ABC Analysis Calculator
Classify inventory items into A, B, and C categories by annual consumption value. Use it to prioritize stock management and focus resources on the items that drive the most cost.
About this calculator
ABC analysis ranks inventory items by their annual consumption value, calculated as Annual Value = Annual Usage Quantity × Unit Value. Items are then sorted from highest to lowest value and cumulative percentages are computed. Category A items typically represent ~10–20% of SKUs but ~70–80% of total value, requiring tight control. Category B items cover ~30% of SKUs and ~15–25% of value, needing moderate oversight. Category C items are the remaining ~50% of SKUs but only ~5% of value, managed with simpler, bulk replenishment policies. This Pareto-based approach ensures that procurement effort is proportional to financial impact.
How to use
Suppose you have three items: Item 1 has 500 units × $40 = $20,000 annual value; Item 2 has 2,000 units × $5 = $10,000; Item 3 has 100 units × $8 = $800. Total value = $30,800. Cumulative percentages: Item 1 = 64.9%, Item 2 = 97.4%, Item 3 = 100%. With a Category A threshold of 70% and Category B threshold of 95%, Item 1 falls in A, Item 2 in B, and Item 3 in C. Focus tight inventory controls on Item 1.
Frequently asked questions
What is the difference between ABC analysis A, B, and C categories?
Category A items are your highest-value inventory, typically comprising 70–80% of total annual consumption value despite representing only 10–20% of all SKUs. Category B items are mid-range in value and quantity, while Category C items are low-value but often numerous. The classification tells managers where to invest monitoring effort, safety stock, and procurement attention.
How do you calculate annual consumption value for ABC analysis?
Annual consumption value is simply the Annual Usage Quantity multiplied by the Unit Value: Annual Value = Annual Usage × Unit Value. For example, if you use 1,000 units per year of a part that costs $15 each, its annual consumption value is $15,000. This figure is used to rank all items and compute cumulative percentages across your entire inventory.
When should you update or redo an ABC classification?
ABC classifications should be reviewed at least annually, or whenever there is a significant shift in demand patterns, pricing, or product mix. Seasonal businesses may benefit from quarterly reviews. New product introductions or the phase-out of old SKUs can dramatically change relative rankings, so a static classification quickly becomes misleading and may lead to misallocated safety stock and ordering effort.