INVENTORY MANAGEMENT

ABC Inventory Analysis: A Practical Seven-Day Starting Plan

This calculator assumes an 80/20 split to illustrate concentration. It does not classify your stock. Calculate each item's annual usage value to find your actual distribution.

Rank items by annual usage value, then check criticality, demand and lead times before setting stock policies. Seven days is a suggested starting schedule, not a promised result.

Illustrative 80/20 Split Calculator

Explore an assumed split. Calculate the actual concentration from each item's annual usage value; do not treat 80/20 as a rule.

200 SKUs

Assumed share: €160,000 (80%)

800 SKUs

Assumed share: €40,000 (20%)

A full warehouse can still be missing the items you need. ABC analysis helps prioritise attention by annual usage value, but it does not replace a check of critical parts, supplier risk and service requirements. Start with these four stages.

1

ABC Inventory Classifier

Enter your own values, then select Classify. The empty fields do not contain sample data. Adding an item preserves your entries.

Enter annual usage value for each item (annual units used × unit cost). Use the same period and currency for every row.

Boundary rule: after sorting, an item stays in A or B if the cumulative share before it is below 80% or 95%. The crossing item stays in the higher-priority class. Exact value shares vary. Criticality still needs a separate check.

Gather Your Data (Days 1-2)

Export a clean list from your ERP or stock records: annual units used, unit cost and item code (SKU). Use a consistent period, check units and costs, and flag seasonal demand or missing records.

2

Classify Your Inventory (Day 3)

Calculate annual usage value, sort from highest to lowest and review the cumulative share. The 80% and 95% cut-offs below are starting points, not universal rules.

3

Set Different Stock Policies (Day 4)

Use value classes to decide where to focus attention. Check criticality, demand variability, lead times, minimum order quantities and service targets separately. A low-value part can still stop production.

Class A

Review demand and replenishment often. Calculate safety stock from risk and service needs; a high value does not automatically mean a high buffer.

Class B

Use a regular review and a reorder rule that fits demand and lead time. Automate orders only after checking the data and exceptions.

Class C

Keep handling simple, but do not automatically remove stock. Critical spares or long lead times may justify a buffer regardless of value class.

4

Test the Policies (Days 5-7)

Labels alone do not change performance. Test a small set of policies before applying them across the inventory.

  • Day 5: Check proposed reorder points and safety stock with the buyer or planner before updating the ERP.
  • Day 6: Start cycle counts with a small group of high-priority items. Adjust the count frequency to value, criticality and record accuracy.
  • Day 7: Set a baseline for stockouts, service level and inventory value. Review trends over a suitable period, not just one week.

Related Support: Procurement and Inventory

Need help turning the analysis into a working routine? Discuss purchasing, stock records and review rules with e2b. This link is a service, not a promised software kit.

Useful? Share this guide.

LinkedIn Email

Method reference: EazyStock: annual usage value and adjustable ABC thresholds

Summary and Next Steps

Use the seven-day plan to organise a first pass. Data quality and supplier constraints may require more time; measure results before claiming an improvement.

Common Mistakes

  • Using incomplete or outdated demand and cost data.
  • Assigning classes without testing the stock policies.
  • Leaving the analysis unchanged after demand, costs or supplier lead times change.

Measures to Track

  • Stockout rate and service level for high-priority items.
  • Turnover and availability of lower-value items, including critical spares.
  • Inventory value alongside carrying costs and customer service, not as an isolated reduction target.

Illustrative Example

An industrial distributor ranks items by annual usage value, flags critical spares and tests review rules on a small group. It compares stockouts, inventory value and service levels with its baseline before deciding whether the changes helped. No savings or timeline are guaranteed.

Your Action Plan

  • Today: Export usage and cost data and check missing or inconsistent records.
  • First week: Review classes and trial stock policies with the buyer or planner.
  • First month: Count a small group of priority items and review accuracy and service results before expanding.