How This Calculator Works
This calculator estimates the total quarterly revenue at risk from inventory stockouts across your catalog. It uses three cost components:
1. Direct Lost Revenue
The sales you would have made if the product had been in stock. We estimate daily sales velocity based on your average price point. Higher-priced items typically sell fewer units per day, and the model accounts for that.
2. Amazon Ranking Impact (35% of direct losses)
When an Amazon listing goes out of stock, it loses organic ranking and keyword positioning. When you restock, you don't snap back to where you were. The recovery period can last weeks, and during that time your sales velocity runs below normal. Industry data suggests this costs roughly 35% on top of the direct revenue loss.
3. Emergency Restock Premium (15% of direct losses)
Stockouts force reactive decisions: air freight instead of ocean, rush production runs, expedited last-mile shipping. These premiums typically add 15% to the cost of the goods you lost sales on.
What This Estimate Does Not Include
The calculator is deliberately conservative. It does not account for:
- Lost repeat customers who switch to a competitor
- Wasted advertising spend on out-of-stock listings
- Brand reputation damage from "Currently Unavailable" badges
- Opportunity cost of staff time managing fire drills
Industry Benchmarks
| Metric | Poor | Average | Good | Excellent |
|---|---|---|---|---|
| Overall Stockout Rate | >15% | 5-10% | 2-5% | <2% |
| Avg Days Out of Stock | >14 days | 7-10 days | 3-5 days | <3 days |
| Ranking Recovery Time | >21 days | 10-14 days | 5-7 days | <3 days |
Reducing Your Stockout Cost
The most effective way to reduce stockout costs is to prevent them:
- Demand forecasting that tells you what to reorder before you run out
- Safety stock buffers sized to your actual variability
- Reorder point alerts that fire at the right time, not too early or too late