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Rhad ac am ddim Roman Numeral Converter

Convert numbers to Roman numerals and back. Supports 1–3999 with full subtractive notation.

Runs in your browserNo sign-up, no pop-upsNid oes angen mewngofnodiAm ddim am byth

Decimal number (1–3,999,999)

Roman numeral

MMXXIV

Common values

Roman numeral rules: I=1, V=5, X=10, L=50, C=100, D=500, M=1000.

Subtractive notation: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900. Standard numerals max out at MMMCMXCIX (3999).

Vinculum: a bar over a numeral multiplies it by 1000 (V̅ = 5000, X̅ = 10000, M̅ = 1,000,000), extending the range to 3,999,999.

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✓Open and ad-supported, with no tracking

✓Loads fast, with no installation needed

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