Roman numeral converter

Convert a Roman numeral to Arabic, or an Arabic numeral to Roman. Understand Roman numerals letter by letter. See also the calculator to input full mathematical formulas with Roman numbers.


Convert Roman or Arabic:


=

Formula:
 


1 = I 5 = V 10 = X 100 = C 500 = D 1,000 = M
Archaic and large Roman numbers
6 = 50 = 500 = IↃ 1,000 = CIↃ = ↀ 5,000 = IↃↃ = ↁ 10,000 = CCIↃↃ = ↂ 50,000 = IↃↃↃ = ↇ 100,000 = CCCIↃↃↃ = ↈ 500,000 = IↃↃↃↃ 1,000,000 = CCCCIↃↃↃↃ

All number forms might not show up due to missing font support. See special numbers. For easier input, you may type I) for 500, (I) for 1,000 etc.

Fractions
1/2 = S 1/6 = : 1/12 = · 1/24 = Σ 1/48 = 𐅀 1/72 = 𐆓 1/144 = 𐆔 1/288 = 1/1728 = 𐆕

All fractions might not show up due to missing font support. For easier input, you may type . (period) and it will show as · automatically. Similarly, you may write ) for 1/48 and )) for 1/1728.

This converter accepts Arabic and Roman numerals. Roman numerals can be given in conventional, alternative and archaic forms. The converter does not verify the Roman number you type is in a commonly used format. Arabic numbers are accepted in range 1…4,999,999. For larger numbers use the calculator.

Calculator for Roman numerals

Roman numerals complete list

©Tuomas Salste