FFFF in Decimal
Hexadecimal FFFF equals 65535 in decimal.
Why this number matters: 65535 is the maximum unsigned 16-bit value (0xFFFF) and the highest TCP/UDP port number.
FFFF in all number bases
Decimal65535
Hexadecimal0xFFFF
Binary1111 1111 1111 1111
Octal177777
Try another value
Edit this value or switch its base. Your changes are calculated in your browser with exact integer arithmetic.
Input base:
Decimal
65535Hex
0xFFFFBinary
0b1111111111111111Octal
0o177777How ffff converts from hexadecimal to decimal
Multiply each digit by 16 raised to its position (starting at 0 from the right), then add the results:
F× 163 = 15 × 4096 = 61440
F× 162 = 15 × 256 = 3840
F× 161 = 15 × 16 = 240
F× 160 = 15 × 1 = 15
Sum: 65535
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