ABC Analysis Calculator
Classify your inventory items into A, B, and C categories based on their share of total annual usage value. Use this when prioritizing stock control efforts and identifying which items deserve the most management attention.
About this calculator
ABC analysis is an inventory categorization technique derived from the Pareto principle — roughly 20% of items typically account for 80% of total inventory value. Each item's percentage contribution is calculated as: percentage = (annualUsage / totalInventoryValue) × 100. Items are then sorted descending and grouped: 'A' items are the top ~70–80% of cumulative value (typically ~10–20% of SKUs), 'B' items cover the next ~15–25%, and 'C' items cover the remaining low-value tail. This tiered approach lets supply chain managers allocate tighter controls, safety stock policies, and reorder attention to the items that matter most financially, while relaxing oversight on low-impact stock.
How to use
Suppose your total inventory value is $500,000 and a specific item has an annual usage value of $75,000. Step 1: Divide the item's annual usage by the total: 75,000 / 500,000 = 0.15. Step 2: Multiply by 100 to get the percentage: 0.15 × 100 = 15%. Step 3: Repeat for all items, sort by percentage descending, and accumulate. Items whose cumulative share reaches 70–80% are classified 'A', the next band 'B', and the remainder 'C'. This item at 15% would likely fall in the 'A' category.
Frequently asked questions
What percentage thresholds are used for ABC inventory classification?
The most common thresholds place 'A' items at the top 70–80% of cumulative annual usage value, 'B' items at the next 15–25%, and 'C' items in the remaining 5–10%. These cutoffs are guidelines, not rigid rules — many organizations adjust them based on their specific industry or inventory profile. The key principle is that a small number of SKUs (A items) drive the majority of value and deserve the most rigorous management. Always validate thresholds against your own data distribution.
When should I use ABC analysis in supply chain management?
ABC analysis is most valuable when you need to prioritize inventory control resources across a large number of SKUs. It is commonly used during annual inventory reviews, when setting reorder point policies, or when designing cycle-counting schedules. High-value 'A' items typically warrant monthly or even weekly cycle counts, while 'C' items may only need annual review. It is also useful when renegotiating supplier contracts or determining which products to hold safety stock for.
How is ABC analysis different from XYZ analysis?
ABC analysis ranks items by annual usage value (a financial measure), while XYZ analysis ranks them by demand variability — how predictable or erratic consumption is over time. The two methods are complementary and are often combined into a matrix (e.g., AX, AY, AZ) to give a fuller picture of each SKU. An AX item is both high-value and highly predictable, making it the easiest to manage optimally. A CZ item is low-value and unpredictable, often a candidate for discontinuation or consignment stocking.