YoutubeFileSize

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Measuring File Size of YouTube Video

The "Normal Quality (NQ)" YouTube encoding is around 300Kb/s combined for audio and video. So if the video is 10 mins long , you can figure out that the file size will be around 22MB or so.

Here's how you do it.
First calculate the length in secs. A 10 min video is 600 seconds.

Mulitply that by the bitrate in Kilobits per second (300 in the case of NQ).
600x300= 180000

Next divide the result by 8 to convert it to KiloBytes
180000 / 8= 22500

Divide that result by 1024 (how many KiloBytes are in a MegaByte)
22500 / 1024 = 21.97

~22MB

Obvisously the High Definition (HD) and High Quality (HQ) encodings are encoded at much higher bitrates (~2000Kb/s and ~600Kb/s respectively).


Now
The "high quality (HQ!)" YouTube encoding is around 600Kb/s combined for audio and video. So if the video is 10 mins long , you can figure out that the file size will be around 44MB or so.

Mulitply that by the bitrate in Kilobits per second (e.g. 600Kb/s in the case of HQ).
600x600= 360000

Next divide the result by 8 to convert it to KiloBytes
360000 / 8= 45000

Divide that result by 1024 (how many KiloBytes are in a MegaByte)
45000 / 1024 = 43.94

~44MB