Calculators & Generators

Roman Numeral Converter

Type a number or a Roman numeral to convert it.

By TheCalcTools Updated Formula checked and tested
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Roman Numeral Converter by TheCalcTools

How the Roman Numeral Converter works

Roman numerals use I = 1, V = 5, X = 10, L = 50, C = 100, D = 500 and M = 1,000. A smaller symbol before a larger one is subtracted, but only in six pairs: IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900).

The converter writes numbers greedily from the largest value down, and accepts only numerals in this standard form, so non-standard spellings such as IIII or IC are rejected.

Worked example

1994 = M + CM + XC + IV = MCMXCIV.

Frequently asked questions

How do you write 2026 in Roman numerals?

MMXXVI: 1000 + 1000 + 10 + 10 + 5 + 1.

Why does it stop at 3,999?

Larger numbers need a bar over the symbols (multiplying by 1,000), which is not part of the standard modern form.

Sources and further reading

Number Base Converter (Binary, Octal, Decimal, Hex)Type a number in any base to see it in binary, octal, decimal and hexadecimal Case Converter (Upper, Lower, Title, camelCase)Paste text and tap a case style Date CalculatorAdd time to a date, take time away from it, or find how many days lie between two dates

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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.