Converters
Roman Numerals Converter
Convert between Arabic numbers (1–3999) and Roman numerals.
Free to use — no sign-up or login.
Roman numerals on this page cover 1 through 3999. The year 2026 is MMXXVI. Subtractive pairs are IV, IX, XL, XC, CD, and CM.
Other bases, such as binary and hex, are on the base converter. Roman letters are not a base-16 encoding.
Subtractive pairs
I before V or X, X before L or C, and C before D or M. The page accepts those standard pairs and rejects other arrangements such as IC.
What is left out
There is no zero, no fraction, and no bar over a letter for thousands beyond 3999. Values outside 1–3999 are refused.
Worked example: 2026
From Arabic to Roman, 2026 is MMXXVI. From Roman to Arabic, MMXXVI is 2026.
\[ 2026=\mathrm{MMXXVI} \]
Frequently asked questions
What is 2026 in Roman numerals?
MMXXVI.
What is MMXXVI in Arabic numbers?
2026.
Which subtractive pairs are allowed?
IV, IX, XL, XC, CD, and CM.
Can I enter 0?
No. The range is 1 through 3999.
Can I enter a fraction?
No. Roman output here is a whole number in that range.
References
Assumptions and limitations
Integers from 1 to 3999 only. No zero, no fractions, and no vinculum for larger numbers.