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This site uses binary prefixes, as kilo, mega, etc. are and always have been powers of 10. Binary prefixes (as described by SI) are powers of 2. That means:

• 1 kilo = 1 × 10³ = 1000
• 1 kibi = 1 × 2¹⁰ = 1024
• 1 Mega = 1 × 10⁶ = 1000000
• 1 Mebi = 1 × 2²⁰ = 1048576

1 Byte = 8 bit. b = bit, B = Byte (lower / uppercase)