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(length of video in seconds * kbps) / 8
So if you have a 700kbps video that is 20 minutes long (1200 seconds):
(1200 * 700) / 8 = 105,000 Kilobytes
Note the exact number can vary depending on overhead like meta data, variable bitrate video varies too as will the method used for variable bitrate like 2 pass encoding.