Free Disk space with human readable numbers

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$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1        46G   19G   26G  42% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
udev            2.0G  4.0K  2.0G   1% /dev
tmpfs           396M  1.3M  394M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            2.0G  144K  2.0G   1% /run/shm
none            100M   28K  100M   1% /run/user
/dev/sda5       395G  355G   20G  95% /home