iPerf is free open-source software which runs on a client-server model. It is useful for measuring throughput, packet loss, latency etc. The latest version (iPerf3) can be installed on Windows, Mac, Linux, and other operating systems and can be downloaded at https://iperf.fr
Below are some screenshots of iPerf in action.
iPerf client testing throughput in Mbps to server (188.8.131.52). The "-c" argument puts iPerf in client-mode. "-f m" is used to display throuput in Mbps.
iPerf server (184.108.40.206) must be set in advance to listen for client on specified port (default 5201).
After you install iPerf on your local PC, your can test it in client against one of the public servers listed below.