Free Roman Numeral Converter
Convert any number from 1 to 3999 into Roman numerals, or a Roman numeral back into a number, with validation.
Roman Numeral Converter: Convert any number from 1 to 3999 into Roman numerals, or a Roman numeral back into a number, with validation. It is free, needs no sign-up and runs in your browser. How to use it: 1) type a number or a Roman numeral; 2) the tool detects which one you entered; 3) copy the result.
How Roman numerals work
Letters I, V, X, L, C, D and M stand for 1, 5, 10, 50, 100, 500 and 1000. A smaller letter before a larger one is subtracted, as in IV = 4.
About this tool
The Roman Numeral Converter is built and maintained by the Hayyat Networks team, a digital marketing, SEO and web development agency working with businesses in New York and Lahore since 2016. It is part of our free Everyday Tools collection.
- Last reviewed
- CostFree, no sign-up
- Where it runsRuns in your browser
- Checking resultsResults follow the steps shown on this page.
- PrivacyIt runs entirely in your browser: what you type stays on your device and is never sent to us.
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Link to this tool
Free to share in your blog, course notes or resource list. Copy the link below:
<a href="https://hayyatnetworks.com/free-tools/everyday-tools/roman-numeral-converter/">Roman Numeral Converter</a> by Hayyat NetworksRoman Numeral Converter FAQs
What is 2026 in Roman numerals?
MMXXVI.
Why is 3999 the maximum?
Standard numerals have no single letter above M (1000), so 3999 (MMMCMXCIX) is the largest regular value.
Is IIII valid?
Clock faces use it, but the standard form is IV.
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