Skip to content
Calculator Tools
Inventory Calculators

Days Inventory Outstanding Calculator

Days inventory outstanding (DIO): how many days of sales your current stock covers.

Also known as dio calculator, days of inventory, inventory days on hand.

Enter values

Results update as you type.

Result

Days inventory outstanding

54.8 days

Inventory turns per year
6.67 ×

About the Days Inventory Outstanding Calculator

Days inventory outstanding (DIO): how many days of sales your current stock covers.

Also known as: dio calculator, days of inventory, inventory days on hand.

How to use this calculator

  1. Enter average inventory, annual cogs.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Days Inventory Outstanding formula

DIO = average inventory ÷ COGS × 365

Worked example

Using the values pre-filled in the calculator above:

  • Average inventory = 180,000
  • Annual COGS = 1,200,000

the calculator returns:

  • Days inventory outstanding: 54.8 days
  • Inventory turns per year: 6.67 ×