Roman Numeral Converter — Number ⇄ Roman (1–3999) Free
Free two-way Roman numeral converter. Convert any number from 1 to 3999 into Roman numerals and Roman numerals back into numbers, live as you type, with validation.
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TL;DR: Free two-way Roman numeral converter. Convert any number from 1 to 3999 into Roman numerals and Roman numerals back into numbers, live as you type, wi…
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A free two-way Roman numeral converter. Turn any number from 1 to 3999 into Roman numerals, and Roman numerals back into numbers — live as you type, with validation that rejects impossible forms.
The seven Roman numerals
- I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000.
- A smaller value before a larger one is subtracted: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900.
- Otherwise values add up: MMXXIV = 2024. Standard Roman numerals run from 1 to 3999.
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