About the Roman Numerals to Number Converter
This tool converts Roman numerals back into ordinary (Arabic) numbers. It reads the seven Roman letters — I, V, X, L, C, D and M — and applies the standard addition and subtraction rules, so IV becomes 4 and IX becomes 9. Paste a Roman numeral and the decimal value appears instantly.
How Roman Numerals to Number works
Add each symbol’s value, subtracting when a smaller symbol comes before a larger one.
Worked example: XIV = 10 + (5 − 1) = 14
Common uses
- Decoding dates on buildings and monuments.
- Reading chapter and section numbers.
- Understanding clock and watch dials.
- Schoolwork and history research.
Frequently asked questions
Can I convert multiple numbers at once?
Yes — separate each value with a space and every one is converted in order.
Does this run on a server?
No. The conversion happens entirely in your browser, so your data stays private.