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Roman Numeral Converter

Convert canonical Roman numerals and integers from 1 to 3999.

Roman Numeral Converter
Local input
Output
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Processed locally in your browserNo input history is saved
About this tool

Made for the task at hand.

Translate standard subtractive Roman notation without approximations. The converter accepts canonical forms from I through MMMCMXCIX and rejects ambiguous or out-of-range values.

How to use

  1. Enter an integer or a Roman numeral.
  2. Choose Number → Roman or Roman → Number.
  3. Copy the validated conversion result.
Your work stays yours.
Tool inputs are processed locally in your browser and are never sent to KitVerse servers. Clear the workspace when using a shared device.
Common questions
Why is the largest value 3999?

Standard notation without overlines represents 1–3999; 3999 is MMMCMXCIX. Larger extension systems are intentionally not inferred.

Are noncanonical forms such as IIII accepted?

No. Use canonical subtractive notation such as IV for 4 so every accepted numeral has one standard interpretation.

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