What range is supported?

Standard Roman numerals from 1 to 3,999.

We enforce standard forms (e.g., IV not IIII).

Roman Numerals ⇄ Integer

Convert both ways (1–3999) with format validation.

Last updated: 2025-09-05

Integer (1–3999)Roman numerals

Rules: I, V, X, L, C, D, M. I before V/X; X before L/C; C before D/M.

Standard form up to 3,999 is supported.

Informational only; verify critical results independently.