Convert a Roman numeral back into a normal number. Local, free, no signup.

How to use Roman to Decimal

  1. Paste or type your contentThe result appears as you type — there is no submit button.
  2. 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.
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