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Roman numbers

Use this tool to convert from decimal numbers to Roman numerals and the other way around.
To convert more numbers at once, they need to be separated by spaces. The biggest number to convert is 3999.

Conversion:
Background

Roman numerals, the numeric system in ancient Rome, uses combinations of letters from the Latin alphabet to signify values.
Roman numerals, as used today, are based on seven symbols.

SymbolValue
I1
V5
X10
L50
C100
D500
M1000

Roman numerals are formed by combining symbols together and adding the values. Generally, symbols are placed in order of value, starting with the largest values. When smaller values precede larger values, the smaller values are subtracted from the larger values, and the result is added to the total.

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