Days Inventory Outstanding Calculator
Calculate days inventory outstanding with clear inputs, formula guidance, and practical result checks.
Days Inventory Outstanding measurements
Enter your values, then calculate.
Result
How to calculate days inventory outstanding
Days Inventory Outstanding (DIO) measures how many days, on average, inventory sits before being sold — a working capital and inventory efficiency metric.
How the calculation works
DIO = (Average inventory ÷ Annual cost of goods sold) × 365.
Example
$200,000 average inventory against $2,400,000 annual COGS: (200,000÷2,400,000)×365 ≈ 30.4 days.
Frequently asked questions
How is Result calculated?
Result = ([Average inventory] ÷ [Annual cost of goods sold]) × 365.
Is the Days Inventory Outstanding Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Days Inventory Outstanding Calculator
DIO = (Average inventory ÷ Annual cost of goods sold) × 365.
Let's understand your days inventory outstanding result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Days Inventory Outstanding
- A lower DIO generally means inventory turns over faster, which is usually favorable for cash flow, though very low DIO can also indicate stockout risk.
- Compare DIO across similar businesses/industries, since typical inventory turnover varies significantly by sector.
Common Days Inventory Outstanding Mistakes to Avoid
- Comparing DIO across very different industries (like grocery vs. heavy equipment) as if similar turnover rates should be expected.
When to Use This Calculator
Days Inventory Outstanding (DIO) measures how many days, on average, inventory sits before being sold — a working capital and inventory efficiency metric.