Roman Numeral Converter

100% Free

Convert between Roman numerals and integers, both ways. Supports up to MMMCMXCIX (3999).

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Convert between Roman numerals and integers, both ways. Supports up to MMMCMXCIX (3999).

This tool is on the roadmap. The interface and full documentation are being built — check back soon, or request priority to bump it up the queue.

Convert integers between binary, octal, decimal, hex — BigInt-precise so values past 2^53 work without rounding. Accepts 0b/0o/0x prefixes.

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Convert between mm, cm, m, km, inches, feet, yards, miles — all 8 units update live as you type into any cell.

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