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Roman Numeral Converter

Convert decimal numbers from 1 to 3999 and modern canonical Roman numerals bidirectionally in your browser.

Input

Private by design: your values never leave your device.

Output

Decimal value

2026

Roman uppercase

MMXXVI

Roman lowercase

mmxxvi

Canonical

yes

Breakdown and explanation

Tokens

M + M + X + X + V + I

Values

1000 + 1000 + 10 + 10 + 5 + 1

Place values

2000 + 20 + 6

Symbol statistics

M:2 · X:2 · V:1 · I:1

Symbol table and rules

C = 100

D = 500

I = 1

L = 50

M = 1000

V = 5

X = 10

Modern canonical forms from I to MMMCMXCIX are supported. Valid subtractive pairs are IV, IX, XL, XC, CD, and CM.

Good to know

The Roman numeral converter converts bidirectionally between decimal numbers and Roman numerals in the range 1 to 3999, directly in your browser. Input is checked against modern canonical rules — for non-canonical notation, the tool suggests the correct modern form.

Typical searches include convert Roman numerals, XIV to 14, and write a year in Roman numerals. Calculation runs locally in the browser. Modern canonical notation differs from historical variants; negative numbers, zero, and overline notation for very large numbers are not supported.

Typical use cases

Convert year numbers for engravings or titles

Convert a year such as 2026 into Roman numerals, for example for engravings, film titles, or monument inscriptions.

Decode Roman numerals from texts

Convert Roman numerals from historical texts, chapter numbering, or clocks into decimal numbers.

Tips for better results

Let non-canonical notation be corrected

For non-modern-canonical input, the tool suggests the correct form, which you can apply directly.

Note the 1 to 3999 range limit

The tool only supports values from 1 to 3999, since modern canonical Roman notation has no unambiguous standard representation for larger numbers.

How it works

Step by step

  1. 1

    Enter a decimal or Roman numeral

    Enter a decimal number from 1 to 3999 or a Roman numeral.

  2. 2

    View the result and breakdown

    See the converted result along with the explanation of the breakdown and place values.

  3. 3

    Copy the result

    Copy the value in uppercase or lowercase.

Features

Bidirectional conversion

Convert from decimal to Roman numeral and back.

Local conversion

Calculation happens directly in the browser, without transmission to a server.

Breakdown and symbol statistics

See the breakdown into place values and a statistic of the symbols used.

Frequently asked questions

What number range is supported?

1 to 3999. Negative numbers, zero, and overline notation for larger numbers are not supported.

Are my inputs uploaded?

No. Conversion runs entirely locally in the browser.

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