Base 18 or octodecimal is base on eighteen and require 18 different symbols (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G and H. Plural name is base-18.

Input | Output | Table | |
---|---|---|---|

24 base-10 |
11000 base-2 |
base-10 to base-2 | |

24 base-2 |
0 base-10 |
base-2 to base-10 | |

24 base-3 |
2 base-10 |
base-3 to decimals | |

24 base-10 |
30 base-8 |
base-10 to base-8 | |

24 base-10 |
44 base-5 |
base-10 to base-5 | |

24 base-10 |
33 base-7 |
decimals to base-7 | |

24 base-5 |
14 base-10 |
base-5 to decimals | |

24 base-10 |
20 base-12 |
decimals to base-12 | |

24 base-10 |
120 base-4 |
decimals to base-4 | |

24 base-10 |
18 base-16 |
base-10 to base-16 |

Base-18 can convert to other units, such as base-10, base-11, base-12, base-13, base-14, base-15, base-16, base-17, base-19, base-2, base-20, base-21, base-22, base-23, base-24, base-25, base-26, base-27, base-28, base-29, base-3, base-30, base-31, base-32, base-33, base-34, base-35, base-36, base-4, base-5, base-6, base-7, base-8, base-9, binary, decimal, hexadicimal, octal and more. You can find the reference table below:

Base-18 also canvert from other unit such as base-10, base-11, base-12, base-13, base-14, base-15, base-16, base-17, base-19, base-2, base-20, base-21, base-22, base-23, base-24, base-25, base-26, base-27, base-28, base-29, base-3, base-30, base-31, base-32, base-33, base-34, base-35, base-36, base-4, base-5, base-6, base-7, base-8, base-9, binary, decimal, hexadicimal, octal and more. You can find the reference table below:

The undecimal (base-11) positional notation system is based on the number eleven. The undecimal requires eleven symbols 0-9 and A.

Duodecimal system (also known as base-12 or dozenal) is a positional notation numeral system using twelve as its base. The duodecimal requires twelve symbols such as: 0, 1, 2, 3 , 4, 5, 6, 7, 8, 9 , A and B.

Tridecimal, tredecimal, triskadecimal or base-13 is a positional numeral system with thirteen as its base. It uses 13 different digits for representing numbers. The digits for base 13 could be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, and C.

Tetradecimal (base-14) positional notation system is based on the number fourtheen. The tetradecimal requires fourteen symbols such as : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D.

Pentadecimal (base-15) positional notation system is based on the number fifteen. The pentadecimal requires fifteen symbols such as: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E.

Base 17 or septendecimal is a positional numeral system with a radix of 17. The symbol used in this system are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F and G.

Base 18 or octodecimal is base on eighteen and require 18 different symbols (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G and H.

Base 19 or nonadecimal is base on nineteen and require 19 different symbols (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H and I.

The vigesimal or base 20 numeral system is based on twenty. The twenty symbols used are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I and J.

Base 21 or unovigesimal numeral system is based on twenty-one. The twenty one symbols used are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, J and K.

Base 22 or duovigesimal numeral system is based on twenty-two. The twenty two symbols used are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, J, K and L.

Base 23 or triovigesimal numeral system is based on twenty-three. The twenty three symbols used are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, J, K, L and M.

The base-24 system is a numeral system with 24 as its base. The symbols used in this system are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, J, K, L, M, and N.

The base-25 system is a numeral system with 25 as its base. The symbols used in this system are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, J, K, L, M, N and O.

A hexavigesimal numeral system has a base of twenty-six. The symbols used in this system are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O and P.

A septemvigesimal numeral system has a base of twenty-seven. The symbols used in this system are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P and Q.

The base 28 numberal system is based on twenty-eight and uses 28 different symbols ( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q and R.)

The base 29 numberal system is based on twenty-nine and uses 29 different symbols ( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R and S.)

Ternay or trinary is the base-3 numeral system. Ternary requireds only three symbols: 0, 1 and 2.

Trigesimal or base 30 is a positional numeral system using 30 as the radix. Digits in this base can be represented using the Arabic numerals 0-9 and the Latin letters A-T.

Unotrigesimal or base 31 is a positional numeral system using 31 as the radix. Digits in this base can be represented using the Arabic numerals 0-9 and the Latin letters A-U.

Duotrigesimal or base-32 is a numeral system with 32 as its base. Digits in this base can be represented using Arabic numerals 0-9 and the Latin letters A-V.

Base 33 numeral system is based on 33 different symbols (number 0-9 and letter A-W).

Base 34 numeral system is based on 34 different symbols (number 0-9 and letter A-X).

Base 35 numeral system is based on 35 different symbols (number 0-9 and letter A-Y).

Base 36 or hexatridecimal is a positional numeral system using 36 as the radix. The choice of 36 is convenient in that the digits can be represented using the Arabic numerals 0-9 and the Latin letters A-Z.

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

Quinary (base-5) is a numeral system with five as the base. The base five is started from 0-4.

The binary numeral system, or base-2 number system, represents numeric values using two symbols: 0 and 1.

The decimal numeral system (also called base ten or occasionally denary) has ten as its base.

Hexadecimal (also base 16, or hex) is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0-9 to represent values zero to nine, and A,B,C,D,E,F.