Ending Inventory Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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Ending Inventory Calculator turns a set of practical inputs into one focused estimate. On this page, it estimates ending inventory from beginning inventory, purchases, and cost of goods sold, which makes the tool best suited to scenario checking rather than prediction.

What this calculator does

Ending Inventory Calculator estimates ending inventory from beginning inventory, purchases, and cost of goods sold. The visible form contains Beginning inventory, Purchases, Cost of goods sold. These are the inputs that define this calculator’s scope. If a value, rule, or adjustment is not represented by a working field, it should not be assumed to be included in the result.

How to use it

Enter Beginning inventory, Purchases and Cost of goods sold. Keep monetary inputs in the same currency, or use the currency selector when one is provided. Before calculating, recheck Beginning inventory and the other values that materially affect the result. For a clean comparison, hold the other inputs constant while changing one assumption at a time so you can see what is driving the result.

How the calculation works

Intended ending inventory = beginning inventory + purchases − cost of goods sold. This is the calculation method that should anchor any manual check of the output. If a displayed field does not affect the current calculation, that limitation is stated below rather than silently treating the field as part of the formula.

Example

With beginning inventory of 50,000, purchases of 120,000, and cost of goods sold of 100,000, ending inventory is 70,000.

How to interpret the result

The equation is an inventory roll-forward: goods available for sale are beginning inventory plus purchases, and what remains after COGS is ending inventory. Compare results produced from the same definitions and time period. A mathematically larger or smaller number is not automatically better unless the financial context makes that direction meaningful.

Limitations and notes

The displayed fields are now wired to the calculation used on this page. Results remain simplified estimates and should be checked against the definitions, units, accounting conventions, and source data relevant to the real decision.