Amazon Out-of-Stock tracks how often Amazon itself runs out of stock on a product and classifies the pattern as occasional, seasonal, or ongoing. For third-party sellers, Amazon's stock-outs are windows of opportunity to win the buy box.
What It Measures
This metric analyzes Amazon's price availability history to identify periods when Amazon was not selling the product. It counts how many stock-out events occurred, how long they lasted, and whether they follow a predictable pattern.
The analysis combines two data sources: the product's Amazon price history (where gaps indicate stock-outs) and Keepa's own out-of-stock percentages over 30, 90, and 180-day windows.
Why It Matters for Resellers
When Amazon is in stock, they almost always win the buy box. Third-party sellers typically need Amazon to be out of stock to get meaningful sales. Understanding Amazon's stock-out pattern helps you:
- Identify opportunity windows. Products where Amazon regularly drops out give you predictable chances to sell.
- Time your inventory. If stock-outs follow a seasonal pattern, you can have inventory ready before Amazon runs out.
- Assess competition. Chronic Amazon stock-outs attract other third-party sellers — you will not be the only one eyeing the opportunity.
How We Calculate It
- We analyze Amazon's price history for the product, identifying periods where no Amazon price was recorded (indicating out-of-stock).
- We calculate the total out-of-stock time as a percentage of the analyzed period.
- We count individual stock-out events and measure their duration.
- We classify the pattern based on frequency, duration, and regularity of the gaps.
- We cross-check our findings against Keepa's own out-of-stock metrics for accuracy.
When three or more stock-out events are detected, we also analyze the restock cadence — how regularly Amazon restocks after running out.
How to Read the Results
| Classification | What It Means | |---------------|---------------| | No OOS pattern | Amazon has not run out of stock in the analyzed period. The buy box is harder to win when Amazon is always in stock. | | Intermittent | Amazon occasionally runs out. These gaps are your window to win the buy box, but they are not predictable. | | Seasonal | Amazon has stock-outs that follow a regular pattern. You can time your inventory to be ready when Amazon drops out. | | Chronic | Amazon frequently runs out of stock (more than 50% of the time). This is a strong signal for third-party sellers — the buy box is regularly available. |
Seasonal or chronic Amazon stock-outs are opportunities to capture the buy box. Time your inventory to arrive before Amazon typically runs out.
Limitations & Caveats
- Requires at least 4 weeks of Amazon availability data to produce a meaningful classification.
- Past stock-outs do not guarantee future ones. Amazon may improve its supply chain or adjust its inventory strategy.
- "Seasonal" classification requires regular spacing between stock-out events. Irregularly timed events are classified as "intermittent" even if they occur frequently.
- Keepa's native OOS percentages may differ from our analysis. When there is a large discrepancy, we defer to Keepa's metric as it may have access to additional data points.
- Short-lived stock-outs (a few hours) may not appear in the data if they occurred between Keepa's tracking intervals.
Related Metrics
- Demand Stability — Amazon stock-outs can cause temporary demand spikes, affecting stability.
- Seller Concentration — When Amazon drops out, how many other sellers are competing for the buy box?
- Seasonality — Seasonal stock-outs may correlate with broader seasonal demand patterns.