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Roman Numeral Converter

Unit Converters

Arabic numbers to Roman numerals and back (1-3999)

Quick Answer

Roman Numeral Converter: Arabic numbers to Roman numerals and back (1-3999). I=1 V=5 X=10 L=50 C=100 D=500 M=1000.

Roman numeralMMXXIV
Value2024

Decomposition

  1. 12024 = M×2=2000 + X×2=20 + IV=4
  2. 2Combine symbols from largest to smallest: MMXXIV

Symbol reference

IVXLCDM
1510501005001000
A smaller symbol before a larger one subtracts: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900. Standard form caps at 3999 (MMMCMXCIX) — larger numbers need an overline (vinculum). Clock faces traditionally write 4 as IIII instead of IV for visual symmetry with VIII.

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How to Use

  1. Pick units: switch source and target units in the Roman Numeral Converter.
  2. Enter a value: results sync both ways instantly — no convert button needed.
  3. Use the reference table: common conversions are listed for instant lookup.
  4. Copy the result: copy the converted value with its unit.

Key Points

  • Roman Numeral Converter is a free online unit conversion tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Arabic numbers to Roman numerals and back (1-3999).
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Roman numerals

I=1 V=5 X=10 L=50 C=100 D=500 M=1000
Subtractive pairs: IV=4 IX=9 XL=40 XC=90 CD=400 CM=900
A symbol repeats at most 3 times; standard range 1–3999
Example: 2024 = MMXXIV; 1999 = MCMXCIX

FAQ

How do I use the Roman Numeral Converter?
Open the page and fill in the input fields — results update automatically. Arabic numbers to Roman numerals and back (1-3999).
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on SI conversion factors and international standards. Last updated: 2025-07

Authoritative sources:

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Roman Numeral Converter[EB/OL]. https://www.yijiansuan.com/en/c/convert/roman-numeral

Results provided by this tool are for reference only and do not constitute professional advice.