Cubestack

Roman Numeral Converter

Free Roman numeral converter — convert numbers to Roman numerals and Roman numerals to numbers (1 to 3999), with the year and a step-by-step breakdown.

M (1000) + M (1000) + X (10) + X (10) + V (5) + I (1) = 2026

Symbols

  • I

    1

  • V

    5

  • X

    10

  • L

    50

  • C

    100

  • D

    500

  • M

    1000

A smaller symbol before a larger one is subtracted: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900. No symbol repeats more than three times in a row.

What is the Roman Numeral Converter?

Roman numerals use the letters I, V, X, L, C, D and M to write numbers. They still appear on clocks, book chapters, film credits and event names. This converter works both ways and checks the numeral is written correctly.

How to use it

  1. 1

    Type a number or numeral

    The other box updates.

  2. 2

    Read the breakdown

    Below the boxes.

Features

  • Two-way

    Type in either box.

  • Strict checking

    Rejects non-standard forms like IIII or IC.

  • Breakdown

    See how the numeral adds up.

Popular uses

  • Years

    MMXXVI for 2026.

  • Homework

    Learn and check numerals.

  • Design

    Tattoos, watch faces and invitations.

Frequently asked questions

Why only up to 3999?

Standard Roman numerals have no symbol above M (1000), so 3999 (MMMCMXCIX) is the largest.

What is 2026 in Roman numerals?

MMXXVI.

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