Data Types Supported in PowerPivot Workbooks
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This section describes the data types that can be used in PowerPivot for Excel, and discusses the implicit conversion of data types when data is calculated or used in a Data Analysis Expressions (DAX) formula.
The following data types are supported for use in PowerPivot. When you import data or use a value in a formula, even if the original data source contains a different data type, the data is converted to one of the following data types. Values that result from formulas also use these data types.
In general, these data types are implemented to enable accurate calculations in calculated columns, and for consistency the same restrictions apply to the rest of the data in PowerPivot.
Formats used for numbers, currency, dates and times should follow the format of the locale that is specified on the computer that opens the workbook. You can use the formatting options in the worksheet to control the way that the value is displayed.
Data type in PowerPivot UI 
Data type in DAX 
Description 
Whole Number 
A 64 bit (eightbytes) integer value 1, 2 
Numbers that have no decimal places. Integers can be positive or negative numbers, but must be whole numbers between 9,223,372,036,854,775,808 (2^63) and 9,223,372,036,854,775,807 (2^631). 
Decimal Number 
A 64 bit (eightbytes) real number 1, 2 
Real numbers are numbers that can have decimal places. Real numbers cover a wide range of values: Negative values from 1.79E +308 through 2.23E 308 Zero Positive values from 2.23E 308 through 1.79E + 308 However, the number of significant digits is limited to 15 decimal digits. 
TRUE/FALSE 
Boolean 
Either a True or False value. 
Text 
String 
A Unicode character data string. Can be strings, numbers or dates represented in a text format. Maximum string length is 268,435,456 Unicode characters (256 mega characters) or 536,870,912 bytes. 
Date 
Date/time 
Dates and times in an accepted datetime representation. Valid dates are all dates after January 1, 1900. 
Currency 
Currency 
Currency data type allows values between 922,337,203,685,477.5808 to 922,337,203,685,477.5807 with four decimal digits of fixed precision. 
N/A 
Blank 
A blank is a data type in DAX that represents and replaces SQL nulls. You can create a blank by using the BLANK function, and test for blanks by using the logical function, ISBLANK. 
1 DAX formulas do not support data types that are smaller than those listed in the table.
2 If you attempt to import data that has very large numeric values, import might fail with the following error:
Inmemory database error: The '<column name>' column of the '<table name>' table contains a value, '1.7976931348623157e+308', which is not supported. The operation has been cancelled.
This error occurs because PowerPivot uses that value to represent nulls. The values in the following list are synonyms to the previous mentioned null value:
Value 
9223372036854775807 
9223372036854775808 
1.7976931348623158e+308 
2.2250738585072014e308 
You should remove the value from your data and try importing again.
Table Data Type
In addition, DAX uses a table data type. This data type is used by DAX in many functions, such as aggregations and time intelligence calculations. Some functions require a reference to a table; other functions return a table that can then be used as input to other functions. In some functions that require a table as input, you can specify an expression that evaluates to a table; for some functions, a reference to a base table is required. For information about the requirements of specific functions, see DAX Function Reference.
Each DAX function has specific requirements as to the types of data that are used as inputs and outputs. For example, some functions require integers for some arguments and dates for others; other functions require text or tables.
If the data in the column that you specify as an argument is incompatible with the data type required by the function, DAX in many cases will return an error. However, wherever possible DAX will attempt to implicitly convert the data to the required data type. For example:

You can type a date as a string, and DAX will parse the string and attempt to cast it as one of the Windows date and time formats.

You can add TRUE + 1 and get the result 2, because TRUE is implicitly converted to the number 1 and the operation 1+1 is performed.

If you add values in two columns, and one value happens to be represented as text ("12") and the other as a number (12), DAX implicitly converts the string to a number and then does the addition for a numeric result. The following expression returns 44: = "22" + 22

If you attempt to concatenate two numbers, the PowerPivot addin will present them as strings and then concatenate. The following expression returns "1234": = 12 & 34
The following table summarizes the implicit data type conversions that are performed in formulas. In general, PowerPivot behaves like Microsoft Excel, and performs implicit conversions whenever possible when required by the specified operation.
Table of Implicit Data Conversions
The type of conversion that is performed is determined by the operator, which casts the values it requires before performing the requested operation. These tables list the operators, and indicate the conversion that is performed on each data type in the column when it is paired with the data type in the intersecting row.
Note 

Text data types are not included in these tables. When a number is represented as in a text format, in some cases PowerPivot will attempt to determine the number type and represent it as a number. 
Addition (+)
Operator (+) 
INTEGER 
CURRENCY 
REAL 
Date/time 
INTEGER 
INTEGER 
CURRENCY 
REAL 
Date/time 
CURRENCY 
CURRENCY 
CURRENCY 
REAL 
Date/time 
REAL 
REAL 
REAL 
REAL 
Date/time 
Date/time 
Date/time 
Date/time 
Date/time 
Date/time 
For example, if a real number is used in an addition operation in combination with currency data, both values are converted to REAL, and the result is returned as REAL.
Subtraction ()
In the following table the row header is the minuend (left side) and the column header is the subtrahend (right side).
Operator () 
INTEGER 
CURRENCY 
REAL 
Date/time 
INTEGER 
INTEGER 
CURRENCY 
REAL 
REAL 
CURRENCY 
CURRENCY 
CURRENCY 
REAL 
REAL 
REAL 
REAL 
REAL 
REAL 
REAL 
Date/time 
Date/time 
Date/time 
Date/time 
Date/time 
For example, if a date is used in a subtraction operation with any other data type, both values are converted to dates, and the return value is also a date.
Note 

PowerPivot also supports the unary operator,  (negative), but this operator does not change the data type of the operand. 
Multiplication (*)
Operator (*) 
INTEGER 
CURRENCY 
REAL 
Date/time 
INTEGER 
INTEGER 
CURRENCY 
REAL 
INTEGER 
CURRENCY 
CURRENCY 
REAL 
CURRENCY 
CURRENCY 
REAL 
REAL 
CURRENCY 
REAL 
REAL 
For example, if an integer is combined with a real number in a multiplication operation, both numbers are converted to real numbers, and the return value is also REAL.
Division (/)
In the following table the row header is the numerator and the column header is the denominator.
Operator (/) (Row/Column) 
INTEGER 
CURRENCY 
REAL 
Date/time 
INTEGER 
REAL 
CURRENCY 
REAL 
REAL 
CURRENCY 
CURRENCY 
REAL 
CURRENCY 
REAL 
REAL 
REAL 
REAL 
REAL 
REAL 
Date/time 
REAL 
REAL 
REAL 
REAL 
For example, if an integer is combined with a currency value in a division operation, both values are converted to real numbers, and the result is also a real number.
Comparison operators
In comparison expressions Boolean values are considered greater than string values and string values are considered greater than numeric or date/time values; numbers and date/time values are considered to have the same rank. No implicit conversions are performed for Boolean or string values; BLANK or a blank value is converted to 0/""/false depending on the data type of the other compared value.
The following DAX expressions illustrate this behavior:
=IF(FALSE()>"true","Expression is true", "Expression is false"), returns "Expression is true"
=IF("12">12,"Expression is true", "Expression is false"), returns "Expression is true"
=IF("12"=12,"Expression is true", "Expression is false"), returns "Expression is false"
Conversions are performed implicitly for numeric or date/time types as described in the following table:
Comparison Operator 
INTEGER 
CURRENCY 
REAL 
Date/time 
INTEGER 
INTEGER 
CURRENCY 
REAL 
REAL 
CURRENCY 
CURRENCY 
CURRENCY 
REAL 
REAL 
REAL 
REAL 
REAL 
REAL 
REAL 
Date/time 
REAL 
REAL 
REAL 
Date/time 
The way that DAX handles zero values, nulls, and empty strings is different from both Microsoft Excel and SQL Server. This section describes the differences, and describes how these data types are handled.
The important thing to remember is that, in PowerPivot, a blank value, an empty cell, or a missing value are all represented by the same new value type, a BLANK. How blanks are handled in operations, such as addition or concatenation, depends on the individual function. You can also generate blanks by using the BLANK function, or test for blanks by using the ISBLANK function. Database nulls are not supported within a PowerPivot workbook, and nulls are implicitly converted to blanks when a column that contains a null value is referenced in a DAX formula.
Defining Blanks, Nulls and Empty Strings
The following table summarizes the differences between DAX and in Microsoft Excel, in the way that blanks are handled.
Expression 
DAX 
Excel 
BLANK + BLANK 
BLANK 
0 (zero) 
BLANK +5 
5 
5 
BLANK * 5 
BLANK 
0 (zero) 
5/BLANK 
Infinity 
Error 
0/BLANK 
NaN 
Error 
BLANK/BLANK 
BLANK 
Error 
FALSE OR BLANK 
FALSE 
FALSE 
FALSE AND BLANK 
FALSE 
FALSE 
TRUE OR BLANK 
TRUE 
TRUE 
TRUE AND BLANK 
FALSE 
TRUE 
BLANK OR BLANK 
BLANK 
Error 
BLANK AND BLANK 
BLANK 
Error 
For details on how a particular function or operator handles blanks, see the individual topics for each DAX function, in the section, DAX Function Reference.