How long will it take?
Enter a file size and a connection speed to see how long a download or upload takes.
At full speed, that takes
100 Mbps moves about 13 Mo every second.
Real transfers usually run a little slower than the advertised speed.
Runs in your browser. Your files never leave this device.
Send the result with download.fyiThe math
Connection speeds are sold in megabits per second (Mbps). File sizes are measured in megabytes (MB). There are 8 bits in a byte, so a 100 Mbps connection moves at most 12.5 MB per second.
The calculator multiplies the size by 8 and divides by the speed. A 10 GB file at 100 Mbps takes 800 seconds: 13 minutes and 20 seconds.
Why real downloads take longer
- Every connection spends some of its speed on its own bookkeeping.
- Other devices and people on the same network share the speed.
- Upload speeds are often much lower than download speeds, and a transfer can only go as fast as the slower end.
- Wi-Fi far from the router is slower than a cable.
Questions
- What's the difference between Mbps and MB/s?
- Mbps is megabits per second, the unit internet plans use. MB/s is megabytes per second, the unit most download windows show. 1 MB/s is 8 Mbps.
- Does it use 1000 or 1024?
- 1000, the way internet providers and drive makers count. 1 GB here is 1,000,000,000 bytes.
- What's the fastest way to send a big file?
- Send it directly. download.fyi streams a file from your browser to theirs, so it travels once at the speed of the slower connection, instead of uploading first and downloading after.