Sum unique distinct numbers
The image above shows numbers in column B, some of these numbers are duplicates. The formula in D12 adds unique distinct numbers meaning the first instance of each number is added to the total, however, the duplicates are ignored.
Explaining formula in cell D12
If you want to examine the formula yourself then go to tab "Formula" on the ribbon and then click "Evaluate Formula" button.
This will show the calculation steps, one at a time. Simply click the Evaluate button to move to next calculation step.
Step 1 - Count each value in cell range
The COUNTIF function counts each value in the cell range and returns an array of numbers which shows the number of instances each value has.
COUNTIF(B3:B15,B3:B15)
becomes
COUNTIF({9;8;7;1;2;6;3;1;7;2;8;2;6},{9;8;7;1;2;6;3;1;7;2;8;2;6})
and returns
{1;2;2;2;3;2;1;2;2;3;2;3;2}.
Step 2 - Divide 1 with array
If a number has a duplicate then there are two instances of that value. Divide 1 with 2 and we get 0.5, now multiply that value with the number and we get the number to add to the total.
1/COUNTIF(B3:B15,B3:B15)
becomes
1/{1;2;2;2;3;2;1;2;2;3;2;3;2}
and returns
{1;0.5;0.5;0.5;0.333333333333333;0.5;1;0.5;0.5;0.333333333333333;0.5;0.333333333333333;0.5}
Step 3 - Multiply with numbers
The parentheses make sure that the order of calculation is correct.
(1/COUNTIF(B3:B15,B3:B15))*B3:B15
becomes
{1;0.5;0.5;0.5;0.333333333333333;0.5;1;0.5;0.5;0.333333333333333;0.5;0.333333333333333;0.5}*B3:B15
and returns
{9;4;3.5;0.5;0.666666666666667;3;3;0.5;3.5;0.666666666666667;4;0.666666666666667;3}
Step 4 - Add numbers
The SUMPRODUCT function is a better option than the SUM function, we don't need to enter the formula as an array formula now.
SUMPRODUCT((1/COUNTIF(B3:B15,B3:B15))*B3:B15)
becomes
SUMPRODUCT({9;4;3.5;0.5;0.666666666666667;3;3;0.5;3.5;0.666666666666667;4;0.666666666666667;3})
and returns 36 in cell D12.
Download Excel *.xlsx file
Sum values between two dates and based on a condition
In this post, I will provide a formula to sum values in column (Qty) where a column (Date) meets two [โฆ]
Running totals based on criteria
Andrew asks: LOVE this example, my issue/need is, I need to add the results. So instead of States and Names, [โฆ]
The formula in cell D3 adds all unique numbers in cell range B3:B12 and returns the total. Unique values are all [โฆ]
Find empty cells and sum cells above
Is it possible to quickly select all empty cells and then sum cells above to next empty cell? Can I have [โฆ]
Question: It's easy to sum a list by multiple criteria, you just use array formula a la: =SUM((column_plane=TRUE)*(column_countries="USA")*(column_producer="Boeing")*(column_to_sum)) But all [โฆ]
Katie asks: I have 57 sheets many of which are linked together by formulas, I need to get numbers from [โฆ]
The SUM function in cell D3 uses only a single cell reference and still manages to sum current and previous [โฆ]
The SUBTOTAL function lets you sum values in a cell range that have some rows hidden or filtered, the picture [โฆ]
The easiest way to sum a cell range is to simply select the cell range and read the values in [โฆ]
Leave a Reply
How to comment
How to add a formula to your comment
<code>Insert your formula here.</code>
Convert less than and larger than signs
Use html character entities instead of less than and larger than signs.
< becomes < and > becomes >
How to add VBA code to your comment
[vb 1="vbnet" language=","]
Put your VBA code here.
[/vb]
How to add a picture to your comment:
Upload picture to postimage.org or imgur
Paste image link to your comment.
English
Spanish
