See Free Memory

The best way to check the amount of free memory in a Linux system is to use the free command. This command lists the amount of free memory.

Check System’s Free Memory

free
              total        used        free      shared  buff/cache   available
Mem:       65908812      244948    64239140      206180     1424724    64672848
Swap:      50226172           0    50226172

Check System’s Free Memory In A More Human Readable Format

free -h
              total        used        free      shared  buff/cache   available
Mem:            62G        239M         61G        209M        1.4G         61G
Swap:           47G          0B         47G