Hard drive usage status from linux

How to get the hard disk usage status from linux OS?

Simple command df -h

Output will be

Filesystem            Size  Used Avail Use% Mounted on
simfs                 4.0G  1.4G  2.7G  34% /

here -h for human readable format. Otherwise only df command with -h for disk space will display in below format

Filesystem           1K-blocks      Used Available Use% Mounted on
simfs                  4194304   1422100   2772204  34% /

Thanks
Wolf.