Not every item in a warehouse needs the same amount of attention. A handful of products usually drive most of a business's inventory value. A much larger number of items add very little. ABC analysis turns that fact into a simple system. It aims effort where it counts.

The Three Categories

Category A items are a small group, often around 20% of items. They make up most of the inventory value, roughly 70-80%. These items need the tightest tracking. Count them most often. Watch their reorder timing closely.

Category B items sit in the middle. A moderate share of items add a moderate share of value. They need regular checks, but not as much as Category A.

Category C items make up the largest number of SKUs. But they hold the smallest share of value, often just 5-10%. Businesses can manage these with simpler, less frequent checks, without much risk.

How to Run an ABC Analysis

The process is simple:

  • Calculate each item's annual usage value (units used per year × cost per unit).
  • Rank all items from highest to lowest usage value.
  • Group the top items, roughly 70-80% of total value, as A. Call the next tier B, and the rest C.

Why This Matters

Treating every item the same wastes effort. Counting a low-value item every week often wastes time. But counting a high-value item just once a year leaves room for costly errors to slip by. ABC analysis puts limited time where mistakes cost the most.

Applying ABC Beyond Counting

Once items are sorted into groups, those groups can guide how often to reorder and how much safety stock to hold. They can even decide which items get closer forecasting. A Category A item might get an exact reorder point, set by a formula. A Category C item might just get reordered on a fixed schedule.

Key Takeaways

ABC analysis groups inventory into three tiers by value. This lets a business focus its tightest controls on the few items that drive most of its value. It's a simple way to put limited attention where it counts most.

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