4095
For anything more complex I would use the standard 'calculator' provided with Windows, click on 'View' then 'Scientific'. The radio buttons let you select Decimal, Hex, Octal or Binary for the currently displayed number.
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The binary equivalent of the hexadecimal number EF16 is 1110111100010110.
hex =7
1101111010101101 in binary is equal to DEAD in hexadecimal.
1100010000111010
111111 in binary is 255 in decimal which is FF in hexadecimal (i.e. 15 units and 15 16s)