that is what rclone uses https://rclone.org/docs/#size-option
"Options which use SIZE use KiB (multiples of 1024 bytes) by default. However, a suffix of B for Byte, K for KiB, M for MiB, G for GiB, T for TiB and P for PiB may be used. These are the binary units, e.g. 1, 210, 220, 2**30 respectively."
Sorry. Googled a bit prior to posting and saw mebibyte but didn't deem it relevant from a quick glance. Feel stupid now, flagged the post for deletion. With that said - a more regular well known format would not hurt...