You should be getting about...4Mbps. 1Mbps = 1000 kbps, and 1kB/s = 8 kbps.
As for your speeds, it's impossible to comment without more information, like where you're getting those speeds from (source, protocol et al), what type of connection (ADSL or cable) you've got, who your ISP is, (if it's ADSL) some statistics from your modem or router, (if it's IPStream ADSL) the output from the BT Speedtester (instructions in FAQ).