Roman Numeral Converter
5 toolsConvert numbers to and from Roman numerals.
Runs in your browser — your files and text stay on your device
A complete converter toolkit — length, weight, temperature, area, volume, speed, data storage, time, and pressure units, plus number bases, CSV/JSON, Roman numerals, and cooking measurements. All in one place, entirely client-side.
MCMXCIVHow to use this tool
- 1Choose a direction.
- 2Enter a number (1–3999) or a Roman numeral.
- 3The converted value appears instantly.
Frequently asked questions
Why is 3999 the maximum?
Standard Roman numerals don't have symbols for values 4000 and above without special notation.
Does it validate Roman numerals strictly?
Yes — it checks the input round-trips to the same numeral, catching invalid forms like "IIII" or "VX".