Start the speed test by clicking on the big button in the center of the page. The check will start by downloading a file and will measure your download speed. Once the download has finished, the broadband speed test will try to upload a file and will measure your upload speed. If you want to get accurate results then you should not use your internet connection for any other applications once the speed checker is running. The broadband speed is measured in kbps (kilobits per second). Approximately 1000 Kbps is 1Mb/s.