• Quaternary (base 4) to Base 10
• Quaternary (base 4) to Base 11
• Quaternary (base 4) to Base 12
• Quaternary (base 4) to Base 13
• Quaternary (base 4) to Base 14
• Quaternary (base 4) to Base 15
• Quaternary (base 4) to Base 16
• Quaternary (base 4) to Base 17
• Quaternary (base 4) to Base 18
• Quaternary (base 4) to Base 19
• Quaternary (base 4) to Base 2
• Quaternary (base 4) to Base 20
• Quaternary (base 4) to Base 21
• Quaternary (base 4) to Base 22
• Quaternary (base 4) to Base 23
• Quaternary (base 4) to Base 24
• Quaternary (base 4) to Base 25
• Quaternary (base 4) to Base 26
• Quaternary (base 4) to Base 27
• Quaternary (base 4) to Base 28
• Quaternary (base 4) to Base 29
• Quaternary (base 4) to Base 3
• Quaternary (base 4) to Base 30
• Quaternary (base 4) to Base 31
• Quaternary (base 4) to Base 32
• Quaternary (base 4) to Base 33
• Quaternary (base 4) to Base 34
• Quaternary (base 4) to Base 35
• Quaternary (base 4) to Base 36
• Quaternary (base 4) to Base 4
• Quaternary (base 4) to Base 5
• Quaternary (base 4) to Base 6
• Quaternary (base 4) to Base 7
• Quaternary (base 4) to Base 8
• Quaternary (base 4) to Base 9
• Quaternary (base 4) to Binary (base 2)
• Quaternary (base 4) to Decimal
• Quaternary (base 4) to Duodecimal (base 12)
• Quaternary (base 4) to Hexadecimal (base 16)
• Quaternary (base 4) to Hexatrigesimal (base 36)
• Quaternary (base 4) to Octal (base 8)
• Quaternary (base 4) to Quinary (base 5)
• Quaternary (base 4) to Senary (base 6)
• Quaternary (base 4) to Ternary (base 3)
• Quaternary (base 4) to Hexadecimal (base 16)

• Decimal to Quaternary (base 4)
• Decimal to Quinary (base 5)
• Quaternary (base 4) to Decimal
• Hexatrigesimal (base 36) to Decimal
• Binary (base 2) to Quinary (base 5)
• Decimal to Duodecimal (base 12)
• Quinary (base 5) to Decimal
• Senary (base 6) to Decimal

Quaternary is the base-4 numeral system. It uses the digits 0, 1, 2 and 3 to represent any real number.