1Mbps is 100Kbps upload
2Mbps is 200Kbps upload
3Mbps is 300Kbps upload
10Mbps is 512Kbps upload
For torrents never set the upload more than 2/3's of your top upload speed. If you do you'll saturate it and end up with lower download speeds.
EG, on 10Mbps set your upload to no more than 40KB/s for best results. Some people find that a lower upload can get better download results. Thats certainly the case with me. I use 6-10KB/s on my 2Mbps connection. However its rare I use torrents so I might just be lucky at those times.
Hope this helps.