Visual Basic for Applications Reference

Len Function

See Also Example Specifics

Returns a Long containing the number of characters in a string or the number of bytes required to store a variable.


Len(string | varname)

The Len function syntax has these parts:

Part Description
string Any valid string expression. If string contains Null, Null is returned.
Varname Any valid variable name. If varname contains Null, Null is returned. If varname is a Variant, Len treats it the same as a String and always returns the number of characters it contains.


One (and only one) of the two possible argument must be specified. With user-defined types, Len returns the size as it will be written to the file.

*Note* Use the LenB function with byte data contained in a string, as in double-byte character set (DBCS) languages. Instead of returning the number of characters in a string, LenB returns the number of bytes used to represent that string. With user-defined types, LenB returns the in-memory size, including any padding between elements. For sample code that uses LenB, see the second example in the example topic.

*Note* Len may not be able to determine the actual number of storage bytes required when used with variable-length strings in user-defineddata types.