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How to interpret area reported by Genus in mm2

abarajithan11
I'm a student and new to ASIC design. Kindly let me know the steps I need to follow to interpret Total Area: 554138.039 as reported by Genus, in mm2.
I don't see any units in lib files, although gate areas are specified as float numbers.
 
When I connect lib, lef and captab files and synthesize my design with Genus, I get the following area.log, where area is reported as:
              Instance                   Module                        Cell Count  Cell Area   Net Area   Total Area
--------------------------------------------------------------------------------------------------------------------------------------
axis_accelerator_asic                                                 173900 413038.483 141099.556   554138.039 
I need to find the area of my design in mm^2. I checked the lib files, which specify an area for cells as follows, but it DOES NOT specify any area units:
/*******************************************************************
*                   LIBRARY :   tcbn45gsbwptc
*                   Author  :   STDCELL
*                   Method  :   Stuff cells delay Using
*                               CHEETAH(TSMC ASIC CELL CHARACTERIZATION)
*                   Comment :   This library was created by
*                               TSMC SYNOPSYS TEMPLATE library
*                               and stuffed timing using CHEETAH.
*                               Engineer should take care of  library dependent
*                               technology such as template,
*                               voltage, process k factor and
*                               wire-load etc
*                      Unit :
*                               time : ns
*                               capacitance : pf
*                   Update  :
*                               version 120
*                               Fri Nov 13 10:59:41 CST 2009
*                               (1) Stuff CHEETAH timing
********************************************************************/
/* ------------------- *
 * Design : CKND2D1BWP *
 * ------------------- */
cell (CKND2D1BWP) {
  area : 0.7056;
  cell_footprint : "cknd2d1";
  pg_pin (VDD) {
    pg_type : primary_power;
    voltage_name : COREVDD1;
  }
How do I find the area units and how do I interpret 554138.039  in mm2?

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