Estimate how long it takes to download any file based on your internet speed. Compare 3G, 4G, 5G, and fiber download times instantly. 100% client-side.
This free online tool helps you estimate how long it will take to download a file based on your internet connection speed. Simply enter the file size and your connection speed to get an instant estimate. The tool also compares download times across common connection types — from 3G to gigabit fiber — so you can understand how your speed stacks up.
The calculator provides a theoretical estimate based on your stated connection speed. Real-world download times may vary due to network congestion, server response time, protocol overhead, and other factors. Typically, actual speeds are 80-90% of the advertised speed.
Mbps (megabits per second) is the standard unit ISPs use to advertise speeds. MB/s (megabytes per second) is what you see in your browser download manager. To convert: divide Mbps by 8 to get MB/s. For example, 100 Mbps = 12.5 MB/s.
Real-world speeds are affected by many factors: network congestion, distance to the server, WiFi signal strength, the server's upload capacity, and protocol overhead. The calculator assumes ideal conditions, so actual times are usually 10-20% longer.