## Roman Numerals, Binary, Octal, Hex to Decimal and Other Radix Conversion

This conversion page only works with integer numbers. Fractions are not supported. You computer needs to be able to display unicode characters.
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## Decimal numbers

The decimal numerals we use every day were invented in India. They were brought to Europe by Arab merchants and became known in the West as Arabic numerals. The correct name for the numbers we use is Hindu-Arabic.

The Hindu-Arabic system consists of 10 digits from 0 to 9. These ten digits are written differently in various languages though.

Units: Common decimal number (Hindu-Arabic)  / Devanagari number (India and Nepal)  / Eastern Arabic number (Middle East)  / Eastern Asian number (China, Japan, Korea)  / Thai number  / Khmer number  / Tamil number (Singapour, Sri Lanka, Malaysia, South Africa)
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## Roman numerals

Roman numerals originated in Ancient Rome and were used for many centuries (up to 14th century) all across the Europe. They are still occasionally used nowadays. The numbers in traditional Roman system are represented by Latin letters I, V, X, L, C, D, and M. Each letter could only be repeated no more than 3 times in a row. It means that the maximum number that one could write was MMMCMXCIX which was equal to 3999.

To represent larger numbers several modifications of Roman systems were used. One example of those is vinculum where adding a horizontal line over a number multiplies it by 1000. Adding additional vertical lines to the left and right of the number raises multiplier to a million.

Another system was called apostrophus which originates from Etruscan numerals. In this system 500 was written as and 1000 as C|Ɔ. Extra Roman parentheses C and Ɔ made the number 10 times bigger.

To enter a digit with overscore type the digit followed by _ symbol. E.g. M_ will be understood as . You may use usual parentheses instead of Roman. E.g. (|) instead of C|Ɔ.

Units: Roman numeral (vinculum)  / Roman numeral (apostrophus)
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## Greek numerals

Greek numerals are decimal, but different letters are used to represent numbers from 1 to 9, from 10 to 90, and from 100 to 900. A special character keraia (ʹ) is added in the end to distinguish a number from a word. A left keraia (͵) added before a letter is used to denote thousands. The numbers one million and above cannot be written this way.
 Greek numeral
Units: Greek numeral
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The radix or base of a numeral system is the number of unique digits (inclusing zero) that are used in a positional numeral system. Our common decimal system we use every day has radix 10. The systems with bases 2 (binary), 8 (octal) and 16 (hexadecimal) are often used in computing.
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These numerals are rarely used.

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Did you know?
In medieval and ancient times usage of Roman numerals was not consistent. For example, you could find both VIII and IIX to designate eight even in the same document.
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? Not a decimal integer. ? Not a valid Roman numeral ? Not a valid binary number. Please only use digits 0 and 1 ? Not a valid Greek numeral ? Not a valid undecimal number. Please only use digits 0 to 9 and letter A ? Not a valid senary number. Please only use digits 0 to 4 ? Not a valid quaternary number. Please only use digits 0 to 3 ? Not a valid octal number. Please only use digits from 0 to 7 ? Not a valid ternary number. Please only use digits 0 to 2 ? Not a valid duodecimal number. Please only use digits 0 to 9 and letters A and B ? Not a correct number. ? Not a valid hexadecimal number. Please only use digits 0 to 9 and letters from A to F