On this page you will find links to tools I have used for some time and have had good success with (I am not the author nor creator of any of these tools, I link to them here as a convenience).
Links open to new windows.
If you think your Internet speed is slower than it should be, then this is a good way to be able to bring exact numbers to your Internet Service Provider (ISP). For best results, you should quit out of any other program that might use your Internet connection as you do this test, such as email programs.
Internet Speed Test: Windows and Mac
Either of the above sites should work to give you a good idea of your Internet speed.