Roman Numeral Converter

Numbers to Roman numerals and back — instant, with validation.

FREE TOOL · WORKS OFFLINE · NO SIGN-UP
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Current conversion
2026 = MMXXVI

Type in either box — the other updates instantly. Roman numerals are checked against the standard form, so mistakes like IL or IIII are flagged.

📋 Roman Numeral Quick Table

SymbolIVXLCDM
Value1510501005001000
SubtractiveIVIXXLXCCDCM—
Value494090400900—

🏛️ How to Use This Roman Numeral Converter

  1. 1.Type a number. Any whole number from 1 to 3999 is converted to its Roman numeral instantly in the second box.
  2. 2.Or type a Roman numeral. Enter it in the lower box (lowercase works too) and the number appears above.
  3. 3.Watch for validation. Non-standard forms like IL, VV or IIII are flagged, and the converter suggests the correct standard form.
  4. 4.Use the quick table. The seven symbols and the six subtractive pairs (IV, IX, XL, XC, CD, CM) cover every conversion.

❓ FAQ

How do you write 2026 in Roman numerals?

2026 is MMXXVI: MM = 2000, XX = 20 and VI = 6. Build the number place by place — thousands, then hundreds, then tens, then ones — and join the parts together.

Why is 49 written as XLIX and not IL?

Roman numerals only allow a smaller numeral to subtract from the next two sizes up: I can precede V or X, X can precede L or C, and C can precede D or M. So 49 = XL (40) + IX (9) = XLIX. IL is not a valid standard form.

What is the largest number this Roman numeral converter supports?

3,999 (MMMCMXCIX). Standard Roman numerals have no symbol for 5,000 or 1,000,000 and M can repeat at most three times, so 3,999 is the largest number in the classic system without a vinculum (overline).

Is this Roman numeral converter free?

Yes — 100% free, no sign-up. The conversion happens entirely in your browser; nothing is uploaded, saved or tracked.

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