numfmt

Convert numbers to and from human-readable strings. More information: https://www.gnu.org/software/coreutils/manual/html_node/numfmt-invocation.html.

Convert 1.5K (SI Units) to 1500:

numfmt --from={{si}} {{1.5K}}

Convert 5th field (1-indexed) to IEC Units without converting header:

ls -l | numfmt --header={{1}} --field={{5}} --to={{iec}}

Convert to IEC units, pad with 5 characters, left aligned:

du -s * | numfmt --to={{iec}} --format={{"%-5f"}}