Not sure what you mean by kbs!?

It depends on many things such as how long the album runs, what bit-rate it was encoded at, etc.

Here's a rough guide as far as bit-rate encoding goes; these are based around 1 minute & are approximate:
128 kbps = 0.9 MB
160 kbps = 1.1 MB
192 kbps = 1.3 MB
256 kbps = 1.8 MB
320 kbps = 2.3 MB

So then multiply those by the no. of mins you think your album should run for. eg: a 60 min album at 160 kbps should be about 66 MB in size, or encoded at 192 kbps would be aound 78 MB in size.
Or if the album runs for 40 mins (similar to older vinyl record albums) then at 160 kbps would be around 44 MB in size. Or encoded at 320 kbps would be around 92 MB in size.

I hope that's what you meant.