Expression

Required. Expression to be formatted.

NumDigitsAfterDecimal

Optional. Numeric value indicating how many places to the right of the decimal are displayed. Default value is -1, which indicates that the computer's regional settings are used.

IncludeLeadingDigit

Optional. Tristate constant that indicates whether or not a leading zero is displayed for fractional values. See Settings section for values.

UseParensForNegativeNumbers

Optional. Tristate constant that indicates whether or not to place negative values within parentheses. See Settings section for values.

GroupDigits

Optional. Tristate constant that indicates whether or not numbers are grouped using the group delimiter specified in the control panel. See Settings section for values.

The IncludeLeadingDigit, UseParensForNegativeNumbers, and GroupDigits arguments have the following settings:

When one or more of the optional arguments are omitted, the values for omitted arguments are provided by the computer's regional settings.

Note:
All settings information comes from the Regional Settings Number tab.

The following example illustrates the use of the FormatNumber statement.

Dim number
number = -12345.6789123

' The NumDigitsAfterDecimal parameter is set to 3.
MsgBox (FormatNumber(number, 3))

' The UseParensForNegativeNumbers parameter is set to true.
MsgBox (FormatNumber (number, 3, , vbTrue))

' The GroupDigits parameter is set to false.
MsgBox (FormatNumber (number, 3, , , vbFalse))

Version 2

Reference