Media Doctor · Free tool
Before a long download, know how long it will take. Enter a file size, or a video’s length and quality, and your internet speed to get a realistic time, plus the times at other common speeds.
Runs in your browser. It only does arithmetic; nothing is downloaded or uploaded.
Windows apps from SteveShines
Save supported videos and streams to your PC in the background.
Save M3U8 and HLS streams as MP4 on Windows.
Paste a supported link and save the video locally.
Video downloader and local media toolkit.
Time (seconds) = size in megabits ÷ real speed in Mbps. A gigabyte is 8,000 megabits, so 2.5 GB at a real 85 Mbps takes 20,000 ÷ 85 ≈ 235 seconds, about 4 minutes.
Streams list their qualities and bitrates in the playlist: paste an .m3u8 link into the M3U8 Inspector to see the size of each quality, or compare the SteveShines video downloaders.
About 1 minute 34 seconds at 100 Mbps, 16 minutes at 10 Mbps and around 9 seconds at 1 Gbps, assuming you get 85% of the advertised speed. 1 GB is 8,000 megabits, so divide 8,000 by your real speed in Mbps to get seconds.
Plans advertise a maximum. Wi-Fi, other devices on the network and the speed of the server you download from all reduce it. The calculator assumes 85% of the plan; a weak Wi-Fi signal or a busy server can be much slower.
Internet speeds are in megabits per second (Mbps); file sizes and many download windows use megabytes (MB). One byte is 8 bits, so 100 Mbps moves at most 12.5 MB per second.
Roughly 7 GB at a typical 8 Mbps H.264 bitrate, and about half that with HEVC or AV1. Choose “The video length and quality” above for an estimate, or check a stream’s declared qualities with the M3U8 Inspector.
No. The calculator only does arithmetic in your browser.