hard drive - Why do Disk utility and Gparted show different information for the same hdd(s)?

Gparted and Disks utility give me different sizes for my hard drive and its partitions. Is there a reason, for both programs, to list different information or is it an error?

GParted & Terminal output: sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL

dev/sda = 298.1 Gib
/dev/sda3 = 191.40 GiB
/dev/sda4 = 92 GiB
/dev/sda5 = 88.40 GiB
/dev/sda6 = 3.60 GiB

Disks Utility output

dev/sdb = 320 Gib
/dev/sda3 = 206 GiB
/dev/sda4 = 99 GiB
/dev/sda5 = 95 GiB
/dev/sda6 = 3.9 GiB

The result shown by sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL performs calculations using the binary prefix i.e. multiples of 1024 (which is 2¹⁰). So 500107862016 bytes would be equal to 465.76 GB or approximately 466 GB. (You can use -b switch to print in bytes instead of human readable as sudo lsblk -b -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL.)

Calculation:

500107862016 bytes = (500107862016 / (1024 ^ 3)) GB = 465.76 GB

While Disks Utility uses decimal prefix for calculation so expressed as multiples of 1000. So 500107862016 bytes here would mean 500.11 GB or 500 GB approx.

Calculation:

500107862016 bytes = (500107862016 / (1000 ^ 3)) GB = 500.11 GB