathematical inverses of each other. Raising cost of goods sold (selling faster or more) pushes turnover ratio up and days to sell down at the same time; raising average inventory (carrying more stock relative to sales) does the opposite -- lowering turnover ratio and raising days to sell, since more capital is sitting still relative to what moves through it.

Is a higher turnover ratio always better?

Not necessarily. A very high ratio can signal understocking -- selling out frequently and potentially losing sales to stockouts -- rather than pure efficiency. Conversely, a low ratio typically does indicate overstocking or slow-moving inventory tying up cash that could be used elsewhere, but the "right" number depends heavily on the industry and the specific products involved, so this ratio is best compared against your own historical trend or direct competitors rather than a universal target.

How much does doubling average inventory change days to sell?

Because days to sell is proportional to average inventory (365 x Average Inventory / Cost of Goods Sold), doubling average inventory while holding cost of goods sold fixed exactly doubles days to sell -- at this calculator's defaults, doubling average inventory from $50,000 to $100,000 moves days to sell from 36.5 to 73 days, since the relationship is directly linear, not diminishing.

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