Command line speed test
Solution 1:
As you are obviously fine with estimates, use bing. There are also a couple of public iperf servers available - just run a Google query or use iperf.eltel.net if you feel lazy today. Iperf in UDP mode is also capable of providing packet loss rate and jitter informaion.
If you need consistent and reliable information, you obviously should not rely on free public services, but run your own, monitored iperf servers.