Roman Numeral Converter

Convert numbers to Roman numerals or decode Roman numerals into numbers, with the breakdown shown.

FreeNo sign-upRuns in your browserMobile-friendly

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What does the Roman Numeral Converter do?

Roman numerals combine seven symbols: I (1), V (5), X (10), L (50), C (100), D (500) and M (1,000). Subtractive pairs like IV (4), IX (9), XL (40) and CM (900) avoid repeating a symbol four times. The converter detects whether you typed digits or numerals and converts in the right direction.

It validates numerals strictly, rejecting non-standard forms like IIII or VX, and explains each part of the result.

How to use the Roman Numeral Converter

  1. Type a number from 1 to 3,999, or a Roman numeral.
  2. Read the conversion and breakdown.
  3. Copy the result.

Examples

Year

2026 → MMXXVI (M + M + X + X + V + I).

Decode

MCMXCIV → 1,994.

Common use cases

  • Reading dates on buildings and films
  • Book chapters and outlines
  • Watch faces, tattoos and designs
  • History and maths homework

Features and benefits

  • Private by design — your data is processed on your device and never uploaded.
  • Free with no account, no watermark and no usage limits.
  • Works on phones, tablets and desktops in any modern browser.

Limitations to know

  • Standard numerals stop at 3,999 (MMMCMXCIX).

Frequently asked questions

Why is 4 written IV?

Placing a smaller numeral before a larger one subtracts it.

Is there a zero?

No, Roman numerals have no zero.

Why is IIII on some clocks?

It is a traditional clock-face style, but IV is the standard form.

Embed this tool on your website

Add the free Roman Numeral Converter to your blog or website. Paste the code into your page’s HTML; the tool runs in your visitors’ browsers and stays up to date automatically. Please keep the credit line below the tool.

Free to use on any website. The tool runs inside an iframe served from viptools.pk; nothing your visitors type is sent to your site or ours. Preview the embedded version.

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