netzclub

Netzclub

32 kbps = 32/8 = 4kBps
30 days = 2592000 seconds

10368000 kB per month
10368 MB per month
10.3 GB per month

Lower case b stands for a bit, while capital B is a byte, which is made of 8 bits. So when you get 56 kb/s you actually get 56/8 = 7 kB/s.
This gives you 1814400 kB per month.
17719 MB or 17.3 GB per month

Simyo

56kbps
56/8 = 7 kB/s
1814400 kB per month
18144 MB per month or
18.1 GB