• Base 11 to Base 31 Conversion Table
• Base 8 to Base 23 Conversion Table
• Base 27 to Base 34 Conversion Table
• Base 9 to Base 27 Conversion Table
• Binary (base 2) to Base 2 Conversion Table
• Base 15 to Hexadecimal (base 16) Conversion Table
• Quinary (base 5) to Base 27 Conversion Table
• Base 12 to Hexadecimal (base 16) Conversion Table

The vigesimal or base 20 numeral system is based on twenty (in the same way in which the decimal numeral system is based on ten).

The duodecimal system (also known as base 12 or dozenal) is a positional notation numeral system using twelve as its base.