Complete Numeral Systems Conversion Index

A comprehensive guide to all supported number bases and numeral systems. Click any link below to perform the conversion instantly.

This page is designed for quick reference, listing all supported number bases and providing a direct link for every possible conversion pair.

20 Supported Numeral Systems

Decimal (Base 10)

The standard base-10 numeral system used worldwide, employing the digits 0 through 9.

Binary (Base 2)

A base-2 numeral system, fundamental to digital computing, using only the digits 0 and 1.

Octal (Base 8)

A base-8 numeral system, often used in computer science as a compact representation of binary numbers.

Hexadecimal (Base 16)

A base-16 numeral system, widely used in computing, which uses the digits 0–9 and the letters A–F.

Roman Numerals (rom)

An ancient numeral system of Rome, using combinations of letters (I, V, X, L, C, D, M) to represent values. The system is additive and subtractive.Note: Ancient system used in Europe.

Ternary (Base 3)

A base-3 numeral system, using the digits 0, 1, and 2.

Quaternary (Base 4)

A base-4 numeral system, sometimes used in digital logic.

Quinary (Base 5)

A base-5 numeral system, potentially related to counting on one hand.

Senary (Base 6)

A base-6 numeral system, also known as heximal.

Septenary (Base 7)

A base-7 numeral system.

Nonary (Base 9)

A base-9 numeral system.

Undecimal (Base 11)

A base-11 numeral system, using the digits 0-9 and one letter (typically A).

Duodecimal (Base 12)

A base-12 numeral system, historically used for measurements (e.g., inches in a foot) and uses two additional symbols (A, B or T, E).

Vigesimal (Base 20)

A base-20 numeral system, famously used by the Mayan civilization.

Sexagesimal (Babylonian) (Base 60)

A base-60 numeral system, originating from ancient Sumer and Babylonia, still used for time (minutes, seconds) and angles.Note: Ancient system; used for time/angles today.

Septemvigesimal (Base 27)

A base-27 numeral system, using all 26 letters and 0-9 (with some omission/overlap depending on convention).

Trigesimal (Base 30)

A base-30 numeral system.

Novemdecimal (Base 19)

A base-19 numeral system.

Base 36 (Base 36)

A base-36 system using the 10 digits (0-9) and 26 letters (A-Z) for short alphanumeric identifiers.

Base 64 (Base 64)

A base-64 system using 0-9, A-Z, a-z, and two additional symbols, often used for encoding binary data (e.g., Base64 encoding).

All Possible Conversions (380)

Click a conversion link below to perform the calculation instantly.

* The full list of supported number systems is sourced directly from the application’s core data, ensuring that all conversion pairs listed here are accurate and functional on the main converter page. The system Decimal (Base 10) serves as the canonical intermediate base for conversion.