Usually your hosting company provides this information through MRTG for megabits on 95th or if you want an exact per gig figure they may have a billing package to provide that. If you use webstats like webalizer or other packages they arent really all that accurate, so the best thing to do would be to run an ipfw rule to count your packets.
ipfw add 1 allow ip any to any out
ipfw add 1 allow ip any to any in
then ipfw show
And you will see the number of packets transmitted as well as the number of bytes which you can calculate to gigs, then just reset it at the start of the new month, ipfw zero.
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