Free tool
Enter a file size and your connection speed to see a realistic upload and download time, with the overhead real networks add. Free, no signup, nothing uploaded.
Upload speed is often much lower than download, check the upload number on a speed test.
Upload time
About 3 min 51 sec to 4 min 12 sec
At 20 Mbps. Best case with no overhead: 3 min 30 sec.
Download time
About 46 seconds to 50 seconds
At 100 Mbps. Best case with no overhead: 42 seconds.
Estimate only. The range adds 10 to 20% for protocol overhead and Wi-Fi. Nothing you type leaves your browser.
Gratuit : tout inclus, 50 liens, jusqu'à 250 MB · Pro : liens illimités, fichiers plus volumineux
Upload time is file size in bits divided by your upload speed. Multiply the size in megabytes by 8 to get megabits, divide by your Mbps, then add about 10 to 20% for protocol overhead. A 500 MB file on a 20 Mbps upload takes about 3.5 minutes in theory and roughly 4 minutes in practice.
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brand-film.mp4
84 MB
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ouvertures
Right-click the file and open Properties (Windows) or Get Info (Mac) to see its size, then type it in with the right unit: KB, MB or GB.
Run any speed test and note the upload number in Mbps. That is the one that limits how fast a file leaves your device. Pick a preset if you only know your plan speed.
The calculator shows a best case with no overhead and a realistic range with 10 to 20% added. If the result is hours, try a wired connection or a quieter time of day.
Internet speeds are sold in megabits per second (Mbps, small b). File sizes are measured in megabytes (MB, big B). One byte is 8 bits, so a 100 Mbps connection moves at most about 12 megabytes per second, not 100. Most surprise at slow uploads comes from reading Mbps as MB/s. This calculator does the conversion for you, and counts file sizes the way Windows and this site do: 1 MB is 1,024 KB and 1 GB is 1,024 MB.
Every file travels in packets wrapped in TCP/IP, TLS encryption and HTTP framing, and some packets are resent. Together that usually costs somewhere around 10 to 20% of your line speed. That figure is an estimate, not a constant: it depends on the server, the distance and how busy your network is. The best case shown is the theoretical floor; the range is what to plan around.
A wired Ethernet connection usually gets close to the speed you pay for. Wi-Fi often does not: walls, distance from the router, neighbouring networks and other devices on the same network can cut real throughput well below the plan speed. For a big upload, plug in a cable or sit near the router, and pause cloud backups and streaming on other devices while it runs.
If you are sending the same large file to several people, upload it one time and send a link instead of attaching it again and again. On Link in Seconds a free file can be up to 250 MB, and the people you share it with stream or download it in the browser without an account.
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