If you think little bit about it, it is not too much

1 000 000 000 bytes is about 1 000 000 kilobytes, exactly 976 562.5 kb
1 000 000 000 bytes is about 1000 megabytes, exactly 953.67 mb
and at the end 1 000 000 000 bytes is about 1 gigabytes, exactly 0.9313 gb

Here is fine unit converter/bit calculator which you can use to convert between bytes, kilobytes, gigabytes...

One more interesting website. It is text to binary converting tool that converts normal text to binary code.