Download Time Calculator

How long will it take to download that file, back up your photos, or pull down a game update? This calculator answers it in seconds. Enter the file size, choose its unit from megabytes through to terabytes, and enter your connection speed in megabits per second, and it returns the time the transfer should take in hours, minutes and seconds. It works just as well for uploads, so you can estimate how long it will take to send a large video, push a backup to the cloud, or share a folder. The calculation hinges on one detail that trips a lot of people up: file sizes are measured in bytes while internet speeds are measured in bits, and there are eight bits in a byte. That is why a 100 megabit per second connection only downloads at about 12.5 megabytes per second, and why a download can feel slower than the big number on your plan suggests. The calculator handles that conversion for you, turning the file size into bits and dividing by the speed, so you do not have to remember the factor of eight or juggle units. It is genuinely useful for planning: deciding whether a download will finish before you need to leave, comparing how much faster a fibre plan would be, working out if your connection can handle a large transfer in the time available, or simply setting expectations before you hit go. Keep in mind the result is a best case at the speed you enter, because real transfers are also limited by the server, Wi-Fi and network congestion, so allow a little extra. The formula and a worked example are explained below.

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