When working with data, it is common to have duplicate values in a range. Please check here to count the number of unique values in a range. In this post, we will figure out how to count the number of cells without duplicates in a range, or the numbers only appear once.
The COUNTIF function counts the number of cells that meet a criterion, and the SUMPRODUCT function returns the product of numbers in an array.
Example: In the following database, the first name is in column A, the last name is in column B, and the salary is in column C.
Formula 1: To count the number of cells without duplicates in column B
=SUMPRODUCT(–(COUNTIF(B2:B12,B2:B12)=1))
=SUMPRODUCT((COUNTIF(B2:B12,B2:B12)=1)*1)
- Step 1: COUNTIF(B2:B12, B2:B12): to count the frequency of each value (e.g., the frequency of JONES is 2);
- Step 2: (COUNTIF(B2:B12, B2:B12)=1): to check the frequency of value, and returns true if it equals 1, or false if not equals 1;
- Step 3: The double hyphens (or times 1): to convert the logical value true into one and false into zero;
- Step 4: The SUMPRODUCT function returns the sum of the products of the new array.
In the example, there are three values in column B that have no duplicates.
Formula 2: To count the number of cells in column C that have no duplicates
=SUMPRODUCT(–(COUNTIF(C2:C12,C2:C12)=1))
=SUMPRODUCT((COUNTIF(C2:C12,C2:C12)=1)*1)
- Step 1: COUNTIF(C2:C12, C2:C12): count each value's frequency (e.g., 84,923 is 2);
- Step 2: (COUNTIF(C2:C12, C2:C12)=1): to check the frequency of value, and returns true if it equals 1, or false if not equals 1;
- Step 3: The double hyphens (or times 1): convert the logical value true into one and false into zero;
- Step 4: The SUMPRODUCT function returns the sum of the products of the new array.
In the example, four values in column C have no duplicates.
Notes: The SUMPRODUCT Function
The SUMPRODUCT function adds all the multiplication results for all arrays.
Formula:
=SUMPRODUCT(array1, [array2], …)
Explanations:
– Array1 is required; the first array is to multiply and then add.
– Array2 is optional; the second array is to multiply and then add.
