How do you calculate megabytes?

A bit is the smaller unit in computer science and can only have two values : 0 or 1.

A byte is a set of 8 bits.

A MegaByte can have 2 meanings:

using the decimal way: 1 Mb = 10^6 Bytes (1 000 000)

using the binary way: 1 Mb = 2^20 Bytes (1 048 576)