Upload/Download time calculator calculates the time required to upload a file according to your internet speed, you need to upload any file. It is just calculation to get an idea about how much time it will take? You just need to enter File Size and your Internet Speed. rest will be done by the tool itself.
for e.g if you have a file of 500 MB and you have internet speed of 100 Mbit/s then it will take 40 Seconds to Upload a file. Be sure you have to enter your correct internet speed to get actual time required to complete the task.
You can check your internet speed at speedtest.net