How to collect Memory utilization in linux

How to collect Memory utilization

Ran the below command

sar -rq 1
Linux 2.6.31-201.18.1.el5uek (abcdef.testing.com)    01/25/2014

01:28:07 AM kbmemfree kbmemused  %memused kbbuffers  kbcached kbswpfree kbswpused  %swpused  kbswpcad
01:28:08 AM  14303340 250232948     94.59   1688944 144753888  25165816         0      0.00         0

01:28:07 AM   runq-sz  plist-sz   ldavg-1   ldavg-5  ldavg-15
01:28:08 AM         2      2085      1.34      1.39      1.36

Average:    kbmemfree kbmemused  %memused kbbuffers  kbcached kbswpfree kbswpused  %swpused  kbswpcad
Average:     14303340 250232948     94.59   1688944 144753888  25165816         0      0.00         0

Average:      runq-sz  plist-sz   ldavg-1   ldavg-5  ldavg-15
Average:            2      2085      1.34      1.39      1.36

Memory utilization = (kbmemused-kbcached-)*100/(kbmemfree+kbmemused)

Some uses
Memory utilization = (kbmemused-kbcached-kbbuffers)*100/(kbmemfree+kbmemused)