I have two columns in a pivot table. Count of Work orders, and Sum of the Cost. I want to insert a calculated field that simply divides the sum of cost by count of work orders to get an average per work order.
When I put I insert a calculated field with the following formula, it yields the total cost, not the average. You'll see the fields are subtotal (cost) and WO#(work order)
And here is what the output looks like in my pivot table.
When you add a calculated field in a pivot table, you need to only add the reference, not a calculation inside of it, so you don't need to add Sum or Count in your definition. However, Excel works calculated fields in a very infuriating manner - first it adds your values and then performs the calculation - if, for example, I have a calculated field that's simply field3=field2/field1, when I want to display the SUM of these values, instead of sum(field3), it does sum(field2)/sum(field1)
I would recommend doing this calculation outside of the pivot.
For example, see my results when I have the following table as input for a pivot
I had the same issue and found the answer I needed. Like the OP, I want to calculate an average -- SUM(field 1) divided by COUNT(field 2) -- but the problem with this is that there are two functions in the same formula (SUM divided by COUNT). As we have seen, using multiple functions in the same calculation produces unintended results.
The key that worked for me was to create a new field (field 3) in the raw data with a formula that assigns a 1 to items I want to count and a 0 to items I don not want to count, so the count of this column is just the sum. In this way, I convert COUNT(field 2) in the denominator to SUM(field 3). So, the result I need is now SUM divided by SUM, same function on top and bottom, which Excel can handle. And luckily for me in this situation, Excel's "infuriating manner" of calculating is exactly what I want.
As Fernando stated, the calculated field should just refer to the field itself; it shouldn't use SUM or COUNT or anything else. The function you want will be applied when you add the field to the pivot table and you choose the function you want.
I set my calculated function to be [field 1 / field 3], with an IF statement to avoid division by 0, and I used the SUM function when I put the calculated field in the pivot table. The end result is SUM(field 1) / SUM(field 3), which equals SUM(field 1) / COUNT(field 2)
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