Free space at disk

Hi,

I would like to create the new file system(mount point) in our unix server.
before that i would like to know the total free space available in /home directory.

Can you please let me know, how to find free space available for new filesystem?

 
du -h /home

I have run the df -h command and find the follwing output.
/dev/vx/dsk/data001/XXXXXXX_ext
11G 8.5G 2.0G 82% /ORACLE/XXXXXXX/ext
/dev/vx/dsk/data001/var_bafir
4.9G 5.1M 4.9G 1% /var/applications/bafir
/dev/vx/dsk/data001/XXXXXXX_flash
21G 58M 21G 1% /ORACLE/XXXXXXX/flashback
/dev/vx/dsk/data001/XXXXXXX_audit
1.1G 415M 606M 41% /ORACLE/XXXXXXX/audit
/dev/vx/dsk/data001/XXXXXXX_log
65M 50M 8.3M 86% /ORACLE/XXXXXXX/base/log

-------------

But i would like to know, what the free space available in mount point . then I will create the new file system for my application.