Where do calculations run?

This tool runs in your browser for quick estimates. Use consistent units and verify critical figures independently.

Vendora

Small business calculator

Inventory Turnover Calculator

Estimate how fast inventory moves: enter cost of goods sold for the period, beginning and ending inventory, and how many days that period covers. You get average inventory, turnover times per period, and approximate days of inventory.

Inputs

Average inventory = (beginning inventory + ending inventory) ÷ 2. Turnover = COGS ÷ average inventory. Use COGS and inventory valued the same way.

Cost of goods sold COGS for the same period as the inventory snapshots.

Beginning inventory Inventory at period start.

Ending inventory Inventory at period end.

Period Days in the period (e.g. 365 for a year, 90 for a quarter).

Average inventory Calculated after you click Calculate.

Inventory turnover Calculated after you click Calculate.

Inventory days Approximate days of inventory on hand.

Results

Days of inventory ≈ period days ÷ turnover (times inventory turns in the period).

Inventory turnover —

Average inventory —

Inventory days —

Example

COGS is $450,000, beginning inventory is $10,000, ending inventory is $15,000, and the period is 365 days. Average inventory is $12,500. Turnover is $450,000 ÷ $12,500 = 36 times per year. Days of inventory ≈ 365 ÷ 36 ≈ 10.1 days.

How it works

Average inventory = (beginning inventory + ending inventory) ÷ 2. Inventory turnover = COGS ÷ average inventory (requires average inventory > 0). Days of inventory ≈ period length in days ÷ turnover. Definitions vary by industry; use consistent COGS and inventory valuation.