Numbers to Roman Numerals Converter Online Tool


Number

Roman Numeral

About Numbers to Roman Numerals Converter Online Tool:

This online Roman Numerals to Numbers Converter helps you to convert one Roman Numeral into a number (base 10). Put Roman Numeral into the first textbox, the number result will show in the second textbox.

Roman Numerals:

Roman numerals is invented by ancient Rome, it use letters from Latin ("I" for "1", "V" for "5", "X" for "10", "L" for "50", "C" for "100", "D" for "500", "M" for "1000") to represent numbers. Roman numerals is still widely used in academic paper chapter numbering system.

comic numbers to roman numerals

How to convert from Numbers to Roman Numerals?

  1. Step 1: Remember the value combination list ["M": 1000, "CM": 900, "D": 500, "CD": 400, "C": 100, "XC": 90, "L": 50, "XL": 40, "X": 10, "IX": 9, "V": 5, "IV": 4, "I": 1], Remember its order and each value.

  2. Step 2: From left to right, subtract as much large combination as you can, unless it's not smaller than 0.

Example 1: Convert Number "424" to Roman Numeral:

424 = 400 + 10 + 10 + 4 = CD + X + X + IV = CDXXIV

Example 2: Convert Number "2019" to Roman Numeral:

2019 = 1000 + 1000 + 10 + 9 = M + M + X + IX = MMXIX

Numbers to Roman Numerals conversion table:

Numbers Roman Numerals Numbers Roman Numerals
1I21XXI
2II22XXII
3III23XXIII
4IV24XXIV
5V25XXV
6VI26XXVI
7VII27XXVII
8VIII28XXVIII
9IX29XXIX
10X30XXX
11XI31XXXI
12XII32XXXII
13XIII33XXXIII
14XIV34XXXIV
15XV35XXXV
16XVI36XXXVI
17XVII37XXXVII
18XVIII38XXXVIII
19XIX39XXXIX
20XX40XL

More information:

Wikipedia (Roman numerals): https://en.wikipedia.org/wiki/Roman_numerals

Convert Numbers to Roman Numerals with Python:

def transform_number_to_roman_numeral(number):
    roman_value_list = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1]
    roman_char_list = ["M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"]
    res = ''
    for i in range(len(roman_value_list)):
        while number >= roman_value_list[i]:
            number -= roman_value_list[i]
            res += roman_char_list[i]
    return res


number_input = 987
roman_numeral_output = transform_number_to_roman_numeral(number_input)
print('number {0} equal to:{1}'.format(number_input, roman_numeral_output))

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number 987 equal to:CMLXXXVII

Convert Numbers to Roman Numerals with Java:

public class NumberConvertManager {
    public static String transform_number_to_roman_numeral(int number) {
        int[] roman_value_list = new int[]{1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
        String[] roman_char_list = new String[]{"M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"};
        StringBuilder res = new StringBuilder();
        for (int i = 0; i < roman_value_list.length; i += 1) {
            while (number >= roman_value_list[i]){
                number -= roman_value_list[i];
                res.append(roman_char_list[i]);
            }
        }
        return res.toString();
    }

    public static void main(String[] args) {
        int number_input = 987;
        String roman_numeral_output = transform_number_to_roman_numeral(number_input);
        System.out.println("number " + number_input + " equal to:" + roman_numeral_output);
    }
}

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number 987 equal to:CMLXXXVII