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Metrics

Inventory Hero articles on metrics — practical guidance for Amazon FBA sellers.

  • June 20, 2026·5 min read

    Amazon FBA Inventory Statistics That Actually Matter

    The FBA inventory statistics that move your business are your own: turnover, sell-through, IPI, stockouts, returns. What each tells you and how to read it.

  • June 10, 2026·5 min read

    Inventory Turnover Benchmarks by Industry, Explained

    Inventory turnover benchmarks vary widely by category. Rough ranges by product type, why they differ, and how to set your own target as an FBA seller.

  • June 8, 2026·5 min read

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Inventory Metrics: Leading vs Lagging Indicators

Not all inventory metrics are equal. Which ones warn you before a stockout (leading) and which grade you after (lagging), for FBA sellers.

  • May 16, 2026·5 min read

    Product Segmentation: Managing Your Catalog by Tiers

    Product segmentation groups your SKUs so you can manage them differently. ABC and XYZ analysis, margin and lifecycle cuts, and why it matters.

  • April 27, 2026·5 min read

    Amazon Return Rate: How to Measure and Reduce It

    Your Amazon return rate is returns divided by orders. How to find it, what is normal by category, and the levers that actually bring it down.

  • March 24, 2026·5 min read

    Inventory-to-Sales Ratio: Formula and How to Read It

    The inventory-to-sales ratio is inventory value divided by sales: a fast read on whether you carry too much stock. Formula, example, and FBA context.

  • March 23, 2026·5 min read

    Inventory Accuracy: How to Measure and Improve It

    Inventory accuracy is the share of your records that match reality. The formula, benchmarks, what breaks it, and how to improve it on Amazon FBA.

  • March 22, 2026·10 min read

    The Inventory KPIs That Matter Most for Amazon FBA

    The inventory KPIs FBA sellers should track: sell-through, turnover, days of supply, GMROI, and DSI, with the formula and benchmark for each.

  • February 27, 2026·5 min read

    Stockout Days: What They Are and Why They Matter on FBA

    Stockout days are the days a SKU was unavailable. Why they quietly distort your velocity and IPI, how to find them, and how to exclude them from your math.

  • February 23, 2026·5 min read

    How to Calculate Lost Sales from an Amazon Stockout

    Lost sales equal your stockout days times the velocity you would have had. The formula, a worked example, and how to adjust for trend and season.

  • February 1, 2026·6 min read

    Days of Supply vs Days of Inventory on Amazon FBA

    Days of supply vs days of inventory: what each measures, how to calculate them, and which one tells an Amazon FBA seller when to reorder.

  • January 22, 2026·5 min read

    Days Inventory Outstanding (DIO): Formula and Meaning

    Days inventory outstanding measures how many days it takes to sell your stock, at cost. The formula, a worked example, and how DIO drives your cash cycle.

  • December 20, 2025·5 min read

    Inventory Turnover Ratio: Formula, Example, Benchmarks

    The inventory turnover ratio is COGS divided by average inventory value. The formula, a worked example, and what good looks like for FBA.

  • December 17, 2025·5 min read

    Weeks of Supply Formula: How Long Your Stock Lasts

    The weeks of supply formula is inventory on hand divided by average weekly sales. How to calculate it, read it, and use it to time reorders.

  • December 13, 2025·5 min read

    Days Sales in Inventory (DSI): Formula and Meaning

    Days sales in inventory (DSI) is how many days your stock sits before it sells. The formula, a worked example, and how it relates to turnover for FBA.

  • December 12, 2025·5 min read

    GMROI Explained: Gross Margin Return on Investment

    GMROI is gross margin divided by average inventory cost: the margin each inventory dollar returns. The formula, an example, and why it beats turnover.

  • December 9, 2025·5 min read

    Sell-Through Rate: The Formula and Why It Drives IPI

    Sell-through rate is units sold divided by average units on hand. The formula, a worked example, and why it drives your Amazon IPI and restock timing.

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