Skip to content
ENExplore Calculators

ABC Inventory Classification Calculator

Work out abc inventory classification instantly with clear inputs, formula shown and shareable results.

About ABC Inventory Classification Calculator

ABC classification applies Pareto logic to inventory: rank items by annual usage value, then cut the ranked list at roughly 80% and 95% of cumulative value. Class A items justify tight forecasting and cycle counting; class C items should be managed with minimum effort.

Formulas

Annual usage value

Usage value = Annual usage units x Unit cost

Classification

Cumulative value <= 80% = A; <= 95% = B; above = C

Worked example

With the default values below, ABC Inventory Classification Calculator returns ABC class of A — tight control, frequent review. Change any input above and every figure here is recalculated in your browser.

Inputs used

Annual usage (units)
4,800
Unit cost
12.5
Total annual value of all items
2,400,000
Cumulative value share of higher-ranked items
62

Results

ABC class
A — tight control, frequent review
Annual usage value
$60,000.00
Share of total portfolio value
2.500%
Cumulative share including this item
64.50%

Step by step

  1. 1Values used
  2. 2Annual usage value
  3. 3Classification
  4. 4ABC class= A — tight control, frequent review
  5. 5Annual usage value= 60,000.00
  6. 6Share of total portfolio value= 2.500
  7. 7Cumulative share including this item= 64.50

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation or tax into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why value rather than volume?

Because control effort should follow the money. A cheap high-volume fastener rarely deserves the attention a low-volume critical assembly does.

Are the 80/95 cut-offs fixed?

No, they are conventions. Some operations use 70/90 or add a D class for obsolete stock; keep the boundaries stable so trends stay comparable.

Related Calculators

ABC Inventory Classification Calculator | Calcrivo