ABC Analysis in Practice: Prioritizing What Actually Moves Your Business
ABC analysis splits your catalog into three groups by relevance: A items account for most of your revenue (or margin, depending on the criteria you choose), B items carry intermediate relevance, and C items make up the long tail — many products, little individual impact.
In most catalogs, roughly 20% of SKUs drive close to 80% of revenue — yet inventory teams often spend equal time managing all of them.
The most common mistake
Treating every product with the same replenishment and monitoring rules. This creates two problems at once: excess capital tied up in C items that barely sell, and recurring stockouts in A items because no one is watching them as closely as they deserve.
How to classify
The most common approach is to rank products by cumulative revenue (or margin) and split them into tiers: typically A items add up to about 80% of the total, B the next 15%, and C the last 5% — but these proportions can and should be adjusted to fit your own catalog.
A worked example
Say you rank 200 SKUs by revenue, highest to lowest, and add them up as you go. If the top 35 SKUs already account for 80% of total revenue, those are your A items — even though they're just 17.5% of your catalog. The next 45 SKUs might get you to 95% (your B items), leaving the remaining 120 SKUs — over half your catalog — contributing only 5% of revenue.
Signs your catalog needs this
- Reorder frequency is the same for a top seller and a product that sells twice a month
- Nobody can say, without pulling a report, which 20 products matter most
- Warehouse space is allocated by habit, not by which items justify prime shelf space
- Stockouts on best-sellers happen just as often as on slow movers
Spreading equal attention across every SKU isn't fairness — it's a way of under-serving the products that actually carry your business.
How to apply it in operations
Set different inventory policies per tier: higher coverage and tighter monitoring for A items — because a stockout there really hurts — and simpler periodic review for C items, where the cost of close tracking doesn't pay off. B sits in the middle, usually with monthly review instead of weekly.
Turning tiers into action
These deserve the tightest monitoring — a stockout here is the most expensive kind.
Enough attention to catch problems early, without the overhead of weekly tracking.
Simple reorder rules are enough here — manual attention rarely pays for itself.
The real payoff
It's not just about saving analysis time — it's about putting your team's attention exactly where the financial impact is greatest, instead of spreading effort equally across products that carry completely different weight in the business's results.
Key takeaways
A items are usually a small slice of your catalog driving most of the revenue — give them weekly attention. C items make up the bulk of SKUs but barely move the needle — automate or check them quarterly instead.