The bit rate of a file tells us how many bits of data are processed every second. Bit rates are usually measured in kilobits per second (kbps).
The bit rate is calculated using the formula:
Frequency × bit depth × channels = bit rate
44,100 samples per second × 16 bits per sample × 2 channels = 1,411,200 bits per second (or 1,411.2 kbps)
A four-minute (240 second) song at this bit rate would create a file size of:
1,411,200 × 240 = 338,688,000 bits (or 40.37 megabytes)