Storage makers use decimal: 1 KB = 1,000 bytes. Operating systems traditionally use binary: 1 KiB = 1,024 bytes. That is why a "1 TB" drive shows about 931 GiB in Windows. Use the toggle above to switch KB/MB/GB between the 1000 and 1024 definitions.
Bits vs bytes
Network speeds are quoted in bits per second (Mbps), while file sizes use bytes. There are 8 bits in a byte, so divide by 8 to go from bits to bytes.