Calculating your days inventory outstanding is straightforward once you know the Days Inventory Outstanding (DIO) formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the Days Inventory Outstanding (DIO) Calculator.
What is Days Inventory Outstanding (DIO)?
The Days Inventory Outstanding (DIO) calculation tells you your days inventory outstanding from a few simple inputs. The figure you are solving for here is the days inventory outstanding.
The Days Inventory Outstanding (DIO) formula
The core formula is:
Days inventory outstanding = Average inventory ÷ Cost of goods sold × Days in periodHere is what each input means:
- Average inventory — a money amount. Example: ₹30,000.
- Cost of goods sold — a money amount. Example: ₹2,19,000.
- Days in period — a number. Example: 365.
How to calculate it step by step
- Write down the average inventory (for example, ₹30,000).
- Write down the cost of goods sold (for example, ₹2,19,000).
- Write down the days in period (for example, 365).
- Apply the formula above to get your days inventory outstanding.
- Double-check the result with the Days Inventory Outstanding (DIO) Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Average inventory | ₹30,000 |
| Cost of goods sold | ₹2,19,000 |
| Days in period | 365 |
| Days inventory outstanding | 50.0 |
With average inventory of ₹30,000, cost of goods sold of ₹2,19,000 and days in period of 365, the days inventory outstanding works out to 50.0.
Example 2
With average inventory of ₹60,000, cost of goods sold of ₹2,19,000 and days in period of 365, the days inventory outstanding works out to 100.0.
| Result | Value |
|---|---|
| Days inventory outstanding | 100.0 |
Example 3
With average inventory of ₹15,000, cost of goods sold of ₹2,19,000 and days in period of 365, the days inventory outstanding works out to 25.0.
| Result | Value |
|---|---|
| Days inventory outstanding | 25.0 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the Days Inventory Outstanding (DIO) Calculator does it instantly, for free, with the formula and a worked example built in.
Related calculators
Continue exploring business calculators with these tools: Discount Calculator, Price Elasticity of Demand Calculator, Profit Margin Calculator, Gross Profit Calculator, ROI Calculator.