How to calculate current stock or inventory in Excel

This tutorial covers basic inventory formula.

To calculate current stock, or inventory, you can use Excel Tables with a formula based on the SUMIF function.

Formula

=SUMIFS(In[Qty],In[Color],A1)-SUMIFS(Out[Qty],Out[Color],A1)

Explanation

In the example shown, the formula in K7 is:

=SUMIFS(In[Qty],In[Color],J7)-SUMIFS(Out[Qty],Out[Color],J7)

Where “In” is the Excel Table on the left, “Out” is the table in the middle.

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How this formula works

This formula demonstrates a very simple inventory concept where current inventory is simply the result of all incoming stock minus all outgoing stock. In the example, colors are treated as unique item identifiers – imagine a product available in one size only in just three colors: red, blue, or green.

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The key to this approach is to use Excel Tables, because Table ranges automatically expand to handle changes in data. This means we can get a total of all incoming red items with:

=SUMIFS(In[Qty],In[Color],J7)

And a total of all outgoing red items with:

=SUMIFS(Out[Qty],Out[Color],J7)

In both cases, the SUMIFS function generates a total for all red items in each table.

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Then, as long as both tables are up to date and complete, we can get the current inventory of red items with the following formula:

=SUMIFS(In[Qty],In[Color],J7)-SUMIFS(Out[Qty],Out[Color],J7)

As the formula is copied down, we get current inventory for each color.

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