The conversion
Divide the KB value by 1,000 in decimal units. 1,500 KB is 1.5 MB. The binary equivalent is KiB to MiB, where you divide by 1,024.
Which system to use
Use decimal KB, MB, and GB when you are matching a label that counts by thousands. Use binary KiB, MiB, and GiB when a spec counts by 1,024. Do not add the two together as if they were the same unit.