What does this tool do?
| Direct answer | Roman to Numbers sums letter values, subtracting any smaller value before a larger one. |
| Key fact | XIV = 10 + (5 − 1) = 14 — the I before V subtracts. |
| Processing | Runs locally in your browser; no data is sent to a server. |
How to use
- Type Roman numerals like XIV.
- Click Convert.
- See the number.
Example
Input
XIV
Output
14
Who is this for?
This tool was built for people who need a fast answer in the browser — no install, no account, no data leaving the device.
Programmers working with low-level data, computer science students, and electronics hobbyists reading registers — anyone tired of converting number bases by hand.
Frequently asked questions
Is lowercase accepted?
Yes — xiv and XIV both convert.
What is MMMCMXCIX?
3999, the largest standard Roman numeral.
Are non-standard forms like IIII accepted?
No — only valid letter sequences parse.