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Undecimal (Positional systems), numerals

The undecimal (base-11) positional notation system is based on the number eleven, rather than ten as in decimal or eight in octal and so on. It is not a commonly used system. Undecimal requires eleven symbols representing the decimal numbers 0 through 10. For example, if the symbol for 10 were 'A', the decimal numbers 0 to 24 in undecimal would be: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 1A, 20, 21, 22. The undecimal number 1A3 would be 234 in decimal.

Type the number of Undecimal you want to convert in the text box, to see the results in the table.

100 Undecimal
is equal to
79

Positional systems

Numeral systems

Languages

  • English

    one hundred twenty one

  • German

    hunderteinundzwanzig

  • Spanish

    ciento veintiuno

  • Swedish

    etthundratjugoett

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