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Video Files - Formulas

File size = bitrate * number of minutes * .0075
Bitrate = file size / (number of minutes * .0075)
Number of minutes = file size / (bitrate * .0075)

otherwise

GB = mbps * minutes * .0075
mbps = GB / (minutes * .0075)
minutes = GB / (mbps * .0075)

NOTE: The .0075 is derived from the following:

As there are 8 bits per byte, it is required to device by 8 to determine the bits.
To convert the number of minutes to seconds, multiply by 60.
Divide by 1,000 to to convert megabits (Mb) to megabytes (MB), or megabytes to gigabytes.

1/8 * 60 / 1000 = 0.0075.