Custom format for displaying bytes as kb, mb, gb or tb.

Response to a few places on the internet: https://productforums.google.com/forum/#!topic/docs/x_T_N-yRUYg And here: https://stackoverflow.com/questions/1533811/how-can-i-format-bytes-a-cell-in-excel-as-kb-mb-gb-etc

Here is one that I have been using:

[<1000000]0.00," KB";[<1000000000]0.00,," MB";0.00,,," GB"