Display swap space utilization

On FreeBSD, you can use pstat -s to display swap space utilization:

# pstat -s
Device          1K-blocks     Used    Avail Capacity
/dev/da0p3        1048540        0  1048540     0%

There is another specified swapinfo command you can use:

# swapinfo
Device          1K-blocks     Used    Avail Capacity
/dev/da0p3        1048540        0  1048540     0%

You can also display swap info in "Human-readable" format:

# swapinfo -h
Device          1K-blocks     Used    Avail Capacity
/dev/da0p3        1048540       0B     1.0G     0%

Or display swap space size in megabyte unit:

# swapinfo -m
Device          1M-blocks     Used    Avail Capacity
/dev/da0p3           1023        0     1023     0%

References:
PSTAT.