Finding out size of sub-directory

Hi,

Is there a way to find out the size of a sub-directory?
Eg subidrectory in main directory /data, like this : /data/solr-5.3.1 .

When I do a df -h /data/solr-5.3.1 , it still gives the size of /data:

root@L28condor:/data/solr-5.3.1# df -h .
Filesystem                        Size  Used Avail Use% Mounted on
/dev/mapper/L28condor--vg-lvdata  9.2T  4.8T  4.0T  55% /data

Is it possible to get ONLY the size of /data/solr-5.3.1 ?

Regards,
Aigini

Did you consider the du (disk usage) command?