Description of problem: Conversions' results from data-storage values displayed as 1024-blocks into values in bits, do not match real sizes.

Version-Release number of component: coreutils-8.29-7.fc28.x86_64

How reproducible:
$ LANG=C df -P
Filesystem                    1024-blocks  Used    Available Capacity Mounted on
(...)
/dev/mapper/fedora--live-root 153761232    6048548 139832392 5%       /

Actual results: 1024 * 153 761 232 = 157 451 501 568 bits; result does not match the real size which is illustrated as output from the 'lsblk' command.

Expected results: df's outputs to be similar to the ones resulting from the 'lsblk' command – here 161 052 884 992 bits–

Additional info: 
$ lsblk -b
NAME                  MAJ:MIN RM   SIZE          RO TYPE MOUNTPOINT
(...)
  ├─fedora--live-root 253:0    0   161052884992  0  lvm  /