NetMeter

NetMeter is a useful tool which lets you know how much bandwidth you use. NetMeter logs a graph where you will be able to know at a glance if you are using a lot of it or not. It is a good network bandwidth monitoring program.

The graph produced let you know the consumption for hours, days or even months, so you can observe how much do you use it, the speed you are experiencing and if you would be able to power it up.

If you want to know how fast your connection is, NetMeter is a good choice. It's easy-to-use and easy to understand. You only have to run it and it will monitor your internet speed and consumption.