Roman to Decimal
Convert a Roman numeral back into a normal number. Local, free, no signup.
Scan to open on your phone
Point your phone camera at the code to open this tool.
Convert a Roman numeral back into a normal number. Local, free, no signup.
How to use Roman to Decimal
- Paste or type your contentThe result appears as you type — there is no submit button.
- Read and copy the resultThe output updates live and the copy button takes it in one click.
Worked example
- MCMLXXXIV
- 1984
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
Roman to Decimal only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- Is case important?
- No, both MCMLXXXIV and mcmlxxxiv work.
- Are subtractive forms allowed?
- Yes, IV, IX, XL and the like are handled correctly.