How do I determine the size of my bash history file?

[indigowinged]

       HISTSIZE
              The number of commands to remember in the command  history  (see
              HISTORY  below).   If  the value is 0, commands are not saved in
              the history list.  Numeric values less than zero result in every
              command  being  saved  on  the history list (there is no limit).
              The shell sets the  default  value  to  500  after  reading  any
              startup files.

Echoing the variable displays number of lines the history file can store.

$ echo $HISTSIZE
1000