SUMIF

Adds the cells specified by a given criteria.
Syntax
SUMIF(range,criteria,sum_range)
Range    is the range of cells you want evaluated.
Criteria    is the criteria in the form of a number, expression, or text that defines which cells will be added. For example, criteria can be expressed as 32, "32", ">32", "apples".
Sum_range    are the actual cells to sum.
Remarks

• The cells in sum_range are summed only if their corresponding cells in range match the criteria.
  
• If sum_range is omitted, the cells in range are summed.
  
• Microsoft Excel provides additional functions that can be used to analyze your data based on a condition. For example, to count the number of occurrences of a string of text or a number within a range of cells, use the COUNTIF function. To have a formula return one of two values based on a condition, such as a sales bonus based on a specified sales amount, use the IF function.
  

Example
The example may be easier to understand if you copy it to a blank worksheet.

	A	B
1	Property Value	Commission
2	100,000	7,000
3	200,000	14,000
4	300,000	21,000
5	400,000	28,000

Formula	Description (Result)
=SUMIF(A2:A5,">160000",B2:B5)	Sum of the commissions for property values over 160000 (63,000)

SUM

SUM

Adds all the numbers in a range of cells.
Syntax
SUM(number1,number2, ...)
Number1, number2, ...    are 1 to 30 arguments for which you want the total value or sum.
Remarks

• Numbers, logical values, and text representations of numbers that you type directly into the list of arguments are counted. See the first and second examples following.
• If an argument is an array or reference, only numbers in that array or reference are counted. Empty cells, logical values, text, or error values in the array or reference are ignored. See the third example following.
• Arguments that are error values or text that cannot be translated into numbers cause errors.

Example

The example may be easier to understand if you copy it to a blank worksheet.

1 2 3 4 5 6

A Data -5 15 30 '5 TRUE

Formula	Description (Result)
=SUM(3, 2)	Adds 3 and 2 (5)
=SUM("5", 15, TRUE)	Adds 5, 15 and 1, because the text values are translated into numbers, and the logical value TRUE is translated into the number 1 (21)
=SUM(A2:A4)	Adds the first three numbers in the column above (40)
=SUM(A2:A4, 15)	Adds the first three numbers in the column above, and 15 (55)
=SUM(A5,A6, 2)	Adds the values in the last two rows above, and 2. Because nonnumeric values in references are not translated, the values in the column above are ignored (2)