Calculator Input
Use the responsive grid below. It shows three columns on large screens, two on medium screens, and one on mobile devices.
Example Data Table
| Scenario | COGS | Beginning Inventory | Ending Inventory | Average Inventory | Turnover Ratio | Days in Inventory |
|---|---|---|---|---|---|---|
| Retail basics | 120,000 | 18,000 | 22,000 | 20,000 | 6.00 | 60.83 |
| Seasonal wholesaler | 480,000 | 70,000 | 50,000 | 60,000 | 8.00 | 45.63 |
| Slow-moving line | 90,000 | 40,000 | 50,000 | 45,000 | 2.00 | 182.50 |
Formula Used
(Beginning Inventory + Ending Inventory) ÷ 2
Cost of Goods Sold ÷ Average Inventory
Period Days ÷ Inventory Turnover Ratio
Net Sales ÷ Average Inventory
Gross Profit ÷ Average Inventory
The core ratio measures how many times inventory is sold and replaced during a period. A higher value usually signals faster stock movement, while a lower value can indicate overstocking, weak demand, or excess carrying cost.
How to Use This Calculator
- Enter cost of goods sold for the chosen accounting period.
- Provide beginning and ending inventory values in the same currency.
- Add optional net sales and gross profit for deeper efficiency analysis.
- Keep the average method on auto or enter a weighted manual average.
- Enter period days, usually 365, 360, 90, 30, or 7.
- Optionally enter a benchmark ratio for target comparison.
- Click calculate to show results above the form.
- Use the CSV or PDF buttons to export your output.
Frequently Asked Questions
1. What does inventory turnover ratio measure?
It measures how efficiently inventory is sold and replenished during a period. The ratio compares cost of goods sold against average inventory to reveal stock movement speed.
2. Is a higher turnover ratio always better?
Not always. Very high turnover can indicate strong efficiency, but it can also signal stockouts, missed sales, weak safety stock, or purchasing pressure.
3. Why is average inventory used instead of ending inventory?
Average inventory smooths period changes. It reduces distortion when beginning and ending stock levels differ meaningfully, giving a more balanced efficiency measure.
4. When should I use manual average inventory?
Use manual average inventory when stock levels fluctuate heavily within the period. A weighted average from monthly or weekly balances often reflects reality better.
5. What is days in inventory?
Days in inventory estimates how long stock remains on hand before being sold. Lower values often indicate faster movement and lower holding time.
6. Can I compare this ratio across industries?
Cross-industry comparison should be cautious. Grocery, fashion, automotive, and industrial businesses operate with very different margins, lead times, and inventory patterns.
7. What is GMROI in this calculator?
GMROI stands for gross margin return on inventory investment. It shows how much gross profit is earned for each inventory unit invested.
8. Should I use net sales or cost of goods sold?
Use cost of goods sold for the main turnover formula. Net sales is optional here and supports a secondary sales-to-inventory efficiency view.