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Weighted Average Unit Cost Calculator

Combine beginning stock and one purchase into a weighted average inventory unit cost.

Use a consistent reporting periodCheck the calculation below
Business dashboard
Business dashboard

Use figures from the same reporting period.

See the method

Enter your business figures

Runs on your device

Your key metric

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter beginning units, beginning unit cost, purchased units, purchase unit cost.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Weighted unit cost = (beginning units×cost + purchased units×cost) / total units.

A WORKED EXAMPLE

Using beginning units = 100 units, beginning unit cost = 10 currency/unit, purchased units = 50 units, purchase unit cost = 16 currency/unit, the result is 12 money. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

One homogeneous item and a single receipt. Sales timing, currency conversion and accounting-policy compliance are not inferred.

What to keep in mind

One homogeneous item and a single receipt. Sales timing, currency conversion and accounting-policy compliance are not inferred. Use consistent currencies, reporting periods and accounting definitions. This arithmetic estimate excludes items not entered in the form.

Common questions

How do I use this weighted average unit cost calculator?

Combine beginning stock and one purchase into a weighted average inventory unit cost. Enter beginning units in units, beginning unit cost in currency/unit, purchased units in units, purchase unit cost in currency/unit. The starting example is editable; use values for the same system or project.

Which assumptions affect this result?

One homogeneous item and a single receipt. Sales timing, currency conversion and accounting-policy compliance are not inferred.

Methodology maintained by ClarityKit. How these tools are built and checked.