data size converter 2
https://fun-wiki.win/index.php/Understanding_Data_Storage:_How_Many_GB_in_a_ZB_and_Why_It_Matters
When you're moving files between devices or wondering if that 4K video will fit on a flash drive, a data size converter takes the guesswork out of it. Instead of mentally juggling kilobytes, megabytes, and gigabytes, you simply punch in the number and see exactly how many gigabytes are in 5000 megabytes or how many terabytes fit in a petabyte. It's a straightforward tool that keeps you from accidentally buying a drive that's too small or misjudging your cloud storage needs.