How to sum cells by criteria

To sum cells by criteria, do the following:

   1.   Select the cell that will contain the result.

   2.   Do one of the following:

• On the Formula tab, in the Function Library group, select the Math & Trig button:
  

  Choose SUMIF in the list.

• Click the Insert Function button in the left of the Formula bar:
  

  In the Insert Function dialog box:

  
  • select Math & Trig in the Or select a category drop-down list,
  • select SUMIF in the Select a function list.

   3.   In the Function Arguments dialog box:

• The Range field determines the range of cells Excel will look to perform the count in. In this example, the cell range is B2:B21.
• The Criteria is a conditional statement that is similar to the conditional statement in the IF statement.
• The Sum_range field tells Excel which cells to add when the criteria are met for each cell in the range. In this example, the cell range is D2:D21.

   4.   Press OK.

Notes:

• You can enter this formula using the keyboard, for this example:
  = SUMIF (B2:B21, "*Revay", D2:D21)
• You can use the wildcard characters, question mark (?), the asterisk (*) in the criteria. A question mark matches any single character; an asterisk matches any sequence of characters. If you want to find an actual question mark or asterisk, type a tilde (~) before the character. For example:
  
• Microsoft Excel provides additional functions that can be used to analyze your data based on a condition or criteria:
  • To count the number of occurrences of a string of text or a number within a range of cells, use the COUNTIF function (see How to count cells by criteria for more details).
  • To have a formula return one of two values based on a condition, use the IF function.
  • To analyze data in a list based on criteria, such as profit margins or product types, use the database and list management functions (DCOUNT, DCOUNTA, DSUM, etc.).

See also this tip in French: Comment calculer la somme des cellules par critères.