Steemit API. The formula of the bandwidth?

Hi, there!

A few months ago I began to learn the javascript. Steemit was an ideal platform for experiments.

During this time I learned a lot of new and interesting things. This is really an exciting activity. Now I can collect and analyze data directly from the blockchain. I can create my own client for the Steemit and much more.

But I ran into some problems. I need your help, guys.

There - https://steemd.com/@fshzzl - I see my bandwidth. But in blockhain I did not find the exact meaning of this function.

Is there a special formula for calculating my bandwidth?

Thanks!