Using the Excel COUNTIF function.
The COUNTIF function finds all of the values in a range that meet the criteria you specify and counts them.
COUNTIF( range, criteria )
Range - The range of values to test the criteria against.
Criteria - The condition that must be met for a value to be included in the count.
The criteria can be a date, a time, an integer, a decimal, a logical (TRUE or FALSE), text, or a logical expression. A logical expression is an expression that includes a comparison operator, for example ">10". Text and logical expressions must be enclosed in quotes. If your logical expression references a cell, place an ampersand(&) before the cell address ("<"&A1). Text criteria is not case sensitive, so "DOG" and "dog" are equivalent.
You can use wildcards with text criteria. The asterisk (*) matches any sequence of characters. For example, ABC*123 matches, ABC---123, ABC-/@4-123 and ABC+123. The question mark (?) matches any single character. For example, ABC?123 matches, ABC-123, ABC/123 and ABCD123. It will not match ABC---123 or ABC-/@4-123. If you want to match the asterisk (*) or the question mark, place a tilde (~) before the character.
Example 1: You have a list of people. Their sex is listed in cells B2 through B11. You want to find the number of people who are female.
Example 2: You have a list of people. Their age is listed in cells C2 through C11. You want to find the number of people who are over 40.
Example 3: You have a list of people. Their age is listed in cells C2 through C11. You want to find the number of people whose age is greater than the criteria in cell F1.
In the following worksheet, all of the cells with orange text contain a calculation. Double click in the field to display the formula. Feel free to use the worksheet to experiment in any way you like.