Bandwidth is the measure of total amount of data that is transferred from one point to another point over network connection.To define bandwidth mathematically one can say that, if your website is of 10 KB and the total number of hits is 20 per day, then your bandwidth would be 10 x 20 bites and if you want a monthly report multiple it with 30. Bandwidth is sometimes measured in bytes also.

8 bits = 1 byte and 1024 bytes = 1 Kilobytes