Inventory Rotation Calculator for Supply Chain

Do you know how much it really costs you to have inventory standing still? Most companies only see the value of the stock, not the cost of capital, storage and obsolescence it generates. This calculator shows you your actual turnover, the days of inventory and the full hidden cost, with improvement scenarios.

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What does the inventory turnover calculator measure?

Inventory turnover measures how many times a year a company sells and replenishes its entire stock. A company that rotates 10 times is converting its investment into cash 10 times a year. One that rotates 4 times has that capital fixed twice as long, with all the costs that this entails: financing, space, obsolescence, waste.

The number matters because inventory is not a passive asset. Every day that a product is in the warehouse without being sold has a price.

The formula that calculates inventory turnover

The inventory rotation formula has 3 components:

Componente Qué calcula
Rotación = COGS / Inventario promedio Índice de veces que rota el stock en el período
Inventario promedio = (Inv. inicial + Inv. final) / 2 Base del cálculo para normalizar fluctuaciones
DIO = 365 / Rotación Días que cada unidad pasa en bodega antes de venderse

How to read the result of the inventory turnover calculator

  • A high turnover is a good result. You can analyze your operation and see if it has any of these characteristics: a good demand forecast, fulfilled lead times, elimination of products with slow turnover.
  • A low turnover can mean that there is inventory trapped in the warehouse, and an increasing risk of obsolescence. This can be due to poor demand forecasts, products without movement that no one decided to discontinue, or long lead times that force you to order more than necessary to cover them.
  • However, there is one mistake that is often made: assuming that more turnover is always better. Excessively high turnover may indicate that the company is operating with such tight inventories that stockouts are frequent. Every stockout is a lost sale and, in many markets, a customer that never returns. The objective is not to maximize the index but to find the balance between availability and efficiency.

FAQs

What is the inventory turnover ratio?
The turnover ratio measures how many times a year you sell and replenish your inventory. It is calculated as COGS/Average Inventory. A 6x rotation means that you renew your stock 6 times a year.
What are Inventory Days (DIO)?
The days of inventory (Days Inventory Outstanding) indicate how many days it takes on average for each unit to sell. It is calculated as 365/Rotation. A DIO of 60 means that your product spends 2 months in the warehouse.
What is the real cost of maintaining inventory?
The total cost includes: the cost of trapped capital (inventory × interest rate), storage (rent, personnel, insurance) and obsolescence/decline. Many companies only see the value of the stock, not what it costs them to own it.
How do you calculate inventory turnover?
Rotation = COGS/Average Inventory. The average inventory is obtained by adding the initial and ending inventory of the period and dividing by two. If your annual COGS is $8,500,000 and your average inventory is $1,800,000, your turnover is 4.7x.

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